Pinpoint Test B: Flash Code 2 - Brake Pedal Position (BPP) 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.

B1 CHECK THE STOPLAMP OPERATION
- Press the brake pedal.
- Do the stoplamps come on?
- Yes : GO to B2.
- No : REFER to EXTERIOR LIGHTING to continue diagnosis of the stoplamps.
B2 CHECK CIRCUIT 810 (RD/LG) FOR SHORT TO POWER
- Key in OFF position.
- Disconnect: Speed Control Actuator C122.
- Key in ON position.
- Measure the voltage between the speed control actuator C122 pin 4, circuit 810 (RD/LG), 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 4, Circuit 810 (RD/LG), Harness Side, And Speed Control Actuator C122 Pin 10, Circuit 57 (BK), Harness Side
  Courtesy of FORD MOTOR CO.
- Is any voltage indicated?
- Yes : REPAIR the circuit. TEST the system for normal operation.
- No : GO to B3.
B3 CHECK CIRCUIT 810 (RD/LG) FOR AN OPEN
- Measure the voltage between the speed control actuator C122 pin 4, circuit 810 (RD/LG), harness side, and the speed control actuator C122 pin 10, circuit 57 (BK), harness side, while pressing the brake pedal.
  
  Fig 2: Measuring Voltage Between Speed Control Actuator C122 Pin 4, Circuit 810 (RD/LG), 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 : REPAIR the circuit. TEST the system for normal operation.