Engine Cranks But Does Not Run

Engine Cranks But Does Not Run

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 2 separate ignition coils, an electronic ignition control module (ICM) and a crankshaft position (CKP) sensor as well as the related connecting wires and the ignition control (IC) portion of the powertrain control module (PCM). Each secondary circuit consists of the secondary winding of the coil, spark plug wires, and the spark plugs.

Important: The camshaft position (CMP) sensor is only used for a misfire detection and is not part of the ignition system.

Diagnostic Aids

Test/Inspect for the following conditions:

- Collapsed air intake duct.
- Restricted air filter element.
- A TP sensor that reads too high or skewed may cause an incorrect fueling condition.
- A TP sensor binding or sticking in wide open position.
- A TP sensor shorted or open.
- Fuel contamination.
- Out of fuel.
- Restricted exhaust system.
- Low compression.
- A cold engine that has not been started should display ECT and IAT temperatures that are relatively close to each other.
- A skewed MAP sensor. The MAP sensor value should change when cranking the engine. Compare any questionable barometer readings with that of a known good vehicle.
- Check for proper Idle Air Control (IAC) operation.

Check for intermittent conditions.

Test Description

The number below refers to the step number on the diagnostic table.

3. While cranking the engine, the CKP activity (CKP reference signal) should increment to 255, then rollover to 0.
8. This step tests for a short to voltage on the injector driver circuits.
9. This step tests the ability of the PCM to provide a ground path for each injector.