Toyota Tundra Service Manual: EVAP System

Toyota Tundra Service Manual / Engine, Hybrid System / 1ur-fe Engine Control / Sfi System / EVAP System

RELATED DTCS

DTC Code	Monitoring Item	See page
P043E	Reference orifice clogged (built into canister pump module)
P043F	Reference orifice high-flow (built into canister pump module)
P0441	Purge VSV (Vacuum Switching Valve) stuck closed Purge VSV stuck open Purge flow
P0451	Canister pressure sensor (built into canister pump module) noise Canister pressure sensor (built into canister pump module) signal becomes fixed/flat
P0452	Canister pressure sensor (built into canister pump module) voltage low
P0453	Canister pressure sensor (built into canister pump module) voltage high
P0455	EVAP gross leak
P0456	EVAP small leak
P2401	Leak detection pump stuck OFF (built into canister pump module)
P2402	Leak detection pump stuck ON (built into canister pump module)
P2419	Vent valve stuck closed (built into canister pump module)
P2420	Vent valve stuck open (vent) (built into canister pump module)
P2610	Soak timer (built into ECM)

If any EVAP system DTCs are stored, the malfunctioning area can be determined using the table below.

NOTICE:

If the reference pressure difference between the first and second checks is greater than the specification, all the DTCs relating to the reference pressure (P043E, P043F, P2401, P2402 and P2419) are stored.

DESCRIPTION

Text in Illustration

*1	Purge VSV	*2	Purge Line Hose (to Intake Manifold)
*3	Purge Line Hose (from Canister)	*4	Canister Pump Module - Canister Pressure Sensor - Leak Detection Pump - Vent Valve
*5	Canister Assembly	*6	Fuel Tank Inlet Pipe Sub-assembly (Canister Filter)
*7	Fuel Tank Cap Assembly	*8	Fuel Tank
*9	Purge Line	*10	Bleeding Pipe
*a	Location of EVAP (Evaporative Emission) System	-	-

HINT:

The canister pressure sensor, the leak detection pump and the vent valve are built into the canister pump module.

Text in Illustration

*1	Canister Pump Module	*2	Intake Manifold
*3	Purge VSV	*4	Throttle Valve
*5	Canister Assembly	*6	Cut-off Valve
*7	Fuel Tank	*8	Air Cleaner
*9	ECM	*10	Fuel Tank Inlet Pipe Sub-assembly (Canister Filter)
*11	Soak Timer	*12	Roll-over Valve
*13	Fuel Tank Cap Assembly	-	-
*a	EVAP System Circuit	-	-

NOTICE:

In this vehicle's EVAP system, turning the vent valve ON does not seal off the EVAP system. To check for leaks in the EVAP system, disconnect the air inlet vent hose and apply pressure from the side of the canister exposed to the atmosphere.

While the engine is running, if a predetermined condition (closed loop, etc.) is met, the purge VSV is opened by the ECM and stored fuel vapors in the canister are purged into the intake manifold. The ECM changes the duty cycle of the purge VSV to control purge flow volume.

The purge flow volume is also determined by the intake manifold pressure. Atmospheric pressure is applied to the canister through the vent valve to ensure that the purge flow is maintained when the negative pressure (vacuum) is applied to the canister.

The following two monitors run to confirm the appropriate EVAP system operation.

1. Key-off monitor

This monitor checks for EVAP (Evaporative Emission) system leaks and canister pump module malfunctions. The monitor starts 5 hours* after the ignition switch is turned off. At least 5 hours are required for the fuel to cool down to stabilize the EVAP pressure, thus making the EVAP system monitor more accurate.

The leak detection pump creates negative pressure (vacuum) in the EVAP system and the pressure is measured. Finally, the ECM monitors for leaks from the EVAP system, and malfunctions in both the canister pump module and purge VSV, based on the EVAP pressure.

HINT:

*: If the engine coolant temperature is not below 35°C (95°F) 5 hours after the ignition switch is turned off, the monitor check starts 2 hours later. If it is still not below 35°C (95°F) 7 hours after the ignition switch is turned off, the monitor check starts 2.5 hours later.

2. Purge flow monitor

The purge flow monitor consists of 2 monitors. The 1st monitor is conducted every time and the 2nd monitor is activated if necessary.

The 1st monitor
While the engine is running and the purge VSV (Vacuum Switching Valve) is ON (open), the ECM monitors the purge flow by measuring the EVAP pressure change. If negative pressure is not created, the ECM begins the 2nd monitor.
The 2nd monitor
The vent valve is turned OFF (open) and the EVAP pressure is measured. If the variation in the pressure is less than 0.4 kPa-g (3.0 mmHg-g), the ECM interprets this as the purge VSV being stuck closed, and then illuminates the MIL and stores DTC P0441 (2 trip detection logic).

Atmospheric pressure check:

In order to ensure reliable malfunction detection, the variation between the atmospheric pressures, before and after conduction of the purge flow monitor, is measured by the ECM.

