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 . |
• | The engine cranking speed is within specifications. Refer to Engine Cranks Slowly . |
• | There is adequate fuel in the fuel tank. |
• | The engine control module (ECM) uses the camshaft position (CMP) sensors to determine engine speed and position when there is a crankshaft position (CKP) sensor condition. |
• | The engine will operate with a CKP sensor condition only if the ECM has stored the learned reference position of the camshafts in memory. With a CKP sensor condition in the signal circuit, the engine will go into a limp home mode after a hard restart. The ECM then calculates engine speed from one of the CMP sensors. During a limp home mode, the following additional DTCs may set and should be ignored: |
- | DTC P0324 Knock Sensor (KS) Module Performance |
- | DTC P1011 Intake Camshaft Position Actuator Park Position Bank 1 |
• | Refer to Symptoms - Engine Controls and Hard Start for further diagnosis. |
The numbers below refer to the step numbers on the diagnostic table.
This step determines if there is a condition with the main relay causing the no start condition. Use the Capture Info function to store any DTC information that may have set previously, before clearing the DTC information.
This step determines if there is an internal ECM condition, or sub-system component DTC causing the no start.
This step determines if the fuel pump is turning ON. An audible sound can be heard at the fuel injector rail when the fuel pump is turned ON.
Step | Action | Values | Yes | No | ||||||||||||||||||||
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Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module Connector End Views or Engine Controls Connector End Views | ||||||||||||||||||||||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |||||||||||||||||||||
Important: Do not crank the engine. Does DTC P0685, P0686, P0687, P0689, or P0690 set? | -- | Go to Step 3 | ||||||||||||||||||||||
Does the scan tool display DTC P0118, P0201-P0206, P0335, P0336, P0337, P0338, P0351-P0356, P0601, P0602, P0604, P0606, P0627, P0628, P0629, P1629, P1630, P1631, or P2105? | -- | Go to Step 4 | ||||||||||||||||||||||
4 | Observe the Theft Deterrent DTC Information with a scan tool. Does the scan tool display any Theft Deterrent DTCs? | -- | Go to Step 5 | |||||||||||||||||||||
Important: Additional DTCs may set when using the fuel pump output control. With a scan tool, command the fuel pump ON. Does the fuel pump turn ON? | -- | Go to Step 6 | ||||||||||||||||||||||
6 |
Is the fuel pressure within the specified range while the fuel pump is operating? | 380-410 kPa (55-60 psi) | Go to Step 7 | Go to Fuel System Diagnosis | ||||||||||||||||||||
7 | Inspect for the following conditions:
Did you complete the action? | -- | Go to Step 8 | -- | ||||||||||||||||||||
8 |
Does the engine start and continue to operate? | -- | Go to Step 9 | Go to Step 2 | ||||||||||||||||||||
9 |
Are there any DTCs that have not been diagnosed? | -- | System OK |