Fuel Pressure: Testing and Inspection

On-Vehicle 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 front fuel pipe from the LH delivery pipe.




d. Install the front fuel pipe and SST (pressure gauge) to the delivery pipe with the 3 lower gaskets and SST (adaptor).
SST 09268-45014 (09268-41190, 90405-06167)

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

e. Wipe off any splattered gasoline.
f. Reconnect the negative (-) terminal cable to the battery.
g. Connect a LEXUS hand-held tester or OBD II scan tool to the DLC3 (See step 1).
h. Measure the fuel pressure.

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

If pressure is higher than the specification, replace the fuel pressure regulator.

If pressure is lower than the specification, check these parts:
- Fuel hoses and connections
- Fuel pump
- Fuel filter
- Fuel pressure regulator

i. Disconnect the LEXUS hand-held tester or OBD II scan tool from the DLC3.
j. Start the engine.
k. Measure the fuel pressure at idle.

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

l. Stop the engine.

m. Check that the fuel pressure remains in the specification below for 5 minutes after the engine stop.

Fuel pressure:
147 kPa (1.5 kgf/sq.cm, 21 psi) or more

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

n. After checking the fuel pressure, disconnect the negative (-) terminal cable from the battery and carefully remove the SST to prevent gasoline from splashing.
SST 09268-45014

o. Reinstall the front fuel pipe to the LH delivery pipe.
p. Reconnect the negative (-) terminal cable to the battery.
q. Check for fuel leaks.
r. Reinstall the V-bank cover with the 2 bolts and nuts.
s. Reconnect the fuel return hose to the clamp on the V-bank cover.