Service Procedure

1. If you can verify the incident with the conditions listed, follow the diagnostic flowchart (cold engine, normal cranking speed).

2. Make sure the base idle is correct (see the flowchart).

3. Replace the engine control module (ECM) only if no other trouble is found. Use the chart for the correct part number.





Diagnostic Flowchart

Service Procedure "A"

If the vehicle cranks at normal speed but does not start when warm or hot, check the fuel injectors for leakage using the following procedure:

1. Release the fuel pressure.
2. Disconnect the fuel hoses between the fuel filter and the fuel tube.
3. Install a fuel pressure gauge between the fuel filter and fuel tube.
4. Clamp the fuel return line after the fuel pressure regulator. Be careful not to damage the hose.
5. Turn the ignition key to the "ON" position. You may need to cycle the key on/off several times to build up pressure in the line. Wait five seconds after turning the key off before repeating the cycle.
6. Clamp the inlet fuel hose just before the fuel pressure regulator.
7. Note the reading on the fuel pressure gauge.
8. If the pressure drops to almost zero within 1 minute, remove the fuel tubes with the injectors installed and repeat the test to isolate a leaking fuel injector.
WARNING:
Be sure workshop has a CO2 fire extinguisher.
Keep open flames and sparks away from work area.
CAUTION:
Before removing fuel line parts, carry out the following procedures:
^ Put drained fuel in an explosion-proof container and put the lid on securely.
^ Refer to "Changing Fuel Filter" in the MA section of the service manual.
^ Disconnect the battery ground cable.
^ Do not kink or twist tubes when they are being installed.
^ Do not tighten hose clamps excessively to avoid damaging hoses.
^ After installing tubes, run the engine and check for fuel leaks at connections.

9. Replace any leaking injectors and reassemble.





Service Procedure "B"

Service Procedure "C"

If the vehicle cranks fast as if it has no compression when cold, perform a cylinder leakage or compression test to verify compression loss. Compression test results of 160 psi or less may indicate carbon deposits on the valve seats. If a cylinder leakage test is performed, the front O2 sensor may be removed to listen for leakage past the exhaust valves of # 2, # 4, and # 6 to confirm this condition.

If you can confirm this condition, install C/M starter P/N 23300-31U01R. This started has 10 teeth on the pinion gear to crank the engine faster, restoring the sealing at the valve seats more quickly. If the no start incident cannot be duplicated, but the customer describes that the engine cranks fast as if there is no compression cold, install the C/M starter. This C/M starter was applied to production on December 8, 1995.

Check the "Base Idle Speed" using CONSULT (Work Support, IACV-AAC Valve Adjust) and adjust to specification if necessary.