Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Crankshaft Position Variation Learn Procedure
- Start engine and allow ECT to reach more than 158°F (70°C).
- Turn A/C off and place transaxle in Park or Neutral.
- Using scan tool, perform CRANKSHAFT POS. VARIATION LEARN procedure.
Procedure requires accelerator to be depressed to wide open throttle and then released. PCM will cut fuel off at speeds more than 4000 RPM and will allow engine to decelerate. PCM will learn crankshaft as engine decelerates.
If PCM will not learn crankshaft, see EXCESSIVE CRANKSHAFT VARIATION SYMPTOM table for diagnostic aids.
| Scan Tool Display | Possible Causes |
|---|---|
| Factors Out Of Range | Reluctor Wheel Machining Quality, Run Out, Incorrect Air Gap |
| Opposing Factors Out Of Range | Disturbance Or Noise In Crank Sensor Circuit |
| Sum Out Of Range | Engine Too Cold |
| Crank Pulse Count Error | CKP Or CMP Sensor DTC Set |
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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