Toyota Tundra Service Manual: On-vehicle Inspection

ON-VEHICLE INSPECTION

PROCEDURE

1. CHECK FUEL PUMP OPERATION AND FOR FUEL LEAK

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

NOTICE:

Do not start the engine.

(c) Turn the Techstream main switch on.

(d) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump / Speed.

(e) Check the fuel pump operation.

(1) Check for pressure in the fuel inlet tube from the fuel line. Check that the sound of fuel flowing in the fuel tank can be heard.

If there is no sound, check the integration relay, fuel pump, ECM and wiring connector.

(f) Check for fuel leak.

(1) Check that there are no fuel leaks after performing maintenance anywhere on the system.

If there are fuel leaks, repair or replace parts as necessary.

2. CHECK FUEL PRESSURE

(a) Check that the battery voltage is 11 to 14 V.

(b) Perform the "DISCHARGE FUEL SYSTEM PRESSURE" procedures (See page ).

(c) Disconnect the cable from the negative (-) battery terminal.

(d) Remove the fuel pipe clamp from the fuel tube connector.

(e) Disconnect the No. 1 fuel pipe sub-assembly (for Quick Type B) (See page ).

(f) Install SST (pressure gauge) as shown in the illustration. SST: 09268-45101 09268-41250 09268-41260 09268-41280 09268-41500 09268-41700 95336-08070

(g) Wipe off any gasoline.

(h) Reconnect the cable to the negative (-) battery terminal.

(i) Operate the fuel pump.

(1) Connect the Techstream to the DLC3.

(2) Turn the ignition switch to ON.

NOTICE:

Do not start the engine.

(3) Turn the Techstream main switch on.

(4) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump / Speed.

(j) Measure the fuel pressure.

Standard fuel pressure:

281 to 287 kPa (2.87 to 2.93 kgf/cm2, 41 to 42 psi)

If the pressure is higher than the specification, replace the fuel pressure regulator.

If the pressure is lower than the specification, check the fuel hoses and connections, fuel pump, fuel filter and fuel pressure regulator assembly.

(k) Start the engine.

(l) Measure the fuel pressure.

Standard fuel pressure:

281 to 287 kPa (2.87 to 2.93 kgf/cm2, 41 to 42 psi)

If the pressure is not as specified, check the fuel pump, pressure regulator and/or injectors.

(m) Stop the engine.

(n) Check that the fuel pressure remains as specified for 5 minutes after the engine has stopped.

Standard fuel pressure:

147 kPa (1.5 kgf/cm2, 21 psi) or higher

If the pressure is not as specified, check the fuel pump, pressure regulator and/or injectors.

(o) After checking the fuel pressure, disconnect the cable from the negative (-) battery terminal and carefully remove SST and the fuel tube connector to prevent gasoline from spraying.

(p) Reconnect the No. 1 fuel pipe sub-assembly (for Quick Type B) (See page ).

(q) Check for fuel leak.

(1) Check that there are no fuel leaks after performing maintenance anywhere on the system.

If there are fuel leaks, repair or replace parts as necessary.