Pinpoint Test C: Flash Code 3 - DEACTIVATOR Switch Or Circuit Failure

WARNING: This page is about a different car, the 2005 Mercury Sable and 2005 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.

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.
  
  Fig 1: Measuring Voltage Between Speed Control Actuator C122 Pin 9, Circuit 248 (TN/OG), Harness Side And Speed Control Actuator C122 Pin 10, Circuit 57 (BK), Harness Side
  Courtesy of FORD MOTOR CO.
- 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.
  
  Fig 2: Measuring Voltage Between Deactivator Switch C277 Pin 2, Circuit 10 (LG/RD), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- 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.
  
  Fig 3: Measuring Resistance Between Speed Control Actuator C122 Pin 9, Circuit 248 (TN/OG), Harness Side And Deactivator Switch C277 Pin 1, Circuit 248 (TN/OG), Harness Side
  Courtesy of FORD MOTOR CO.
- 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.