Fuel Pressure: Testing and Inspection

FUEL PRESSURE INSPECTION

(a) Check the battery positive voltage is above 12 V.
(b) Disconnect the negative (-) terminal cable from the battery.





(c) Remove the union bolt and 2 gaskets and disconnect the fuel inlet hose from the fuel filter outlet.

CAUTION:
- Put a shop towel under the fuel filter.
- Slowly loosen the union bolt.





(d) Install the fuel inlet hose and SST (pressure gauge) to the fuel filter outlet with the 3 gaskets and SST (union bolt). SST 09268-45012

Torque: 29 N.m (300 kgf.cm, 21 ft.lbf)

(e) Wipe off any splattered gasoline.





(f) Connect the TOYOTA hand-held tester to the DLC3.
- Reconnect the negative (-) terminal cable to the battery.
- Remove the fuse cover on the instrument panel.
- 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.
(h) Turn the ignition switch ON.
(i) Measure the fuel pressure.

Fuel pressure: 301 - 347 kPa
(3.1 - 3.5 kgf/sq.cm, 44 - 50 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
(j) Disconnect the TOYOTA hand-held tester from the DLC3.
(k) Reinstall the fuse cover on the instrument panel.
(l) Start the engine.
(m) Measure the fuel pressure at idle.

Fuel pressure: 301 - 347 kPa
(3.1 - 3.5 kgf/sq.cm, 44 - 50 psi)

(n) Stop the engine.
(o) Check that the fuel pressure remains as specified for 5 minutes after the engine has 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 injectors.
(p) After checking fuel pressure, disconnect the negative (-) terminal cable from the battery and carefully remove the SST to prevent gasoline from splashing. SST 09268-45012
(q) Reconnect the fuel inlet hose with 2 new gaskets and the union bolt.

Torque: 29 N.m (300 kgf.cm, 21 ft.lbf)

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