Fuel Pressure: Testing and Inspection
FUEL PRESSURE TEST1. CHECK FUEL PUMP OPERATION.
(a) Using a jumper wire (or SST 09843-18020), connect terminals +B and FP of the data link connector 1.
(b) Turn the ignition switch ON.
NOTICE: Do not start the engine.
(c) Check that there is pressure in the hose from the fuel filter.
HINT: At this time, you will hear fuel return noise.
- If there is no pressure, check the following parts:
- Fusible link
- H-fuse (AM2 30A)
- Fuses (EFI I5A, IGN 10A)
- EFI main relay
- Fuel pump
- Wiring connections
(d) Turn the ignition switch OFF.
(e) Remove the jumper wire.
2. CHECK FUEL PRESSURE.
(a) Check that the battery voltages is above 12 volts.
(b) Disconnect the negative (-) terminal cable from the battery.
(c) Remove the union bolt and 2 gaskets, and disconnect the fuel inlet hose from the delivery pipe.
HINT:
- Put a suitable container or shop rag under the delivery pipe.
- Slowly loosen the union bolt.
(d) Install the fuel inlet hose and SST (pressure gauge) to the delivery pipe with 3 new gaskets and SST (union bolt). (SST 09268-45012)
Torque: 29 Nm (300 kgf.cm, 22 ft.lb)
(e) Wipe off any splattered gasoline.
(f) Using a jumper wire (or SST 09843-18020), connect terminals +B and FP of the data link 1.
(g) Reconnect the negative (-) terminal cable to the battery.
(h) Turn the ignition switch ON.
(i) Measure the fuel pressure.
Fuel pressure: 265 - 304 kPa (2.7 - 3.1 kgf/cm2, 38 - 44 psi)
- If pressure is high. replace the fuel pressure regulator.
- If pressure is low, check the following parts:
- Fuel hoses and connections
- Fuel pump
- Fuel filter
- Fuel pressure regulator
(j) Remove the jumper wire (SST 09483-18020).
(k) Start the engine.
(l) Disconnect the vacuum sensing hose from the fuel pressure regulator, and plug the hose end.
(m) Measure the fuel pressure at idle.
Fuel pressure: 265 - 304 kPa (2.7 - 3.1 kgf/cm2, 38 - 44 psi)
(n) Reconnect the vacuum sensing hose to the fuel pressure regulator.
(o) Measure the fuel pressure at idle.
Fuel pressure: 206 - 255 kPa (2.1 - 2.6 kgf/cm2, 31 - 37 psi)
- If pressure is not as specified, check the vacuum sensing hose and fuel pressure regulator.
(p) Stop the engine.
(q) Check that the fuel pressure remains as specified for 5 minutes after the engine is stopped.
Fuel pressure: 147 kPa (1.5 kgf/cm2, 21 psi) or more
- If pressure is not as specified, check the fuel pump, pressure regulator and/or injector.
(r) After checking fuel pressure, disconnect the negative (-) terminal cable from the battery and carefully remove the SST to prevent gasoline from splashing. (SST 09268-45012)
(s) Reconnect the fuel inlet hose to the delivery pipe with 2 new gaskets and the union bolt.
Torque: 29 Nm (300 kgf.cm, 22 ft.lb)
(t) Reconnect the negative (-) terminal cable to the battery.
(u) Check for fuel leakage.