Fuel Pump: Testing and Inspection

FUEL PUMP

ON-VEHICLE INSPECTION

1. CHECK FUEL PUMP OPERATION




a. Connect the TOYOTA hand-held tester to the DLC3.
b. Turn the ignition switch ON and TOYOTA hand-held tester main switch ON.

NOTE: Do not start the engine.

c. Select the active test mode on the TOYOTA hand-held tester.
d. Please refer to the TOYOTA hand-held tester operator's manual for further details.

e. If you have no TOYOTA hand-held tester, connect the positive (+) and negative (-) leads from the battery to the fuel pump connector.




f. Check that there is pressure in the inlet hose from the fuel filter.

HINT: At this time, you will hear fuel return noise.
If there is no pressure, check these parts:
- M-Fuse (AM2 30A)
- Fuses (EFI 15A, IGN 7.5A)
- EFI main relay
- Fuel pump
- ECM
- Wiring connections

g. Turn the ignition switch to LOCK.
h. Remove the TOYOTA hand-held tester.




2. CHECK FUEL PRESSURE
a. Check that the battery positive voltage is above 12 volts.
b. Disconnect the negative (-) terminal cable from the battery.
c. Remove the union bolt and 2 gaskets, and disconnect the fuel inlet pipe from the delivery pipe.

HINT:
- Put a suitable container or shop rag under the delivery pipe.
- Slowly loosen the union bolt.




d. Install the fuel inlet pipe and SST (pressure gauge) to the delivery pipe with the 3 gaskets and SST (union bolt).
SST 09268-45014

Torque: 29 Nm (300 kg.cm, 22 ft.lb)

e. Wipe off any splattered gasoline.
f. Connect the TOYOTA hand-held tester to the DLC3. (See step 1.)
g. Reconnect the negative (-) terminal cable to the battery.
h. Turn the ignition switch ON.
i. Measure the fuel pressure.

Fuel pressure: 265 - 304 kPa (2.7 - 3.1 kg/Sq.cm, 38 - 44 psi)

If pressure is high, replace the fuel pressure regulator.
If pressure is low, check these parts:
- Fuel hoses and connections
- Fuel pump
- Fuel filter
- Fuel pressure regulator
- Injectors

j. Disconnect the TOYOTA hand-held tester from the DLC3.
k. Start the engine.
l. Measure the fuel pressure at idle.

Fuel pressure: 206 - 255 kPa (2.1 - 2.6 kg/Sq.cm, 31 - 37 psi)

If pressure is not as specified, check the vacuum sensing hose and fuel pressure regulator.

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

Fuel pressure: 147 kPa (1.5 kg/Sq.cm, 21 psi) or more If pressure is not as specified, check the fuel pump, pressure regulator and/or injector.

o. After checking fuel pressure, disconnect the negative (-) terminal cable from the battery and carefully remove the SST to prevent gasoline from splashing.
SST 09268-45014
p. Reconnect the fuel inlet pipe to the delivery pipe with 2 new gaskets and the union bolt.

Torque: 29 Nm (300 kg.cm, 22 ft.lb)

q. Reconnect the negative (-) terminal cable to the battery.
r. Check for fuel leakage.