Text in Illustration

*1	ECM	*2	Soak Timer
*3	Purge VSV (On)	*4	Fuel Tank Cap Assembly
*5	Canister Filter	*6	Fuel Tank
*7	Leak Detection Pump (Off)	*8	Canister Pressure Sensor
*9	Reference Orifice (0.02 Inches)	*10	Vent Valve (Off)
*11	Canister Pump Module	*12	Canister Assembly
*a	EVAP Purge Flow	*b	to Intake Manifold

Component	Operation
Canister Assembly	Contains activated charcoal to absorb EVAP (Evaporative Emissions) generated in fuel tank.
Cut-off valve	Located in fuel tank. Valve floats and closes when fuel tank 100% full.
Purge VSV (Vacuum Switching Valve)	Opens or closes line between canister and intake manifold. ECM uses purge VSV to control EVAP purge flow. In order to discharge EVAP absorbed by canister to intake manifold, ECM opens purge VSV. EVAP discharge volume to intake manifold controlled by purge VSV duty cycle (time current is flowing) (Open: ON; Closed: OFF).
Roll-over valve	Located in fuel tank. Valve closed by its own weight when vehicle overturns to prevent fuel from spilling out.
Soak timer	Built into ECM. To ensure accurate EVAP monitor, measures 5 hours (+/-15 min.) after ignition switch turned off. This allows fuel to cool down, stabilizing EVAP pressure. When approximately 5 hours have elapsed, ECM activates (refer to fig. 3).
Canister pump module	Consists of (a) to (d) below. Canister pump module cannot be disassembled.
(a) Vent valve	Vents and closes EVAP system. When ECM turns valve ON, EVAP system closed. When ECM turns valve OFF, EVAP system vented. Negative pressure (vacuum) created in EVAP system to check for EVAP leaks by closing purge VSV, turning on vent valve (closed) and operating leak detection pump (refer to fig. 1).
(b) Canister pressure sensor	Indicates pressure as voltages. ECM supplies regulated 5 V to canister pressure sensor, and uses feedback from sensor to monitor EVAP system pressure (refer to fig. 2).
(c) Leak detection pump	Creates negative pressure (vacuum) in EVAP system for leak check.
(d) Reference orifice	Has opening with 0.02-inch diameter. Vacuum produced through orifice by closing purge VSV, turning off vent valve and operating leak detection pump to monitor reference pressure. Reference pressure used to detect small leak of EVAP.

Text in Illustration

*1	Canister	*2	Reference Orifice (0.02 Inches)
*3	Canister Pressure Sensor	-	-
*a	Canister Pump Module (fig. 1)	*b	Airflow
*c	Condition: Purge Flow	*d	Condition: Leak Check
*e	Vent Valve: Off (Vent)	*f	to Canister Filter (Atmosphere)
*g	Leak Detection Pump: Off	*h	Vent Valve: on (closed)
*i	Leak Detection Pump: on	-	-

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

The Techstream is required to conduct the following diagnostic troubleshooting procedure.

HINT:

Using the Techstream monitor results enables the EVAP (Evaporative Emission) system to be checked.
Read freeze frame data using the Techstream. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

CONFIRMATION DRIVING PATTERN

HINT:

After a repair, check Monitor Status by performing the Key-off Monitor Confirmation and Purge Flow Monitor Confirmation described below.

1. Key-off monitor confirmation

(a) Preconditions

The monitor will not run unless:

The vehicle has been driven for 10 minutes or more (in a city area or on a freeway).
The fuel tank is less than 90% full.
The elevation is less than 2432 m (8000 ft.).
The engine coolant temperature is between 4.4°C and 35°C (40°F and 95°F).
The intake air temperature is between 4.4°C and 35°C (40°F and 95°F).
The vehicle remains stationary (the vehicle speed is 0 mph [0 km/h]).

(b) Monitor Conditions

Allow the engine to idle for at least 5 minutes.
Turn the ignition switch off and wait for 5 hours (7 or 9.5 hours).
HINT:

Do not start the engine until checking Monitor Status. If the engine is started, the steps described above must be repeated.

Connect the Techstream to the DLC3.
Turn the ignition switch to ON and turn the Techstream on.
Turn the Techstream on.
Enter the following menus: Powertrain / Engine and ECT / Monitor / Evaporative System.
Check the Monitor Status displayed on the Techstream.
HINT:

If INCMP (incomplete) is displayed, the monitor is not complete. Make sure that the preconditions have been met, and then perform the operations listed under Monitor Conditions again.

2. Purge flow monitor confirmation (P0441)

HINT:

Perform this monitor confirmation after the Key-off Monitor Confirmation shows COMPL (complete).

(a) Preconditions

The monitor will not run unless:

The vehicle has been driven for 10 minutes or more (in a city area or on a freeway).
The engine coolant temperature is between 4.4°C and 35°C (40°F and 95°F).
The intake air temperature is between 4.4°C and 35°C (40°F and 95°F).

(b) Monitor Conditions

Release the pressure from the fuel tank by removing and reinstalling the fuel tank cap.
Warm the engine up until the engine coolant temperature is higher than 75°C (167°F).
Increase the engine speed to 3000 rpm once.
Allow the engine to idle and turn the A/C on for 1 minute.

