Fuel Pressure: Testing and Inspection
ON-VEHICLE INSPECTION1. CHECK FUEL PUMP OPERATION
a. Connect a hand-held tester to the DLC3.
b. Turn the ignition switch ON, and push the hand-held tester main switch ON.
NOTE: Do not start the engine.
c. Select the ACTIVE TEST mode on the hand-held tester.
d. Please refer to the hand-held tester operator's manual for further details.
e. Check that the pulsation damper screw rises up when the fuel pump operates.
If operation is not as specified, check the fusible link, fuses, EFI main relay, fuel pump, ECM and wiring connections.
f. Turn the ignition switch OFF.
g. Disconnect the 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 front fuel pipe from the LH delivery pipe.
d. Install the front fuel pipe and SST (pressure gauge) to the delivery pipe with 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 hand-held tester to the DLC3 (See step 1 in check fuel pump operation (a) to (e)).
h. Measure the fuel pressure.
Fuel pressure: 265 - 304 kPa (2.7 - 3.1 kgf/sq.cm, 38 - 44 psi)
If pressure is high, replace the fuel pressure regulator. If pressure is low, check the fuel hoses and connections, fuel pump, fuel filter and fuel pressure regulator.
i. Disconnect the hand-held tester from the DLC3.
o. 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 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.
n. 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
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.