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 C: Flash Code 3 - DEACTIVATOR Switch Or Circuit Failure
2005 Ford Taurus SEL, 4D SedanSECTION Pinpoint Test C: Flash Code 3 - DEACTIVATOR Switch Or Circuit Failure
- C1 CHECK THE DEACTIVATOR SWITCH CIRCUITRY
- Key in OFF position.
- Disconnect: Speed Control Actuator C122.
- Measure the voltage between the speed control actuator C122 pin 9, circuit 248 (TN/OG), harness side and the speed control actuator C122 pin 10, circuit 57 (BK), harness side.
- Is the voltage greater than 10 volts?
- Yes : INSTALL a new speed control actuator. REFER to SPEED CONTROL ACTUATOR . TEST the system for normal operation.
- No : GO to C2.
- C2 CHECK CIRCUIT 10 (LG/RD) FOR AN OPEN
- Disconnect: Deactivator Switch C227.
- Measure the voltage between the deactivator switch C277 pin 2, circuit 10 (LG/RD), harness side and ground.
- Is the voltage greater than 10 volts?
- Yes : GO to C3.
- No : REPAIR the circuit. TEST the system for normal operation.
- C3 CHECK CIRCUIT 248 (TN/OG) FOR AN OPEN
- Measure the resistance between the speed control actuator C122 pin 9, circuit 248 (TN/OG), harness side and the deactivator switch C277 pin 1, circuit 248 (TN/OG), harness side.
- Is the resistance less than 5 ohms?
- Yes : INSTALL a new deactivator switch. REFER to SPEED CONTROL DEACTIVATOR SWITCH . TEST the system for normal operation.
- No : REPAIR the circuit. TEST the system for normal operation.
RENDER: 1.0x
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.