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Pinpoint Test B: Flash Code 2 - STOPLAMP Switch Or Circuit Failure

CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.
  1. B1 CHECK THE STOPLAMP OPERATION 
    • Press the brake pedal.
    • Do the stoplamps come on? 
    1. YES  : Go to  B2.
    2. NO  : REFER to EXTERIOR LIGHTING article to continue diagnosis of the stoplamps.
  2. B2 CHECK CIRCUIT 810 (RD/LG) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: Speed Control Actuator C122
    • Key in ON position.
      • Fig 1: Checking Circuit For Voltage
      GF0020590Courtesy of FORD MOTOR CO.
    • Measure the voltage between the speed control actuator C122-4, circuit 810 (RD/LG), harness side, and the speed control actuator C122-10, circuit 57 (BK), harness side.
    • Is any voltage indicated? 
    1. YES  : REPAIR the circuit. TEST the system for normal operation.
    2. NO  : Go to  B3.
  3. B3 CHECK CIRCUIT 810 (RD/LG) FOR AN OPEN 
      Fig 2: Checking Circuit For Voltage
      GF0020590Courtesy of FORD MOTOR CO.
    • Measure the voltage between the speed control actuator C122-4, circuit 810 (RD/LG), harness side, and the speed control actuator C122-10, circuit 57 (BK), harness side, while pressing the brake pedal.
    • Is the voltage greater than 10 volts? 
    1. YES  : INSTALL a new speed control actuator. REFER to Speed Control Actuator . TEST the system for normal operation.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
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