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Pinpoint Test G: Flash Code 2 - STOPLAMP Switch 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. G1 CHECK THE STOPLAMP SWITCH OPERATION 
    • Apply and release the brake pedal while observing the stoplamps.
    • Do the stoplamps operate correctly? 
    1. YES  : Go to  G2.
    2. NO  : REFER to EXTERIOR LIGHTING article to continue diagnosis of the stoplamps.
  2. G2 CHECK CIRCUIT 15S-PG17 (GN/BU)  
    • Key in OFF position.
    • Disconnect: Speed Control Actuator C122
    • Key in ON position.
      • Fig 1: Measuring Voltage
      GF0040265Courtesy of FORD MOTOR CO.
    • Measure the voltage between the speed control actuator C122-4, circuit 15S-PG17 (GN/BU), harness side and the speed control actuator C122-10, circuit 91-PG12 (BK/WH), harness side while applying 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  : For vehicles equipped with an automatic transaxle, REPAIR circuit 15S-PG17 (GN/BU). TEST the system for normal operation.

      For vehicles equipped with a manual transaxle, go to  G3.

  3. G3 CHECK THE CPP SWITCH FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: CPP Switch C257
      • Fig 2: Measuring Resistance
      GF0040263Courtesy of FORD MOTOR CO.
    • Measure the resistance between the CPP switch C257 pin 1, component side and the CPP switch C257 pin 3, component side with the clutch pedal applied and then released.
    • Is the resistance less than 5 ohms with the clutch pedal applied and greater than 10,000 ohms with the clutch pedal released? 
    1. YES  : Go to  G4.
    2. NO  : INSTALL a new CPP switch. REFER to CLUTCH CONTROLS article. TEST the system for normal operation.
  4. G4 CHECK CIRCUIT 15S-PG17 (GN/BU) FOR AN OPEN BETWEEN THE SPEED CONTROL ACTUATOR AND THE CPP SWITCH 
      Fig 3: Measuring Resistance
      GF0040266Courtesy of FORD MOTOR CO.
    • Measure the resistance between the speed control actuator C122-4, circuit 15S-PG17 (GN/BU), harness side and the CPP switch C257-1, circuit 15S-PG17 (GN/BU), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : REPAIR circuit 15S-PG7 (GN/BU). TEST the system for normal operation.
    2. NO  : REPAIR circuit 15S-PG17 (GN/BU). TEST the system for normal operation.
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