Engine Cranks But Does Not Run

Description
The Engine Cranks but Does Not Run diagnostic table assumes that battery condition and engine cranking speed are OK. Make sure that there is adequate fuel in the tank(s).

Diagnostic Aids

Important:
^ Remove any debris from the PCM/TAC module connector surfaces before servicing the PCM/TAC module. Inspect the PCM/TAC module connector gaskets when diagnosing/replacing the modules. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion into the PCM/TAC modules.
^ For any test that requires probing the PCM or a component harness connector, use the Connector Test Adapter Kit J 35616-A. Using this kit prevents damage to the harness/component terminals.
^ Inspect 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 airflow. If this corrects the condition and the connections are OK, replace the MAF sensor.
^ For an intermittent condition, refer to Symptoms. Symptom Related Diagnostic Procedures

Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. This step verifies the IGN relay for proper operation. The IGN relay supplies voltage to the injectors and the ignition coils. When the IGN relay is not operating properly, a no start condition occurs. If the test lamp does not illuminate, this indicates the IGN relay is not supplying a voltage to the fuses.
5. This step is testing for a DTC that sets while the engine is cranking.
6. This step is testing for a grounded ignition feed circuit for the crankshaft position sensor and the camshaft position sensor. When the ignition feed circuit is shorted, a no start occurs and no DTCs are set. The ignition feed circuits are connected internally within the PCM. The PCM cannot detect that the engine is cranking with a grounded ignition feed circuit. If no engine speed is displayed on the scan tool, inspect the ignition feed circuit for a short to ground. The scan tool may reset if the battery is at a low state of charge. The battery may need to be charged to perform this step.
7. This step is testing for B+ supply to the crankshaft position sensor.
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.
11. The fuel cap may need to be removed in order to hear if the fuel pump is operating.