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.
Electronic Control Module (ECM) & Cruise Control Module
The ECM/cruise control module interprets the position of the servo, mode control switches and output of the Vehicle Speed Sensor (VSS). In response to these inputs, the module signals the opening or closing of the vent and vacuum solenoid valves in the servo. To determine whether cruise control is controlled by an ECM or cruise control module, see appropriate wiring diagram in WIRING DIAGRAM section.
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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.