Turn the ignition switch off (if ON or if the engine is running).
Connect the Techstream to the DLC3.
Turn the ignition switch to ON and turn the Techstream on.
Enter the following menus: Powertrain / Engine and ECT / Monitor.
Check the Monitor Status displayed on the Techstream.
HINT:

If INCMP (incomplete) is displayed, the monitor is not complete. Make sure that the preconditions have been met, and then perform the operations listed under Monitor Conditions again

MONITOR RESULT

Refer to Checking Monitor Status (See page ).

PROCEDURE

1.	CONFIRM DTC

(a) Turn the ignition switch off and wait for 10 seconds.

(b) Turn the ignition switch to ON.

(d) Connect the Techstream to the DLC3.

(e) Turn the ignition switch to ON and turn the Techstream on.

(f) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

(g) Confirm DTCs and freeze frame data.

If any EVAP system DTCs are stored, the malfunctioning area can be determined using the table below.

NOTICE:

2.	PERFORM EVAPORATIVE SYSTEM CHECK (AUTOMATIC MODE)

NOTICE:

The Evaporative System Check (Automatic Mode) consists of 6 steps performed automatically by the Techstream. It takes a maximum of approximately 24 minutes.
Do not perform the Evaporative System Check when the fuel tank is more than 90% full because the cut-off valve may be closed. If the cut-off valve is closed, the fuel tank leak check is not possible.
Do not run the engine during this operation.
When the temperature of the fuel is 35°C (95°F) or higher, a large amount of vapor forms and any check results become inaccurate. When performing the Evaporative System Check, keep the fuel temperature below 35°C (95°F).

(a) Clear the DTCs (See page ).

(b) Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode.

(c) After Evaporative System Check is completed, check for pending DTCs by entering the following menus: Powertrain / Engine and ECT / Trouble Codes.

HINT:

If no pending DTCs are displayed, perform Monitor Confirmation (see "Diagnostic Help" menu). After this confirmation, check for pending DTCs. If no DTCs are displayed, the EVAP system is normal.

3.	PERFORM EVAPORATIVE SYSTEM CHECK (MANUAL MODE)

NOTICE:

In the Evaporative System Check (Manual Mode), perform the series of 6 Evaporative System Check steps manually using the Techstream.
Do not perform the Evaporative System Check when the fuel tank is more than 90% full because the cut-off valve may be closed. If the cut-off valve is closed, the fuel tank leak check is not possible.
Do not run the engine during this operation.
When the temperature of the fuel is 35°C (95°F) or higher, a large amount of vapor forms and any check results become inaccurate. When performing the Evaporative System Check, keep the fuel temperature below 35°C (95°F).

(a) Clear the DTCs (See page ).

(b) Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Manual Mode.

4.	PERFORM EVAPORATIVE SYSTEM CHECK (STEP 1/6)

(a) Check the EVAP pressure in step 1/6.

Result

DTC*1	Test Result	Suspected Trouble Area	Proceed to
-	Virtually no variation in EVAP pressure	Not yet determined	A
P0451	EVAP pressure fluctuates by 0.3 kPa-g (2.25 mmHg-g) or more	Canister pressure sensor noise	B
(P0452 or P0453)*2	EVAP pressure is below 42.1 kPa-a (315.85 mmHg-a) or 123.8 kPa-a (928.28 mmHg-a) or more EVAP pressure deviates 10 kPa (75 mmHg) from actual atmosphere pressure *3	Canister pressure sensor or its circuit has malfunction	C

*1: These DTCs are already stored in the ECM when the vehicle arrives and are confirmed in the Confirm DTC procedures above.
*2: If the canister pressure sensor circuit has an open or short, DTC P0452 or P0453 is stored 0.5 seconds after the ignition switch is turned to ON.

HINT:

*3: Canister pressure sensor standard output range is 70 to 110 kPa-a (525 to 825 mmHg-a). This varies by weather.

GO TO STEP 38

GO TO STEP 12

5.	PERFORM EVAPORATIVE SYSTEM CHECK (STEP 1/6 TO 2/6)

(a) Check the EVAP pressure in steps 1/6 and 2/6.

Result

DTC*	Test Result	Suspected Trouble Area	Proceed to
-	Virtually no variation in EVAP pressure during step 1/6. Then decreases to reference pressure.	Not yet determined	A
P2402	Small difference between EVAP pressures during steps 1/6 and 2/6	Leak detection pump stuck ON	B

*: These DTCs are already stored in the ECM when the vehicle arrives and are confirmed in the Confirm DTC procedures above.

HINT:

The first reference pressure is the value determined in step 2/6.

GO TO STEP 33

6.	PERFORM EVAPORATIVE SYSTEM CHECK (STEP 2/6)

HINT:

Make a note of the pressures observed in steps (a) and (b) below.

(a) Check the EVAP pressure 4 seconds after the leak detection pump is activated*.
*: The leak detection pump begins to operate as step 1/6 finishes and step 2/6 starts.

