Fuel Pump: Testing and Inspection

1. CHECK FUEL PUMP OPERATION.

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

HINT: At this time, you will hear fuel return noise.

If there is no pressure, check these parts:
^ Fusible links (AM1 4OA, AM2 3OA, ALT 8OA)
^ Fuses (EFI 15A, IGN 7.5A)
^ EFI main relay
^ Fuel pump
^ ECM
^ Wiring connections
- Turn the ignition switch to LOCK.
- Remove the TOYOTA hand-held tester.

2. CHECK FUEL PRESSURE.
- Check that the battery voltage is above 12 volts.
- Disconnect the negative (-) terminal cable from the battery.
- 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.

- Install the fuel inlet pipe and SST 09268-45012 (pressure gauge) to the delivery pipe with 3 gaskets and SST (union bolt).

Torque: 29 Nm (22 ft lb)

- Wipe off any splattered gasoline.

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

NOTICE: Do not start the engine.

- Select the active test mode on the TOYOTA hand-held tester.
- Please refer to the TOYOTA hand - held tester operator's manual for further details.
- If you have no TOYOTA hand-held tester, connect the positive (+) and negative (-) leads from the battery to the fuel pump connector or connect terminals B+ and FP of the data link connector (DLC1).
- Reconnect the negative (-) terminal cable to the battery.
- Turn the ignition switch ON.
- Measure the fuel pressure.

Fuel pressure: 265-304 kPa (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
- Remove the TOYOTA hand-held tester.
- Start the engine.
- Disconnect the vacuum sensing hose from the fuel pressure regulator, and plug the hose end.
- Measure the fuel pressure at idle.

Fuel pressure: 265-304 kPa (38-44 psi)

- Reconnect the vacuum sensing hose to the fuel pressure regulator.
- Measure the fuel pressure at idle.

Fuel pressure: 206-255 kPa (31-37 psi)

If pressure is not as specified, check the vacuum sensing hose and fuel pressure regulator.
- Stop the engine.
- Check that the fuel pressure remains as specified for 5 minutes after the engine has stopped.

Fuel pressure: 147 kPa (21 psi) or more

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

- After checking fuel pressure, disconnect the negative (-) terminal cable from the battery and carefully remove SST 09268-45012 or equivalent to prevent gasoline from splashing.

- Reconnect the fuel inlet pipe to the delivery pipe with 2 new gaskets and the union bolt.

Torque: 29 Nm (22 ft lb)

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