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.
Normal Operation
The speed control actuator receives signals from the speed control switches through circuits VES10 (WH) and RES08 (GN/BN). Voltage to the speed control actuator is supplied through circuit CBB35 (YE/GY) from the smart junction box (SJB). Ground for the speed control actuator is through circuit GD120 (BK/GN).
Voltage for the speed control servo clutch (internal to the speed control actuator) is supplied by the SJB to the speed control deactivator switch through circuit CBP34 (VT/BN). The speed control deactivator switch (closed when the brake pedal is not applied) then routes the voltage through circuit CES09 (VT/OG) to the speed control actuator. When the brake pedal is firmly pressed, the speed control deactivator switch opens and voltage is no longer supplied to the speed control servo clutch.
When the brake pedal is applied, the stoplamp switch routes voltage to circuit CCB08 (VT/WH) to illuminate the stoplamps and send a voltage signal to the speed control actuator. When the speed control actuator receives this input, the speed control actuator goes into a stand-by mode.
The speed control actuator sends a voltage reference signal through circuit CET21 (GN/WH). The speed control system will not engage if circuit CET21 (GN/WH) is grounded, and goes into a stand-by mode if the speed control system has a set speed that it is maintaining. When the transaxle is placed in NEUTRAL (N) (automatic transaxle), the digital transmission range (TR) sensor routes the signal to ground through circuit GD120 (BK/GN). When the clutch is applied (manual transaxle), the clutch pedal position switch (CPP) routes the signal to ground through circuit RE407 (YE/VT) and then to the PCM. The PCM provides a ground internally for this circuit.
The speed control actuator receives the speed signal from the PCM through circuit VMC05 (VT/OG).
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- CPP switch
- TR sensor
- Speed control deactivator switch
- Speed control cable
- Throttle body linkage
- Speed control switches
- Clockspring
- Speed control actuator
- SJB
- PCM
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.