(b) Check the EVAP pressure again when it has stabilized. This pressure is the reference pressure. Result

DTC*	Test Result	Suspected Trouble Area	Proceed to
-	EVAP pressure in step (b) between -4.85 kPa-g and -1.057 kPa-g (-36.4 mmHg-g and -7.93 mmHg-g)	Not yet determined	A
P043F and P2401	EVAP pressure in step (b) -1.057 kPa-g (-7.93 mmHg-g) or higher	Reference orifice high-flow Leak detection pump stuck OFF	B
P043E	EVAP pressure in step (b) below -4.85 kPa-g (-36.4 mmHg-g)	Reference orifice clogged	C
P2419	EVAP pressure in step (a) higher than -0.25 kPa-g (-1.88 mmHg-g)	Vent valve stuck closed Leak detection pump performance deteriorates Leak detection pump circuit malfunctioning (large resistance exists in the circuit)	D

*: These DTCs are already stored in the ECM when the vehicle arrives and are confirmed in the Confirm DTC procedures above.

GO TO STEP 11

GO TO STEP 38

GO TO STEP 13

7.	PERFORM EVAPORATIVE SYSTEM CHECK (STEP 2/6 TO 3/6)

(a) Check the EVAP pressure increase in step 3/6.

Result

DTC*	Test Result	Suspected Trouble Area	Proceed to
-	EVAP pressure increases by 0.3 kPa-g (2.25 mmHg-g) or more within 10 seconds of proceeding from step 2/6 to step 3/6	Not yet determined	A
P2420	No variation in EVAP pressure despite proceeding from step 2/6 to step 3/6	Vent valve stuck open (vent) Canister (charcoal filter inside canister) clogged	B
P0451	No variation in EVAP pressure during steps 1/6 through 3/6	Canister pressure sensor output value stuck Vent valve broken (valve split in two) Leak detection pump performance deteriorates Leak detection pump circuit malfunctioning (large resistance exists in the circuit)	C

*: These DTCs are already stored in the ECM when the vehicle arrives and are confirmed in the Confirm DTC procedures above.

GO TO STEP 27

GO TO STEP 15

8.	PERFORM EVAPORATIVE SYSTEM CHECK (STEP 3/6)

(a) Wait until the EVAP pressure change over 40 seconds is less than 0.1 kPa-g (0.75 mmHg-g).

(b) Measure the EVAP pressure and record it.

HINT:

A few minutes are required for the EVAP pressure to become stable. When there is little fuel in the fuel tank, it may take up to 15 minutes.

9.	PERFORM EVAPORATIVE SYSTEM CHECK (STEP 4/6)

(a) Check the EVAP pressure in step 4/6.

Result

DTC*1	Test Result	Suspected Trouble Area	Proceed to
-	EVAP pressure increases by 0.3 kPa-g (2.25 mmHg-g) or more within 10 seconds of proceeding from step 3/6 to step 4/6	Not yet determined	A
P0441*2	EVAP pressure increases by 0.3 kPa-g (2.25 mmHg-g) or more within 10 seconds of proceeding from step 3/6 to step 4/6	Purge VSV Purge VSV circuit Problems in EVAP hose between purge VSV and intake manifold Problems in EVAP hose between canister and purge VSV ECM	B
P0441	Variation in EVAP pressure less than 0.3 kPa-g (2.25 mmHg-g) for 10 seconds after proceeding from step 3/6 to step 4/6	Purge VSV stuck closed Purge VSV circuit Canister (charcoal filter inside canister) clogged Problems in EVAP hose between purge VSV and intake manifold Problems in EVAP hose between canister and purge VSV ECM	C

*1: These DTCs are already stored in the ECM when the vehicle arrives and are confirmed in the Confirm DTC procedures above.
*2: This result suggests that due to purge line blockage or purge VSV malfunction, the DTC was stored by the purge flow monitor while the engine was running, or that key-off monitor test result were nearly borderline values.

GO TO STEP 22

GO TO STEP 17

10.	PERFORM EVAPORATIVE SYSTEM CHECK (STEP 5/6)

(a) Check the EVAP pressure in step 5/6.

(b) Compare the EVAP pressure from step 3/6 and the second reference pressure (step 5/6).

Result

DTC*	Test Result	Suspected Trouble Area	Proceed to
-	EVAP pressure (step 3/6) lower than second reference pressure (step 5/6)	Not yet determined (no leakage from EVAP system)	A
P0441 and P0455	EVAP pressure (step 3/6) higher than [second reference pressure (step 5/6) x 0.2]	Purge VSV stuck open EVAP gross leak	B
P0456	EVAP pressure (step 3/6) higher than second reference pressure (step 5/6)	EVAP small leak	B

*: These DTCs are already stored in the ECM when the vehicle arrives and are confirmed in the Confirm DTC procedures above.

GO TO STEP 43

GO TO STEP 17

11.	PERFORM EVAPORATIVE SYSTEM CHECK (STEP 3/6)

(a) Check the EVAP pressure in step 3/6.

Result

DTC*	Test Result	Suspected Trouble Area	Proceed to
P043F	EVAP pressure less than [reference pressure] measured in step 2/6	Reference orifice high-flow	A
P2401	EVAP pressure almost same as [reference pressure] measured in step 2/6	Leak detection pump stuck OFF	B

*: These DTCs are already stored in the ECM when the vehicle arrives and are confirmed in the Confirm DTC procedures above.

