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Chart A-3 Engine Cranks But Will Not Run:

Electronic Ignition Wiring Circuit:

Condition:

Engine cranks but will not run, or engine may start, but immediately stops running. Battery condition and engine cranking speed are OK and there is adequate fuel in the tank.

Circuit Description:

This engine is equipped with a distributorless ignition system called the Electronic Ignition (EI) system. The primary circuit of the EI system consists of two separate ignition coils, an electronic Ignition Control Module (ICM) and Crankshaft Position (CKP) sensor as well as the related connecting wires and the Ignition Control (IC) portion of the PCM. Each secondary circuit consists of the secondary winding of the coil, two connecting metal strips molded into the coil housing, the spark plug boot/connector assemblies and spark plugs.

Chart Test Description: Number(s) below refer to circled number(s) on the diagnostic chart.

1. This verifies MIL operation, on-board diagnostics, cranking RPM, TP sensor, MAP sensor and engine coolant sensor signals are normal. A blinking injector test light verifies that the PCM is receiving a 7X reference signal and is attempting to activate the injectors.
2. The fuel pump should be switched "ON" by the PCM for 2-3 seconds after ignition is turned "ON." It is necessary to turn the ignition "OFF" for at least 10 seconds to assure that the PCM powers down and will then switch the fuel pump back "ON." If the fuel pump operates, but power is not available at injector harness, circuit must be open. If the fuel pump does not operate, CHART A-7 or A-5 should be used to diagnose the cause. Chart A-5 Fuel Pump Relay Circuit Diagnosis Related Tests, Information and Procedures
3. This verifies that the injectors are receiving proper voltage to fire the injectors.
4. This determines whether harness or injector is cause of incorrect resistance.
5. Also check plugs for a cracked insulator, carbon deposit buildup, and proper gap.

Diagnostic Aids:

Check for:
^ TP sensor binding or sticking in Wide Open Throttle (WOT) position or intermittently shorted or open.
^ Water or foreign material in fuel.
^ Low compression (timing chain failure).