Symptom Related Diagnostic Procedures

DESCRIPTION
The Engine Cranks but Does Not Run diagnostic table is an organized approach to identifying a condition that prevents an engine from starting. The Engine Cranks but Does Not Run diagnostic table directs the service technician to the appropriate system diagnosis.

The Engine Cranks but Does Not Run diagnostic table assumes the following:
^ The battery is completely charged.
^ The engine cranking speed is within specifications.
^ There is adequate fuel in the fuel tank.

DIAGNOSTIC AIDS
Inspect for the following conditions:
^ Mass air flow (MAF) is compared to a calculated mass air flow based upon the manifold absolute pressure (MAP), the throttle position (TP), and the engine RPM readings. A skewed or unresponsive MAP sensor at KEY ON will cause the predicted air flow value to be inaccurate. Compare the MAP and the TP sensor value to that of a known good vehicle.
^ Faulty engine coolant temperature (ECT) sensor. Using a scan tool, compare engine coolant temperature with intake air temperature (IAT) on a completely cool engine. The engine coolant temperature should be within 3°C (5°F) of the intake air temperature. If not, refer to DTC P0128. P0128

For an intermittent condition, refer to Intermittent Conditions. Intermittent Conditions

TEST DESCRIPTION

Steps 1-5:

Steps 6-10:

The number below refers to the step number on the diagnostic table.
7. This step determines if the camshaft position (CMP) sensor is functioning properly.