Fuel Pressure: 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 push the 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. Turn the ignition switch OFF.
g. Disconnect the TOYOTA hand-held tester from the DLC3.

2. CHECK FUEL PRESSURE
a. Check the battery positive voltage is above 12 V.
b. Disconnect the negative (-) terminal cable from the battery.
c. Remove the 6 bolts, and disconnect the No.2 timing belt cover.




d. Remove the union bolt holding the fuel pipe to the delivery pipe and gasket.

NOTE:
- Put a shop towel under the delivery pipe.
- Slowly loosen the union bolt.




e. Install SST (pressure gauge) to the delivery pipe with the 2 gaskets and SST (union and union bolt).
SST 09268-45014

Torque: 34.3 Nm (350 kg.cm, 25 ft.lb)

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

k. Disconnect the TOYOTA hand-held tester from the DLC3.
l. Reinstall the No.2 timing belt cover with the 6 bolts.
m. Start the engine.




n. Disconnect the vacuum sensing hose from the fuel pressure regulator, and plug the hose end.
o. Measure the fuel pressure at idle.

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

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

Fuel pressure:
226 - 265 kPa (2.3 - 2.7 kg/Sq.cm, 33 - 38 psi)

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

r. Stop the engine.
s. 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 injectors.

t. 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

u. Remove the other union bolt, 3 gaskets and fuel pipe from the delivery pipes.
v. Reinstall the fuel pipe with 4 new gaskets and the 2 union bolts.

Torque: 34.3 Nm (350 kg.cm, 25 ft.lb)

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