Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

This Engine Cranks but Does Not Run is an organized approach to identify a condition which causes the engine to crank but not start. This diagnostic directs the technician to the appropriate system diagnosis.

This diagnostic assumes the system voltage levels are adequate for starter motor operation. Refer to Battery Inspection/Test and Engine Cranks Slowly . Fuel level and fuel quality should be determined for correct diagnosis.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Electrical Information Reference

Scan Tool Reference

Special Tools Required

J 26792 HEI Spark Tester

Attempt to start the engine. Engine should start and run.

1. Crank the engine for up to 30 seconds.
2. Observe the vehicle DTC information with a scan tool.

⇒	If any of the following DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle : P0201-P0206, P0335, P0336, P0351-P0353, P0601, P0602, P0604, P0685, P1516, P2610

3. Observe the engine speed parameter while cranking the engine.

⇒	If engine RPM is not indicated, refer to Electronic Ignition (EI) System Diagnosis .

4. Install a J 26792 .
5. Crank the engine for 15 seconds. Spark should be observed from the J 26792 .

⇒	If spark is not observed refer to Crankshaft Position Sensor System Diagnosis .

6. With the ignition ON and the engine OFF, test the fuses that are supplied by the powertrain relay for voltage.

⇒	If the test lamp does not illuminate on at least one side of each fuse refer to DTC P0685 .

Important: Additional DTCs may set when using the fuel pump output control.

7. Command the fuel pump ON and OFF. Fuel pump should energize when commanded ON, and de-energize when commanded OFF

⇒	If the fuel pump does not respond, refer to Fuel Pump Electrical Circuit Diagnosis .

8. Turn OFF the ignition.
9. Install the J 34730-1A Fuel Pressure Gage. Turn ON the ignition and command the fuel pump ON while observing the J 34730-1A . The fuel pressure should be between 384-425 kPa (56-62 psi).

⇒	If the fuel pressure is not within 384-425 kPa (56-62 psi), refer to Fuel System Diagnosis .

10. Inspect for the following conditions:

•	Compare the actual engine coolant temperature to the ECT parameter.

•	Air filter and air intake system for restrictions and obstructions

•	Test the fuel for contamination. Refer to Alcohol/Contaminants-in-Fuel Diagnosis .

•	Inspect the spark plug and spark plug wires. Refer to Spark Plug Wire Inspection and Spark Plug Inspection .

•	Test the exhaust system for restrictions. Refer to Restricted Exhaust .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.