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.
Pinpoint Test A: The Speed Control Is Inoperative - No Flash Codes
Refer to appropriate SYSTEM WIRING DIAGRAMS article, Speed Control for schematic and connector information.
Normal Operation
The speed control actuator sends and receives signals to the speed control switches through circuits VES10 (WH) and RES08 (GN/BN). Voltage to the speed control actuator is supplied through circuit CBP20 (YE/VT) from the smart junction box (SJB). Ground for the speed control actuator is through circuit GD123 (BK/GY).
When the brake pedal is applied, the stoplamp switch routes voltage through circuit CCB15 (BN/GN), sending 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 clutch pedal position (CPP) switch, if equipped, is normally closed. When the clutch is applied, ground is removed from circuit CCB15 (BN/GN) to the speed control actuator, and the actuator goes into a stand-by mode.
The speed control deactivator switch (closed when the brake pedal is not applied) routes 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 actuator.
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(s)
- Wiring, terminals or connectors
- Stoplamp switch
- CPP switch (manual transmission)
- Speed control deactivator switch
- Speed control cable
- Throttle body linkage
- Clockspring
- Speed control switch
- Speed control actuator
- SJB
- PCM
PINPOINT TEST A: THE SPEED CONTROL IS INOPERATIVE - NO FLASH CODES
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.