Engine Cranks, But Will Not Run

DESCRIPTION

The Engine Cranks but Does Not Run diagnostic table assumes that battery condition and engine cranking speed are OK. If the battery condition and the cranking speed are not OK refer to Engine Electrical under Diagrams for diagnosis. Make sure that there is adequate fuel in the tank(s).

DIAGNOSTIC AIDS

^ Check the duct work between the Mass Air Flow (MAF) sensor and the throttle body for air leaks.

^ A malfunctioning MAF sensor may cause a no start or a stall after start. If you suspect this, disconnect the MAF sensor. The PCM will default to the speed density (MAP, IAT, RPM) in order to calculate the load and the air flow. If this corrects the condition and the connections are OK, replace the MAF sensor.

If the steps above check OK, refer to Symptoms. Testing and Inspection

TEST DESCRIPTION

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

2. This step checks the IGN mini relay for proper operation. The IGN mini relay supplies voltage to the injectors and the ignition coils. When the IGN mini relay is not operating properly, a no start condition occurs. If the test lamp does not illuminate, this indicates the ION mini relay is not suppling a voltage to the fuses. Refer to Ignition Relay Diagnosis for further diagnosis. Ignition Relay Diagnosis

8. The ignition feed circuits for the Camshaft and Crankshaft Position sensors is internally connected within the PCM. A short to ground on either circuit will cause a no start condition.