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.
Theory Of Operation
The purpose of the diagnostic is to monitor the positive engine torque request calculation in the Transmission Control Module (TCM) and the engine response resulting from the positive engine torque request. This diagnostic includes, comparison of the calculated torque request versus commanded torque request. The rationality of the actual crankshaft torque signal received from the Powertrain Control Module (PCM). The rationality of the actual input and output speed gradient of the transmission. The comparison of two torque request signals that are managed separately in the software which come after the torque request calculation but before the torque request is sent to the TCM.
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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.