DESCRIPTION Refer to DTC P0401 (See page
 ). |
DTC No. | DTC Detection Condition |
Trouble Area | | P0403 |
Open or short in EGR valve circuit (1 trip detection logic) |
- Open or short in EGR valve circuit
- EGR valve assembly
- ECM
| HINT: DTC P0403 is set when the ignition switch is in the ON position. MONITOR DESCRIPTION
This DTC is designed to detect an open or short in the EGR valve assembly circuit.
If
the EGR terminal voltage is low when the EGR terminal output is off,
the ECM determines that the EGR valve circuit is malfunctioning. MONITOR STRATEGY |
Related DTCs | P0403: Exhaust gas recirculation control circuit range check | |
Required Sensors/Components (Main) | EGR valve | |
Required Sensors/Components (Related) | - | |
Frequency of Operation | Continuous | |
Duration | 1 second | | MIL Operation |
Immediate | | Sequence of Operation |
None | TYPICAL ENABLING CONDITIONS |
Monitor runs whenever following DTCs not present |
None | | Engine |
Running | | Battery voltage |
10.5 V or higher | | Starter |
OFF | TYPICAL MALFUNCTION THRESHOLDS |
One of the following conditions is met: | Condition 1, 2, 3 or 4 | |
1: Both conditions are met: | Condition A and B | |
A: Motor phase 1 output terminal voltage | Low | |
B: Either condition is met: | - | |
Motor | Driving | | Motor phase 1 |
Not operating | | 2: Both conditions are met: |
Condition A and B | | A: Motor phase 2 output terminal voltage |
Low | | B: Either condition is met: |
- | | Motor | Driving | |
Motor phase 2 | Not operating | |
3: Both conditions are met: | Condition A and B | |
A: Motor phase 3 output terminal voltage | Low | |
B: Either condition is met: | - | |
Motor | Driving | | Motor phase 3 |
Not operating | | 4: Both conditions are met: |
Condition A and B | | A: Motor phase 4 output terminal voltage |
Low | | B: Either condition is met: |
- | | Motor | Driving | |
Motor phase 4 | Not operating | CONFIRMATION DRIVING PATTERN
- Connect the Techstream to the DLC3.
- Turn the ignition switch to ON and turn the Techstream on [A].
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) (See page
).
- Start the engine and warm it up [B].
- Drive the vehicle at 20 km/h (12 mph) or more for 10 minutes [C].
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
- Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [D].
- Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
- Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
- Input the DTC: P0403.
- Check the DTC judgment result.
|
Techstream Display |
Description |
|
NORMAL |
- DTC judgment completed
- System normal
|
|
ABNORMAL |
- DTC judgment completed
- System abnormal
|
|
INCOMPLETE |
- DTC judgment not completed
- Perform driving pattern after confirming DTC enabling conditions
|
|
N/A |
- Unable to perform DTC judgment
- Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit
|
HINT:
If the judgment result shows ABNORMAL, the system has a malfunction.
- If the test result is INCOMPLETE or N/A and no pending DTC is output,
perform a universal trip and check for permanent DTCs (See page
).
HINT:
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.
WIRING DIAGRAM Refer to DTC P0401 (See page
). CAUTION / NOTICE / HINT
HINT: Read
freeze frame data using the Techstream. The ECM records vehicle and
driving condition information as freeze frame data the moment a DTC is
stored. 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. PROCEDURE
| 1. |
PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE EGR VALVE) |
(a) Connect the Techstream to the DLC3. (b) Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.
HINT:
- When performing the Active Test, make sure the shift lever is in P or N.
- The A/C switch and all accessory switches should be off.
(c) Turn the Techstream on. (d) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position.
(e)
Confirm the Throttle Idle Position is ON and check the engine idling
condition and MAP values in the Data List while performing the Active
Test.
HINT:
- Do not leave the EGR valve open for 10 seconds or more during the Active Test.
- Be sure to return the EGR valve to step 0 when the Active Test is completed.
OK: MAP and idling condition change in response to EGR step position as follows.
