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.
Powertrain Control Module
PCM receives information from various input devices and uses this information to control solenoids on transaxle valve body for transaxle shifting, shift feel and TCC engagement.
In "D" range, PCM automatically switches driving mode from NORMAL mode to POWER mode depending on driving conditions. PCM will also automatically switch driving mode from NORMAL mode to SLOPE mode to prevent excessive up and downshifts when climbing or descending hills. PCM shift control detects engine load and vehicle speed and chooses optimum gear to be in according to PCM programming.
PCM monitors transaxle operation and contains a self-diagnostic system which will store Diagnostic Trouble Codes (DTC) if a failure or problem exists in electronic control system. If a problem exists, a DTC is set and PCM will deliver a signal to illuminate Malfunction Indicator Light (MIL), and/or O/D OFF indicator on instrument panel to warn driver. If either MIL or O/D OFF indicators are illuminated, stored DTCs can be retrieved to determine problem area. See DIAGNOSIS & TESTING . PCM is located under center of instrument panel, in front of center console.
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.
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