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. The CMP sensor is not part of the ignition system.

Diagnostic Aids

Inspect and/or test for the following conditions:

- A collapsed air intake duct
- A restricted air filter element-Refer to Air Cleaner Element Replacement .
- A throttle position (TP) sensor that reads too high or skewed, that may cause an incorrect fueling condition
- A TP sensor that is binding or sticking in wide open position
- A TP sensor that is shorted or open
- Fuel contamination
- No fuel
- Restricted exhaust system-Refer to Restricted Exhaust .
- Low compression-Refer to Engine Compression Test .
- A cold engine that has not been started should display engine coolant temperature (ECT) and intake air temperatures (IAT) that are relatively close to each other.
- A skewed manifold absolute pressure (MAP) sensor. The MAP sensor value should change when cranking the engine. Compare any questionable barometer readings with readings from a known good vehicle.

Check for intermittent conditions. Refer to Intermittent Conditions .

Test Description

The numbers below refer to the step numbers on the diagnostic table:

3. While cranking the engine, the CKP activity, indicated by the CKP reference signal, should increment to 255, then roll over to 0.