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Pinpoint Test A: The Speed Control Is Inoperative

WARNING: This page is about a different car, the 2008 Ford RV Cutaway, 2008 Ford Econoline, 2008 Ford E450 Super Duty, and 2008 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
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.
  2. A2 RETRIEVE THE RECORDED PCM DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND SELF-TESTS 
    • Check for recorded PCM DTCs from the continuous and on-demand self-tests.
    • Are any non-speed control DTCs recorded? 
    1. YES  : REFER to the appropriate Engine Performance article. REPAIR all PCM DTCs and RETEST the speed control.
    2. NO  : Go to  A3.
  3. A3 CHECK THE BRAKE WARNING INDICATOR 
    • Key in ON position.
    • While observing the brake warning indicator, apply and release the parking brake.
    • Does the brake warning indicator operate correctly? 
    1. YES  : Go to  A4.
    2. NO  : REFER to INSTRUMENT CLUSTER (IC) AND WARNING CHIMES article.
  4. A4 CHECK THE VEHICLE SPEED 
    NOTE: This step may require an assistant.
    • Enter the following diagnostic mode on the diagnostic tool: ABS 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 PID while driving the vehicle at 48 km/h (30 mph).
    • Does the speed indicated by the ABS LF_WSPD PID match the PCM VSS PID? 
    1. YES  : Go to  A5.
    2. NO  : REFER to the appropriate Engine Performance article to diagnose the output shaft sensor (OSS) signal.
  5. A5 CHECK THE SPEED CONTROL SWITCH 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: PCM DataLogger
    • Press each speed control switch button while monitoring the SCCS (speed control switch) PID.
    • Does the PID value agree with the switch position? 
    1. YES  : Go to  A6 .
    2. NO  : If only one switch does not display the correct PID value, INSTALL a new speed control switch. REFER to Speed Control Switch . CLEAR the DTCs. TEST the system for normal operation.

      Otherwise, go to Pinpoint Test C .

  6. A6 CHECK THE DIGITAL TRANSMISSION RANGE (TR) SENSOR PID 
    • Connect: PCM C175b (Gasoline) or C1381b (Diesel)
    • 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 - 4R70E/4R75E article or AUTOMATIC TRANSAXLE/TRANSMISSION - TORQSHIFT article to continue diagnosis of the digital TR sensor.
  7. A7 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 are seated correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : Go to Pinpoint Test B .
    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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