Fuel Pressure: Testing and Inspection

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 09268-45014 (09268-41190, 90405-06167)

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

(e) Wipe off any splattered gasoline.





(f) Connect the LEXUS hand-held tester to the DLC3.
(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 handheld 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.