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Pinpoint Test A: The Speed Control Is Inoperative

Refer to appropriate SYSTEM WIRING DIAGRAMS - EDGE or SYSTEM WIRING DIAGRAMS - MKX article, Speed Control for schematic and connector information.

Normal Operation 

The PCM sends a signal through circuit VES10 (WH) to the speed control switches, which passes through the clockspring. The return signal is sent to the PCM through circuit RES08 (GN/BN) and the clockspring. When the brake pedal is applied, the SJB sends a message to the PCM to deactivate the speed control if engaged.

The speed control deactivator switch (part of the stoplamp switch) interrupts circuit CES09 (VT/OG) removing the voltage signal to the PCM when the brake pedal is applied. This is a redundant signal to the PCM.

This pinpoint test is intended to diagnose the following:

PINPOINT TEST A: THE SPEED CONTROL IS INOPERATIVE 

CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. A1 VERIFY 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 article to carry out PCM programmable module installation (PMI).
  2. A2 RETRIEVE THE RECORDED PCM DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND SELF-TESTS 
    • Review the recorded DTCs from the PCM self-test.
    • Are any non-speed control DTCs recorded? 
    1. YES  : REFER to the Introduction - Gasoline Engines article. REPAIR all PCM DTCs and RETEST the speed control.
    2. NO  : Go to  A3.
  3. A3 CHECK THE SPEED CONTROL COMMAND SWITCH (SCCS) PID 
    • Start the engine.
    • Enter the following diagnostic mode on the diagnostic tool: PCM DataLogger
    • With the engine running, monitor the PCM SCCS PID while pressing the speed control switches as follows:
      Speed Control Switch PID Minimum Value PID Maximum Value
      OFF 0.00 volts 1.089 volts
      SET - 2.192 volts 3.057 volts
      SET + 3.057 volts 3.721 volts
      RESUME 3.721 volts 4.209 volts
      ON 4.209 volts 4.556 volts
      No switch pressed 4.556 volts 4.839 volts
    • Are the PCM SCCS PID values OK? 
    1. YES  : TURN the engine off. Go to  A5.
    2. NO  : TURN the engine off. Go to  A4.
  4. A4 CHECK THE SPEED CONTROL SWITCH 
    • Key in OFF position.
    • Disconnect: PCM C175b
      • Fig 1: Measuring Resistance
      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  : Go to  A8.
    2. NO  : INSTALL a new speed control switch. REFER to SPEED CONTROL SWITCH . TEST the system for normal operation.
  5. A5 CHECK THE STOPLAMP SWITCH (BOO) PID 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: PCM DataLogger
    • 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  A6.
    2. NO  : Go to Pinpoint Test B .
  6. A6 CHECK THE DIGITAL TRANSMISSION RANGE (TR) SENSOR PID 
    • Connect: PCM C175b
    • Apply the parking brake.
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: PCM DataLogger
    • 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 - 6F50 article to diagnose the digital TR sensor.
  7. A7 CHECK THE VEHICLE SPEED 
    NOTE: This step may require an assistant.
    • Enter the following diagnostic mode on the diagnostic tool: ABS Control Module DataLogger
    • Monitor and record the ABS LF_WSPD 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 DataLogger
    • Monitor and record the PCM VSS (vehicle speed) PID while driving the vehicle at 48 km/h (30 mph).
    • Does the speed indicated by the ABS control module wheel speed PID match the PCM VSS PID? 
    1. YES  : Go to  A8.
    2. NO  : REFER to the Introduction - Gasoline Engines article to diagnose the output shaft speed (OSS) sensor signal.
  8. A8 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 article. 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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