HINT:

The first reference pressure is the value determined in step 2/6.

GO TO STEP 38

GO TO STEP 31

12.	INSPECT CANISTER PUMP MODULE (CANISTER PRESSURE SENSOR CIRCUIT)

(a) Check the canister pressure sensor circuit, referring to DTC P0451 canister pressure sensor circuit inspection procedure (See page ).

GO TO STEP 49

13.	INSPECT CANISTER PUMP MODULE (VENT VALVE OPERATION)

(a) Turn the ignition switch off.

(b) Disconnect the R12 canister pump module connector.

(d) Touch the canister pump module to confirm the vent valve operation.

Result

Condition	Tester Result	Suspected Trouble Area	Proceed to
Apply battery voltage to terminals VLVB and VGND	Operating	Wire harness or connector between vent valve and ECM Leak detection pump performance deteriorates Leak detection pump circuit malfunctioning (large resistance exists in the circuit) ECM	A
Apply battery voltage to terminals VLVB and VGND	Not operating	Vent valve	B

Text in Illustration

*a	Component without harness connected (Canister Pump Module)

GO TO STEP 38

14.	CHECK HARNESS AND CONNECTOR (ECM - CANISTER PUMP MODULE)

(a) Disconnect the ECM connector.

(b) Disconnect the canister pump module connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A24-30 (VPMP) - R12-1 (VGND)	Always	Below 1 Ω
A24-30 (VPMP) or R12-1 (VGND) - Body ground	Always	10 kΩ or higher

Result

Result	Suspected Trouble Area	Proceed to
OK	Leak detection pump performance deteriorates Leak detection pump circuit malfunctioning (large resistance exists in the circuit) ECM	A
NG	Wire harness or connector between ECM and canister pump module	B

GO TO STEP 40

15.	CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - BODY GROUND)

(a) Disconnect the canister pump module connector.

(b) Measure the resistance according to the value(s) in the table below.

Result

Tester Connection	Condition	Specified Condition	Suspected Trouble Area	Proceed to
R12-4 (MGND) - Body ground	Always	Below 1 Ω	Canister pump module Wire harness or connector between canister pump module and ECM ECM	A
R12-4 (MGND) - Body ground	Always	10 kΩ or higher	Wire harness or connector between canister pump module and body ground	B

GO TO STEP 40

16.	CHECK HARNESS AND CONNECTOR (ECM - CANISTER PUMP MODULE)

(a) Disconnect the canister pump module connector.

(b) Disconnect the ECM connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A24-49 (MPMP) - R12-3 (MTRB)	Always	Below 1 Ω
A24-49 (MPMP) or R12-3 (MTRB) - Body ground	Always	10 kΩ or higher

Result

Result	Suspected Trouble Area	Proceed to
OK	Canister pump module ECM	A
NG	Wire harness or connector between ECM and canister pump module	B

GO TO STEP 45

GO TO STEP 40

17.	PERFORM ACTIVE TEST USING TECHSTREAM (PURGE VSV)

(a) Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the VSV for EVAP Control.

(b) Disconnect the hose (connected to the canister) from the purge VSV.

(d) Using the Techstream, turn off the purge VSV (Activate the VSV for EVAP Control: OFF).

(e) Use your finger to confirm that the purge VSV has no suction.

(f) Using the Techstream, turn on the purge VSV (Activate the VSV for EVAP Control: ON).

(g) Use your finger to confirm that the purge VSV has suction.

Result

Test Result	Suspected Trouble Area	Proceed to
No suction when purge VSV turned OFF, and suction applied when turned ON	Blockage in the purge line is considered (based on result of step 9): Problems with EVAP hose between canister and purge VSV Canister (charcoal filter inside canister) clogged ECM	A
	Leakage is considered (based on result of step 10): Fuel cap Leakage from EVAP line, fuel tank, or canister assembly	B
Suction applied when purge VSV turned OFF	Purge VSV stuck open	C
No suction when purge VSV turned ON	Purge VSV stuck closed Problems with EVAP hose between purge VSV and intake manifold	D

Text in Illustration

*1	Purge VSV
*2	Hose (to Canister)

GO TO STEP 20

GO TO STEP 21

GO TO STEP 23

18.	INSPECT EVAP HOSE (PURGE VSV - CANISTER)

(a) Check for blockages in the EVAP purge line between the purge VSV and canister.

OK:

No blockages in the EVAP purge line between the purge VSV and canister.

GO TO STEP 44

19.	INSPECT CANISTER ASSEMBLY (CHARCOAL FILTER INSIDE CANISTER)

(a) Check for filter blockage in the canister assembly (See page ).

OK:

No blockages in the canister assembly.

GO TO STEP 47

GO TO STEP 48

20.	CHECK FUEL TANK CAP ASSEMBLY

(a) Check that the fuel tank cap is correctly installed and confirm that the fuel tank cap meets OEM specifications.

(b) Tighten the fuel tank cap firmly (only one click sound is heard).

HINT:

If an EVAP tester is available, check the fuel tank cap using the tester.

