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Pinpoint Test A: The Speed Control Is Inoperative

CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.
  1. A1 VERIFY POWERTRAIN CONTROL MODULE (PCM) CONFIGURATION 
    • Enter the following diagnostic mode on the diagnostic tool: Programmable Parameters
    • Verify that the speed control is enabled in the PCM.
    • Is the speed control enabled? 
    1. YES  : Go to  A2.
    2. NO  : ENABLE the speed control in the PCM using the scan tool programmable parameters menu. If no parameter exists, REFER to MODULE CONFIGURATION to carry out PCM programmable module installation (PMI). TEST the system for normal operation.
  2. A2 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCs) 
    • Review the recorded DTCs from the PCM self-test.
    • Are any DTCs recorded? 
    1. YES  : REFER to the Powertrain Control Module (PCM) Diagnostic Trouble Code (DTC) Index for correct diagnosis.
    2. NO  : Go to  A3.
  3. A3 CHECK THE STOPLAMP SWITCH 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: PCM Stoplamp Switch PID BOO
    • Monitor the PCM BOO PID.
    • Apply and release the brake pedal.
    • Does the PID value agree with the brake pedal position? 
    1. YES  : Go to  A4.
    2. NO  : Go to Pinpoint Test B .
  4. A4 CHECK THE CPP SWITCH 
    • Enter the following diagnostic mode on the diagnostic tool: PCM CPP Switch PID
    • Monitor the PCM CPP switch PID.
    • Apply and release the clutch pedal.
    • Does the PID value agree with the clutch pedal position? 
    1. YES  : Go to  A5.
    2. NO  : Go to Pinpoint Test D .
  5. A5 CHECK THE SPEED CONTROL SWITCH 
    • Key in OFF position.
    • Disconnect: PCM C175b
      • Fig 1: Checking Speed Control Switch
      GF0023014Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM C175b-56, circuit VES10 (WH), harness side and the PCM C175b-57, circuit RES08 (GN/BN), harness side while pressing the speed control switches as follows:
      Speed Control Switch Resistance Value
      OFF Less than 5 ohms
      SET - 298 - 304 ohms
      SET + 596 - 608 ohms
      RESUME 1,101 - 1,123 ohms
      ON 2,091 - 2,133 ohms
      No switch pressed 4,279 - 4,363 ohms
    • Are the speed control switch resistance values OK? 
    1. YES  : For automatic transaxle, go to  A4 .

      For manual transaxle, go to  A6 .

    2. NO  : INSTALL a new speed control switch. REFER to Speed Control Switch . TEST the system for normal operation.
  6. A6 CHECK THE DIGITAL TR SENSOR 
    • Connect: PCM C175b
    • Apply the parking brake.
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: PCM TR Sensor PID TR
    • Monitor the PCM TR PID.
    • Select DRIVE.
    • Does the PID value agree with the transmission range selector lever position? 
    1. YES  : Go to  A7.
    2. NO  : REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - 6 SPEED to diagnose the digital TR sensor.
  7. A7 CHECK THE DIGITAL TR SENSOR FOR CORRECT ALIGNMENT 
    1. YES  : Go to  A8.
    2. NO  : ADJUST the digital TR sensor. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - 6 SPEED . TEST the system for normal operation.
  8. A8 CHECK THE VEHICLE SPEED 
    NOTE: This step may require an assistant.
    • Enter the following diagnostic mode on the diagnostic tool: Anti-lock Brake System (ABS) Wheel Speed PID
    • Monitor and record the ABS module wheel speed PID while driving the vehicle at 48 km/h (30 mph) as indicated on the speedometer.
    • Enter the following diagnostic mode on the diagnostic tool: PCM Vehicle Speed PID VSS
    • Monitor and record the PCM VSS PID while driving the vehicle at 48 km/h (30 mph).
    • Does the speed indicated by the ABS module wheel speed PID match the PCM VSS PID? 
    1. YES  : Go to  A9.
    2. NO  : REFER to the Introduction - Gasoline Engines to diagnose the output shaft speed (OSS) sensor signal.
  9. A9 CHECK FOR CORRECT PCM OPERATION 
    • Disconnect all the PCM connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the PCM connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS - 2.3L or ELECTRONIC ENGINE CONTROLS - 3.0L (4V) . TEST the system for normal operation.
    2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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