Standard: |
- | EGR Step Position (Active Test) | |
0 Steps | 0 to 30 Steps | |
Idling condition | Steady idling |
Idling changes from steady to rough idling or engine stall | |
MAP (Data List) |
20 to 40 kPa (150 to 300 mmHg) |
MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed |
| OK |
 | CHECK FOR INTERMITTENT PROBLEMS |
|
NG |
 | |
| 2. |
INSPECT EGR VALVE ASSEMBLY | (a) Inspect the EGR valve assembly (See page
). HINT: Perform "Inspection After Repair" after replacing the EGR valve assembly (See page
).
| NG | |
REPLACE EGR VALVE ASSEMBLY |
|
OK | |
| |
| 3. |
INSPECT EGR VALVE ASSEMBLY (+B OR +B2 VOLTAGE) |
 (a) Disconnect the EGR valve assembly connector.
(b) Measure the voltage according to the value(s) in the table below. Standard Voltage: |
Tester Connection | Switch Condition |
Specified Condition | |
D85-5 (+B1) - Body ground |
Ignition switch ON | 11 to 14 V | |
D85-2 (+B2) - Body ground |
Ignition switch ON | 11 to 14 V |
(c) Reconnect the EGR valve assembly connector.
| NG |
| GO TO STEP 6 |
|
OK | |
| |
| 4. |
CHECK HARNESS AND CONNECTOR (ECM - EGR VALVE ASSEMBLY) |
 (a) Disconnect the EGR valve assembly connector.
(b) Disconnect the ECM connector. (c) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open): |
Tester Connection | Condition |
Specified Condition | |
D74-48 (EGR1) - D85-4 (EGR1) |
Always | Below 1 Ω | |
D74-1 (EGR2) - D85-3 (EGR2) |
Always | Below 1 Ω | |
D74-24 (EGR3) - D85-6 (EGR3) |
Always | Below 1 Ω | |
D74-47 (EGR4) - D85-1 (EGR4) |
Always | Below 1 Ω |
Standard Resistance (Check for Short): |
Tester Connection | Condition |
Specified Condition | |
D74-48 (EGR1) or D85-4 (EGR1) - Body ground |
Always | 10 kΩ or higher | |
D74-1 (EGR2) or D85-3 (EGR2) - Body ground |
Always | 10 kΩ or higher | |
D74-24 (EGR3) or D85-6 (EGR3) - Body ground |
Always | 10 kΩ or higher | |
D74-47 (EGR4) or D85-1 (EGR4) - Body ground |
Always | 10 kΩ or higher |
(d) Reconnect the EGR valve assembly connector. (e) Reconnect the ECM connector.
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
OK | |
| |
| 5. |
CHECK WHETHER DTC OUTPUT RECURS (DTC P0403) |
(a) Connect the Techstream to the DLC3. (b) Turn the ignition switch to ON and turn the Techstream on.
(c) Clear DTCs (See page ). (d) Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
(e) Confirm that no DTC is set using the Techstream. Result |
Result | Proceed to | |
DTC P0403 output | A | |
No DTC output | B |
| A |
| REPLACE ECM |
| B |
| END |
| 6. |
CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - EGR VALVE ASSEMBLY) |
 (a) Disconnect the EGR valve assembly connector.
(b) Remove the integration relay from engine room relay block. (c) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for open): |
Tester Connection | Condition |
Specified Condition | |
2B-4 - D85-5 (+B1) | Always |
Below 1 Ω | |
2B-4 - D85-2 (+B2) | Always |
Below 1 Ω | Standard Resistance (Check for short): |
Tester Connection | Condition |
Specified Condition | |
2B-4 or D85-5 (+B1) - Body ground |
Always | 10 kΩ or higher | |
2B-4 or D85-2 (+B2) - Body ground |
Always | 10 kΩ or higher |
(d) Reconnect the EGR valve assembly connector. (e) Reinstall the integration relay.
| OK |
| CHECK ECM POWER SOURCE CIRCUIT |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR | | 