Remove the fuel tank cap and install it to a fuel tank cap adapter.
Connect an EVAP tester pump hose to the adapter, and pressurize the fuel tank cap to between 3.2 and 3.7 kPa (24 and 28 mmHg) using an EVAP tester pump.
Seal the adapter and wait for 2 minutes.
Check the pressure. If the pressure is 2 kPa (15 mmHg) or higher, the fuel tank cap is normal.

Result

Test Result	Suspected Trouble Area	Proceed to
Fuel tank cap correctly installed	-	A
Fuel tank cap loose	Fuel tank cap improperly installed Defective fuel tank cap Fuel tank cap does not meet OEM specifications	B
Defective fuel tank cap	-	B
No fuel tank cap	-	C

GO TO STEP 37

GO TO STEP 35

GO TO STEP 36

21.	INSPECT PURGE VSV

(a) Turn the ignition switch off.

(b) Disconnect the purge VSV connector.

(d) Start the engine.

(e) Use your finger to confirm that the purge VSV has no suction.

Result

Test Result	Suspected Trouble Area	Proceed to
No suction	Wire harness or connector between purge VSV and ECM (short to ground) ECM	A
Suction applied	Purge VSV	B

Text in Illustration

*1	Purge VSV
*2	Hose (to Canister)

GO TO STEP 26

GO TO STEP 39

22.	INSPECT EVAP HOSE (PURGE VSV - CANISTER)

(a) Check for blockages in the EVAP purge line between the purge VSV and canister.

OK:

No blockages in the EVAP purge line between the purge VSV and canister.

GO TO STEP 44

23.	CHECK EVAP HOSE (PURGE VSV - INTAKE MANIFOLD)

(a) Disconnect the hose (connected to the intake manifold) from the purge VSV.

(b) Start the engine.

Result

Test Result

Suspected Trouble Area

Proceed to

Suction applied

EVAP hose between purge VSV and intake manifold normal

Purge VSV
Purge VSV power source
Wire harness or connector between purge VSV and ECM

No suction

Intake manifold port
EVAP hose between purge VSV and intake manifold

Text in Illustration

*1	Purge VSV
*2	Hose (to Intake Manifold)

GO TO STEP 34

24.	INSPECT PURGE VSV

(a) Remove the purge VSV.

(b) Apply battery voltage to the terminals of the purge VSV.

Result

Test Result

Condition

Suspected Trouble Area

Proceed to

Air flows

Battery voltage is applied to purge VSV terminals

Purge VSV normal

Purge VSV power source
Wire harness or connector between purge VSV and ECM

No air flow

Battery voltage is applied to purge VSV terminals

Purge VSV

Text in Illustration

*1	Purge VSV
*2	Port A
*3	Port B

GO TO STEP 39

25.	CHECK HARNESS AND CONNECTOR (POWER SOURCE OF PURGE VSV)

(a) Disconnect the purge VSV connector.

(b) Turn the ignition switch to ON.

Tester Connection

Switch Condition

Specified Condition

Suspected Trouble Area

Proceed to

D29-1 - Body ground

Ignition switch ON

11 to 14 V

Purge VSV power source normal

Wire harness or connector between purge VSV and ECM

Ignition switch ON

Other than result above

Wire harness or connectors between purge VSV and battery

Text in Illustration

*a	Front view of wire harness connector (to Purge VSV)

GO TO STEP 40

26.	CHECK HARNESS AND CONNECTOR (PURGE VSV - ECM)

(a) Disconnect the ECM connector.

(b) Disconnect the purge VSV connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
D74-63 (PRG) - D29-2	Always	Below 1 Ω
D74-63 (PRG) or D29-2 - Body ground	Always	10 kΩ or higher

GO TO STEP 47

GO TO STEP 40

27.	INSPECT CANISTER PUMP MODULE (POWER SOURCE FOR VENT VALVE)

(a) Turn the ignition switch off.

(b) Disconnect the canister pump module connector.

(d) Measure the voltage according to the value(s) in the table below.

Tester Connection	Switch Condition	Specified Condition	Suspected Trouble Area	Proceed to
R12-5 (VLVB) - Body ground	Ignition switch ON	11 to 14 V	Wire harness or connector between vent valve and ECM Vent valve Canister (charcoal filter inside canister) clogged ECM	A
R12-5 (VLVB) - Body ground	Ignition switch ON	Below 3 V	Power source wire harness of vent valve	B

Text in Illustration

*a	Front view of wire harness connector (to Canister Pump Module)

GO TO STEP 40

28.	INSPECT CANISTER PUMP MODULE (VENT VALVE OPERATION)

(a) Turn the ignition switch off.

(b) Disconnect the R12 canister pump module connector.

(d) Touch the canister pump module to confirm the vent valve operation.

Result

Condition	Tester Result	Suspected Trouble Area	Proceed to
Apply battery voltage to terminals VLVB and VGND	Operating	Wire harness or connector between vent valve and ECM Canister (charcoal filter inside canister) clogged ECM	A
Apply battery voltage to terminals VLVB and VGND	Not operating	Vent valve	B

Text in Illustration

*a	Component without harness connected (Canister Pump Module)

GO TO STEP 38

29.	CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM)

(a) Disconnect the ECM connector.

