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.
Failure Conditions
PCM turns on MIL. PCM calculates transaxle input speed based on output speed and gear ratio of gear commanded. PCM calculates slip speed from calculated input speed and engine RPM. TCC engaged and garage shift adapts are maintained at current levels. Torque management is disabled.
- With engine idling in Park or Neutral, PCM data PD72 should read 50-100 RPM less than engine RPM.
- Transaxle input speed sensor should generate a frequency of greater than zero Hertz with engine at idle. If frequency is not as specified, check circuits No. 1230 and 1231 and speed sensor for open or short inside transaxle.
- Checks circuits No. 1230 and 1231 for open or short to PCM. If circuit is okay, PCM is faulty.
NO RELATED
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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.