- Install a scan tool.
- Monitor the ECM for DTCs with a scan tool. If other DTCs are set, except DTC P0315, refer to
Diagnostic Trouble Code (DTC) List - Vehicle
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 throttle when fuel cut-off occurs. |
| 4.3. | Observe fuel cut-off for applicable engine. |
| 4.4. | Engine should not accelerate beyond calibrated RPM value. |
| 4.5. | Release throttle immediately if value is exceeded. |
| 4.8. | DO NOT apply brake pedal. |
| 4.9. | Cycle ignition from OFF to ON. |
| 4.10. | Apply and hold brake pedal. |
| 4.11. | Start and idle engine. |
- Enable the CKP system variation learn procedure with the scan tool and perform the following:
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 completed.
- Accelerate to WOT.
Release throttle when fuel cut-off 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 are set, refer to
Diagnostic Trouble Code (DTC) List - Vehicle
for the applicable DTC.
- 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
or not DTC P0315 is set:
| • | A harmonic balancer replacement |
| • | A crankshaft replacement |
| • | A CKP sensor replacement |
| • | Any engine repairs which disturb the crankshaft to CKP sensor relationship. |