(b) Disconnect the canister pump module connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A24-30 (VPMP) - R12-1 (VGND)	Always	Below 1 Ω
A24-30 (VPMP) or R12-1 (VGND) - Body ground	Always	10 kΩ or higher

Result

Result	Suspected Trouble Area	Proceed to
OK	Canister (charcoal filter inside canister) clogged ECM	A
NG	Wire harness or connector between ECM and canister pump module	B

GO TO STEP 40

30.	INSPECT CANISTER ASSEMBLY (CHARCOAL FILTER INSIDE CANISTER)

(a) Check for filter blockage in the canister assembly (See page ).

OK:

No blockages in the canister assembly.

GO TO STEP 47

GO TO STEP 48

31.	CHECK TERMINAL VOLTAGE (CANISTER PUMP MODULE)

(a) Turn the ignition switch off.

(b) Disconnect the canister pump module connector.

(d) Measure the voltage according to the value(s) in the table below.

Tester Connection	Condition	Test Result	Suspected Trouble Area	Proceed to
R12-3 (MTRB) - Body ground	Ignition switch ON	9 to 14 V	Wire harness or connector between leak detection pump and body ground Leak detection pump	A
R12-3 (MTRB) - Body ground	Ignition switch ON	Below 3 V	Wire harness or connector between leak detection pump and ECM ECM	B

Text in Illustration

*a	Front view of wire harness connector (to Canister Pump Module)

GO TO STEP 33

32.	CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - BODY GROUND)

(a) Turn the ignition switch off.

(b) Disconnect the canister pump module connector.

Tester Connection	Condition	Specified Condition	Suspected Trouble Area	Proceed to
R12-4 (MGND) - Body ground	Always	Below 1 Ω	Leak detection pump	A
R12-4 (MGND) - Body ground	Always	10 kΩ or higher	Wire harness or connector between canister pump module and body ground	B

GO TO STEP 38

GO TO STEP 40

33.	CHECK HARNESS AND CONNECTOR (ECM - CANISTER PUMP MODULE)

(a) Turn the ignition switch off.

(b) Disconnect the ECM connector.

(d) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A24-49 (MPMP) - R12-3 (MTRB)	Always	Below 1 Ω
A24-49 (MPMP) or R12-3 (MTRB) - Body ground	Always	10 kΩ or higher

Result

Result	Suspected Trouble Area	Proceed to
OK	ECM	A
NG	Wire harness or connector between ECM and canister pump module	B

GO TO STEP 47

GO TO STEP 40

34.	INSPECT INTAKE MANIFOLD (EVAP PURGE PORT)

(a) Stop the engine.

(b) Disconnect the EVAP hose from the intake manifold.

(d) Use your finger to confirm that the port of the intake manifold has suction.

Result

Test Result	Suspected Trouble Area	Proceed to
Suction applied	EVAP hose between intake manifold and purge VSV	A
No suction	Intake manifold	B

GO TO STEP 41

GO TO STEP 42

35.	CORRECTLY REINSTALL OR REPLACE FUEL TANK CAP ASSEMBLY

HINT:

When reinstalling the fuel tank cap, tighten it until a click sound is heard.
When replacing the fuel tank cap, use a fuel tank cap that meets OEM specifications and tighten it until a click sound is heard.

GO TO STEP 49

36.	REPLACE FUEL TANK CAP ASSEMBLY

HINT:

When replacing the fuel tank cap, use a fuel tank cap that meets OEM specifications and tighten it until a click sound is heard.

GO TO STEP 49

37.	LOCATE EVAP PART WHICH IS LEAKING

Text in Illustration

*1	EVAP Tester	*2	Adapter
*3	Canister Outlet Hose	-	-

(a) Disconnect the canister outlet hose.

(b) Connect an EVAP tester to the canister pump module with an adapter.

(d) Apply soapy water to the piping and connecting parts of the EVAP system.

(e) Look for areas where bubbles appear. Bubbles indicate the leak point.

(f) Repair or replace the leak point.

HINT:

Disconnect the hose between the canister and fuel tank from the canister. Block the canister side and conduct an inspection. In this way, the fuel tank can be excluded as an area suspected of causing fuel leaks.

GO TO STEP 49

38.	REPAIR CANISTER PUMP MODULE

(a) Replace the canister pump module (See page ).

NOTICE:

When replacing the canister pump module, check the canister pump module interior, canister interior and related pipes for water, fuel and other liquids. If liquids are present, check for disconnections and/or cracks in the following: 1) the pipe from the air inlet port to the canister pump module; 2) the canister filter; and 3) the fuel tank vent hose. If liquids are present in the canister interior, replace the canister and canister pump module together.
Check for filter blockage in the canister. If the charcoal filter inside the canister is clogged, replace the canister and canister pump module together.
Check for filter blockage in the canister filter. If the canister filter has blockages, replace the fuel tank inlet pipe sub-assembly.

Text in Illustration

*1	Fuel Tank	*2	Fuel Tank Vent Hose
*3	Canister Assembly	*4	Canister Pump Module - Canister Pressure Sensor - Leak Detection Pump - Vent Valve
*5	Fuel Tank Inlet Pipe Sub-assembly (Canister Filter)	*6	Canister Outlet Hose
*a	Inspection Area (check for disconnection and/or cracks)	-	-

GO TO STEP 49

39.	REPLACE PURGE VSV

(a) Replace the purge VSV (See page ).

