Crankshaft Position (CKP) - Variation Learn Procedure

^ If a crankshaft or PCM has been replaced, the crankshaft must be relearned.
^ Make sure no cam or crankshaft DTCs are set before the crankshaft notch variation is learned.

Using Scan tool, perform the CRANKSHAFT POS. VARIATION LEARN procedure.

CRANKSHAFT POSITION VARIATION LEARN PROCEDURE (STEPS 1 - 3)
1. Start engine and allow ECT to reach at least 70°C (158°F).
2. Turn A/C Off and place transaxle in Park or Neutral.
3. Using Scan tool, perform CRANKSHAFT POS. VARIATION LEARN procedure.

CRANKSHAFT POSITION VARIATION PROCEDURE EXPLAINED
When the procedure is initiated, the Scan tool will send a message to the PCM to enable crank learn.

IMPORTANT: The PCM will only learn the crankshaft when the procedure is performed with a Scan tool.

When the engine coolant temperature is above 70°C (158°F) with the A/C request Off and the transaxle in Park or Neutral, the PCM will be ready to learn the crankshaft notch variation. The accelerator will now have to be manually depressed to wide-open throttle and released. The PCM will cut fuel off above 4000 RPM and will allow the engine to decelerate. The PCM will learn the crankshaft as the engine decelerates.

If the PCM will not learn the crankshaft, the following are some diagnostic aids that may help to complete the learn procedure: