- Install a scan tool.
- Monitor the powertrain control module (PCM) for DTCs with a scan tool.
If other DTCs are set, except DTC P0315, refer to
Diagnostic Trouble Code (DTC) List - Vehicle
in Vehicle DTC Information
for the applicable DTC that set.
- Select the crankshaft position variation learn procedure with a scan tool.
- The scan tool instructs you to perform the following:
| 4.1. | Accelerate to wide open throttle (WOT). |
| 4.2. | Release the throttle when fuel cutoff occurs. |
| 4.3. | Observe the fuel cutoff specifications for the applicable engine. |
| 4.4. | The engine should not accelerate beyond the calibrated RPM value. |
| 4.5. | Release the throttle immediately if value is exceeded. |
| 4.6. | Block the drive wheels. |
| 4.7. | Set the parking brake. |
| 4.8. | DO NOT apply the brake pedal. |
| 4.9. | Cycle the ignition from OFF to ON. |
| 4.10. | Apply and hold the brake pedal. |
| 4.11. | Start and idle the engine. |
| 4.13. | The vehicle must remain in Park or Neutral. |
| 4.14. | The scan tool monitors certain component signals to determine if all the
conditions are met to continue with the procedure. The scan tool only displays the
condition that inhibits the procedure. The scan tool monitors the following components: |
| • | Crankshaft position (CKP) sensor activity--If there is a CKP sensor
condition, refer to the applicable DTC that set. |
| • | Camshaft position (CMP) signal activity--If there is a CMP signal
condition, refer to the applicable DTC that set. |
| • | Engine coolant temperature (ECT)--If the engine coolant temperature
is not warm enough, idle the engine until the engine coolant temperature reaches
the correct temperature. |
Important: While the learn procedure is in progress,
release the throttle immediately when the engine starts to decelerate. The engine
control is returned to the operator and the engine responds to throttle position after
the learn procedure is complete.
- Enable the crankshaft position system variation learn procedure with the scan
tool and perform the following:
| 5.2. | Release when the fuel cutoff occurs. |
- The scan tool displays Learn Status: Learned this ignition. If the scan
tool indicates that DTC P0315 ran and passed, the CKP Variation Learn Procedure
is complete. If the scan tool indicates DTC P0315 failed or did not run, refer
to
DTC P0315
. If any other DTCs set, refer
to
Diagnostic Trouble Code (DTC) List - Vehicle
in
Vehicle DTC Information for the applicable DTC that set.
- Turn OFF the ignition for 30 seconds after the learn procedure
is completed successfully.
- The CKP system variation learn procedure is also required when the following
service procedures have been performed, regardless of whether DTC P0315 is
set:
| • | A harmonic balancer replacement |
| • | Any engine repairs which disturb the crankshaft to CKP sensor relationship |
