Fuel Pressure: Testing and Inspection

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 RH fuel pressure pulsation damper





d. Install the fuel inlet hose and SST (pressure gauge) to the delivery pipe with 3 lower gaskets and the SST (union bolt).
SST 09268-5014 (09268-1190, 9040-06167)

Torque: 39 N.m (400 kgf.cm1 29 ft.lbf)

e. Wipe off any splattered gasoline.





f. Connect the LEXUS hand-held tester to the DLC3. (See step 1. (a) to (e) above)
g. Reconnect the negative (-) terminal cable to the battery.
h. Turn the ignition switch ON.
i. Measure the fuel pressure.

Fuel pressure: 304-343 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. Remove the LEXUS hand-held tester from the DLC3.
k. Start the engine.
l. Measure the fuel pressure at idle.

Fuel pressure: 304-343 kPa (3.1-3.5 kgf/Sq.cm, 44-50 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 kgf/Sq.cm, 21 psi) or more

If pressure is not as specified, check the fuel pump, pressure regulator and/or injectors.
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. Reinstall the fuel pressure pulsation damper.
q. Reconnect the negative (-) terminal cable to the battery.
r. Check for fuel leaks.