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
The cruise control system uses the PCM to maintain desired vehicle cruise speed. PCM controls fuel injection pump that is mounted on top of the engine under the intake manifold. PCM also monitors vehicle speed and cruise control operation. The fuel injection pump operates in response to accelerator control system. The accelerator control system consists of an Accelerator Pedal Position (APP) module. APP module sends signals to the PCM that control the fuel injection pump. The PCM assembly contains a low speed limit which will prevent system engagement with vehicle speed less than 25 MPH.
PCM will inhibit cruise control under the following conditions:
- Vehicle speed is less than 25 MPH.
- Selector lever is in Park, Reverse, Neutral, or Low position.
- Low engine RPM.
- High engine RPM (fuel cut-off).
- Vehicle speed is too high.
- An over or under charged battery voltage condition exists.
- Anti-lock brake system/traction control system is active for more than 2 seconds.
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.