GO TO STEP 49

40.	REPAIR OR REPLACE HARNESS OR CONNECTOR

GO TO STEP 49

41.	REPAIR OR REPLACE EVAP PURGE LINE (INTAKE MANIFOLD - PURGE VSV)

GO TO STEP 49

42.	INSPECT INTAKE MANIFOLD (EVAP PURGE PORT)

(a) Check that the EVAP purge port of the intake manifold is not clogged. If necessary, replace the intake manifold.

GO TO STEP 49

43.	REPAIR OR REPLACE PARTS AND COMPONENTS INDICATED BY OUTPUT DTCS

(a) Repair the malfunctioning areas indicated by the DTCs that had been confirmed when the vehicle was brought in.

GO TO STEP 49

44.	REPAIR OR REPLACE EVAP PURGE LINE (PURGE VSV - CANISTER)

GO TO STEP 49

45.	REPLACE CANISTER PUMP MODULE

(a) Replace the canister pump module (See page ).

NOTICE:

When replacing the canister pump module, check the canister pump module interior, canister interior and related pipes for water, fuel and other liquids. If liquids are present, check for disconnections and/or cracks in the following: 1) the pipe from the air inlet port to the canister pump module; 2) the canister filter; and 3) the fuel tank vent hose. If liquids are present in the canister interior, replace the canister and canister pump module together.
Check for filter blockage in the canister. If the charcoal filter inside the canister is clogged, replace the canister and canister pump module together.
Check for filter blockage in the canister filter. If the canister filter has blockages, replace the fuel tank inlet pipe sub-assembly.

Text in Illustration

*1	Fuel Tank	*2	Fuel Tank Vent Hose
*3	Canister Assembly	*4	Canister Pump Module - Canister Pressure Sensor - Leak Detection Pump - Vent Valve
*5	Fuel Tank Inlet Pipe Sub-assembly (Canister Filter)	*6	Canister Outlet Hose
*a	Inspection Area (check for disconnection and/or cracks)	-	-

46.	PERFORM EVAPORATIVE SYSTEM CHECK (AUTOMATIC MODE)

NOTICE:

The Evaporative System Check (Automatic Mode) consists of 6 steps performed automatically by the Techstream. It takes a maximum of approximately 24 minutes.
Do not perform the Evaporative System Check when the fuel tank is more than 90% full because the cut-off valve may be closed. If the cut-off valve is closed, the fuel tank leak check is not possible.
Do not run the engine during this operation.
When the temperature of the fuel is 35°C (95°F) or higher, a large amount of vapor forms and any check results become inaccurate. When performing an Evaporative System Check, keep the fuel temperature below 35°C (95°F).

(a) Clear the DTCs (See page ).

(b) Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode.

(c) After the Evaporative System Check is completed, check for pending DTCs by entering the following menus: Powertrain / Engine and ECT / Trouble Codes.

Result

Proceed to

EVAP system DTCs are output

DTC is not output

(Pending DTC is not output)

END

47.	REPLACE ECM

(a) Replace the ECM (See page ).

GO TO STEP 49

48.	REPLACE CANISTER ASSEMBLY

(a) Replace the canister assembly (See page ).

NOTICE:

When replacing the canister, check the canister pump module interior and related pipes for water, fuel and other liquids. If liquids are present, check for disconnections and/or cracks in the following: 1) the pipe from the air inlet port to the canister pump module; 2) the canister filter; and 3) the fuel tank vent hose.
Check for filter blockage in the canister filter. If the canister filter has blockages, replace the fuel tank inlet pipe sub-assembly.

Text in Illustration

*1	Fuel Tank	*2	Fuel Tank Vent Hose
*3	Canister Assembly	*4	Canister Pump Module - Canister Pressure Sensor - Leak Detection Pump - Vent Valve
*5	Fuel Tank Inlet Pipe Sub-assembly (Canister Filter)	*6	Canister Outlet Hose
*a	Inspection Area (check for disconnection and/or cracks)	-	-

49.	PERFORM EVAPORATIVE SYSTEM CHECK (AUTOMATIC MODE)

NOTICE:

The Evaporative System Check (Automatic Mode) consists of 6 steps performed automatically by the Techstream. It takes a maximum of approximately 24 minutes.
Do not perform the Evaporative System Check when the fuel tank is more than 90% full because the cut-off valve may be closed. If the cut-off valve is closed, the fuel tank leak check is not possible.
Do not run the engine during this operation.
When the temperature of the fuel is 35°C (95°F) or higher, a large amount of vapor forms and any check results become inaccurate. When performing an Evaporative System Check, keep the fuel temperature below 35°C (95°F).

(a) Clear the DTCs (See page ).

(b) Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode.

(c) After the Evaporative System Check is completed, check for pending DTCs by entering the following menus: Powertrain / Engine and ECT / Trouble Codes.

HINT:

If no pending DTCs are found, the repair has been successfully completed.

END

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