Engine Cranks But Does Not Run

DESCRIPTION
The Engine Cranks but Does Not Run diagnostic table is an organized approach to identifying a condition that causes an engine to not start. The diagnostic table directs the service technician to the appropriate system diagnosis. The diagnostic table assumes the following conditions are met:
^ The battery is completely charged. Refer to Battery Inspection/Test in Starting and Charging. Battery Inspection/Test
^ The engine cranking speed is within specification. Refer to Engine Cranks Slowly in Starting and Charging. Engine Cranks Slowly
^ There is adequate fuel in the fuel tank.

DIAGNOSTIC AIDS
Inspect for the following conditions:
^ The mass air flow (MAF) is compared to a calculated MAF based upon the manifold absolute pressure (MAP), the throttle position (TP), and the engine RPM. A skewed or unresponsive MAP sensor at key ON will cause the predicted air flow value to be inaccurate. Compare the MAP and TP readings to that of a known good vehicle.
^ Inspect for a faulty engine coolant temperature (ECT) sensor. Use a scan tool in order to compare the ECT with the intake air temperature (IAT) on a completely cooled engine. The ECT should be within 3°C (5°F) of the IAT.
^ For an intermittent condition, refer to Intermittent Conditions.

TEST DESCRIPTION

Steps 1-6:

Steps 7-12:

The numbers below refer to the step numbers on the diagnostic table.
4. You may need to connect a battery charger to the battery for this step. If the battery state of charge is low, the scan tool may reset during the cranking test.
5. This step tests the ignition relay for proper operation. The ignition relay supplies voltage to the injectors and the ignition coils. When the ignition relay is not operating properly, a no start condition occurs. If the test lamp does not illuminate, this indicates the ignition relay is not supplying a voltage to the fuses.