Symptom Related Diagnostic Procedures

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 Cranks/Cranks Slowly, but Does Not Start in Starting and Charging for diagnosis. Make sure that there is adequate fuel in the tank. Testing and Inspection

DIAGNOSTIC AIDS
The following may cause an intermittent:
- Poor connections-refer to Testing for Intermittent and Poor Connections in Diagrams.
- Corrosion
- Mis-routed harness
- Rubbed through wire insulation
- Broken wire inside the insulation
^ 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. Refer to MAF Sensor Replacement for procedures.
^ If certain components are disconnected at the same time, the engine may not start and NO DTCs set.
^ For an intermittent, refer to Symptoms. Symptom Related Diagnostic Procedures

TEST DESCRIPTION

Steps 1 - 4:

Steps 5 - 11:

Steps 12 - 18:

The numbers below refer to the step numbers on the diagnostic table.
2. Certain DTCs only set while cranking the engine. This step verities if a component is causing the no start condition.
4. 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 teed 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.
5. This step verities 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 suppling a voltage to the fuses.
6. The Crankshaft Position sensor is located near the starter.
7. The Camshaft Position sensor is located at the rear of the engine behind the intake manifold.
8. The ignition feed circuit for the Camshaft and Crankshaft Position sensors is internally connected within the PCM. A short to ground on either circuit causes a no start condition.
10. The fuel cap may need to be removed to hear if the fuel pump is operating.