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.
Engine Control Module
ECM receives information from various input devices and uses this information to control shift solenoids on transmission valve body for transmission shifting and lock-up solenoid (also called SLU solenoid) for torque converter lock-up. ECM contains a self-diagnostic system, which will store Diagnostic Trouble Codes (DTC) if a failure or problem exists in electronic control system. Trouble codes can be retrieved to determine problem area. See SELF DIAGNOSTIC SYSTEM . For ECM locations, see Figure-Figure .
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Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.