Crankshaft Position Sensor System Variation Learn Procedure
CAUTION:
Before performing Crankshaft Position Sensor (CKP) system variation learn procedure, always set parking brake and block drive wheels in order to prevent personal injury. Ensure hood is closed. Release throttle immediately when engine starts to decelerate in order to eliminate over-revving engine. Once learn procedure has been completed, control module will return engine control to operator and engine will respond to throttle position.
NOTE:
Battery must be fully charged and in good condition. Scan tool connection at DLC should be clean and tight before starting CKP system variation learn procedure.
- Turn ignition off.
- Ensure hood is closed.
- Ensure engine is at normal operating temperature.
- Turn ignition off.
- Using scan tool, select and enable CKP Variation Learn Procedure.
- Set parking brake when instructed by scan tool.
- Start engine.
- Apply and hold service brake pedal firmly.
- Ensure transmission is in Park or Neutral.
- Steadily depress accelerator pedal until fuel cut-off is reached at 5150 RPM and hold. Release accelerator pedal after the second fuel cut-off has been reached.
- CKP system variation compensating values are learned when RPM decreases back to idle.
- Observe DTC status for DTC P1336.
- If scan tool indicates that DTC P1336 ran and passed, CKP system learn procedure is complete. If scan tool indicates that DTC P1336 failed, determine if other DTCs have set. If DTC other than P1336 is not set, repeat CKP learn procedure as necessary.