Component Tests and General Diagnostics

CHECK FUEL PRESSURE

- Check the battery voltage above 12 volts.

- Disconnect the cable from the negative (-) terminal of the battery.

CAUTION: Work must be started after approx. 20 seconds or longer from the time the ignition switch is turned to the "LOCK" position and negative (-) terminal cable is disconnected from the battery.


- Remove the union bolt holding the LH deliver pipe to the rear fuel pipe. Remove the two gaskets.

HINT: Put a suitable container or shop towel under the cold start injector pipe.
Slowly loosen the union bolt.

Fuel Pressure Gauge Connection:

- Install the rear fuel pipe and pressure gauge to the LH delivery pipe with three new gaskets and the union bolt.

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

- Wipe off any splattered gasoline.

Jumper Wire Installation:

- Using a jumper wire, connect terminals B and FP of the data link connector 1.

- Reconnect the cable to the negative (-) terminal of the battery.

- Turn the ignition switch ON.

Reading Fuel Pressure:

- 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


- Remove jumper wire from the data link connector 1.

- Start the engine.

Checking Pressure - No Vacuum:

- Disconnect the vacuum sensing hose from the fuel pressure regulator, and plug the hose end.

- Measure the fuel pressure at idling.

Fuel pressure: 265 - 304 kPa (2.7 - 3.1 kgf/cm2, 38 - 44 psi)

Checking Pressure - With Vacuum:

- Reconnect the vacuum sensing hose to the fuel pressure regulator.

- Measure the fuel pressure at idling.

Fuel pressure: 196 - 235 kPa (2.0 - 2.4 kgf/cm2, 28 - 34 psi)

- If pressure is not as specified, check the vacuum sensing hose and fuel pressure regulator.

- Stop the engine. Check that the fuel pressure remains 147 kPa (1.5 kgf/cm2, 21 psi) or more for 5 minutes after the engine is turned off.

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

- After checking fuel pressure, disconnect the battery negative (-) cable and carefully remove the pressure gauge to prevent gasoline from splashing.


- Connect the rear fuel pipe to the delivery pipe with two new gaskets and the union bolt.

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

- Reconnect the cable to the negative (-) terminal of the battery.

- Check for fuel leaks.