- Install a scan tool.
- Monitor the powertrain control module for DTCs with a scan tool. If other
DTCs are set, except DTC P1336, refer to
Diagnostic Trouble Code (DTC) List
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:
| • | Accelerate to wide open throttle (WOT). |
| • | Release throttle when fuel cutoff occurs. |
| • | Observe fuel cutoff specifications for applicable engine. |
| • | Engine should not accelerate beyond calibrated RPM value. |
| • | Release throttle immediately if value is exceeded. |
| • | DO NOT apply brake pedal. |
| • | Cycle ignition from OFF to ON. |
| • | Apply and hold brake pedal. |
| • | Vehicle must remain in Park or Neutral. |
| • | 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) sensors 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:
| • | Release when fuel cutoff occurs. |
- The scan tool displays Learn Status: Learned this ignition. If the scan
tool indicates that DTC P1336 ran and passed, the CKP variation learn procedure
is complete. If the scan tool indicates DTC P1336 failed or did not run,
refer to
DTC P1336
. If any other DTCs set,
refer to
Diagnostic Trouble Code (DTC) List
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 P1336
is set:
| • | A harmonic balancer replacement |
| • | Any engine repairs which disturb the crankshaft to CKP sensor relationship |
