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 not to start. 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. Refer to Battery Inspection/Test in Starting And Charging. Battery Inspection/Test
^ The engine cranking speed is within specifications. Refer to Engine Cranks Slowly in Starting and Charging. Engine Cranks Slowly
^ There is adequate fuel in the fuel tank.

DIAGNOSTIC AIDS
Test/Inspect for the following conditions:
^ Fuel contamination. Refer to Alcohol/Contaminants-in-Fuel Diagnosis (Without Special Tool) or Alcohol/Contaminants-in-Fuel Diagnosis (With Special Tool). Component Tests and General Diagnostics Component Tests and General Diagnostics
^ Proper idle air control (IAC) operation. Refer to Idle Air Control (IAC) System Diagnosis. Component Tests and General Diagnostics
^ Intermittent conditions. Refer to Intermittent Conditions. Intermittent Conditions

TEST DESCRIPTION

Engine Cranks but Does Not Run - Steps 1-6:

Engine Cranks but Does Not Run - Steps 7-12:

The number below refers to the step number on the diagnostic table.
3. While cranking the engine, the crankshaft position (CKP) activity, CKP reference signal, should increment to 255, then rollover to 0.