Fuel Pressure: Testing and Inspection

ON-VEHICLE INSPECTION
1. CHECK FUEL PUMP OPERATION
- Connect the TOYOTA hand-held tester to the DLC3.
- Turn 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.

(See step 2 in fuel pump inspection)





- 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 the following parts:
- Fusible link
- H-fuse (AM2 30A)
- Fuses (EFI 15A. IGN 10A)
- EFI main relay
- Fuel pump
- Wiring connections
- Turn the ignition switch OFF.
- Remove TOYOTA hand-held tester.
2. CHECK FUEL PRESSURE
- Check that the battery voltages is above 12 volts.
- Disconnect the negative (-) terminal cable from the battery.





- Remove the union bolt and 2 gaskets, and disconnect the fuel in let hose 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 hose and SST (pressure gauge) to the delivery pipe with 3 new gaskets and SST (union bolt). SST 09268-45012

Torque: 29 N.m (300 kgf.cm, 22 ft.lbf)

- Wipe off any splattered gasoline.





- Using SST, connect terminals +B and FP of the DLC1.
SST 09843-18020
- Reconnect the negative (-) terminal cable to the battery.
- Turn the ignition switch ON.
- Measure the fuel pressure.

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

- If pressure is high, replace the fuel pressure regulator.
- If pressure is low, check the following parts:
- Fuel hoses and connections
- Fuel pump
- Fuel filter
- Fuel pressure regulator
- Remove the SST. SST 09483-18020
- 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
(2.7 - 3.1 kgf/sq.cm, 38 - 44 psi)





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

Fuel pressure: 206 - 255 kPa
(2.1 - 2.6 kgf/ sq.cm, 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 is stopped.

Fuel pressure: 147 kPa (1.5 kgf/ sq.cm, 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 the SST to prevent gasoline from splashing. SST 09268-450121





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

Torque: 29 N.m (300 kgf.cm. 22 ft.lbf)

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