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PINPOINT TEST A: THE SPEED CONTROL IS INOPERATIVE - NO DTCs

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. 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 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 article to carry out PCM programmable module installation (PMI). TEST the system for normal operation.
  2. A2 CHECK FOR 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 in this article.
    2. NO  : Go to  A3.
  3. A3 CHECK THE PARKING BRAKE WARNING INDICATOR 
    • Key in ON position.
    • While observing the parking brake warning indicator, apply and release the parking brake.
    • Does the parking brake warning indicator operate correctly? 
    1. YES  : Go to  A4.
    2. NO  : REFER to INSTRUMENT CLUSTER article.
  4. A4 CHECK THE SPEED CONTROL SWITCH 
    • Key in OFF position.
    • Disconnect: PCM C175b
    • Measure the resistance between the PCM C175b-56, circuit 151 (LB/BK), harness side and the PCM C175b-57, circuit 848 (DG/OG), harness side.
      Speed Control Switch Resistance Value
      OFF Less than 5 ohms
      COAST 276-324 ohms
      SET/ACCEL 552-648 ohms
      RESUME 1,021-1,199 ohms
      ON 1,941-2,278 ohms
      No switch pressed 3,965-4,655 ohms
      • Fig 1: Checking Speed Control Switch
      GF0004244Courtesy of FORD MOTOR CO.
    • Are the speed control switch resistance values OK? 
    1. YES  : If equipped with an automatic transmission, go to  A5 .

      If equipped with a manual transmission, go to  A7.

    2. NO  : INSTALL a new speed control switch. REFER to Speed Control Switch - Without Remote Audio/Climate Controls  or Speed Control Switch - With Remote Audio/Climate Controls  in this article. TEST the system for normal operation.
  5. A5 CHECK THE DIGITAL TR SENSOR 
    • Connect: PCM C175b
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: PCM TR Sensor PID
    • Monitor the PCM TR PID.
    • Select DRIVE.
    • Does the PCM TR PID value agree with the transmission range selector lever position? 
    1. YES  : Go to  A6.
    2. NO  : REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - 4R70E/4R75E article.
  6. A6 CHECK THE DIGITAL TR SENSOR FOR CORRECT ALIGNMENT 
    1. YES  : Go to  A7.
    2. NO  : ADJUST the digital TR sensor. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - 4R70E/4R75E article. TEST the system for normal operation.
  7. A7 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) Module Wheel Speed PID
    • 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 Vehicle Speed PID
    • 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  : If equipped with an automatic transmission, go to  A11 .

      If equipped with a manual transmission, go to  A8 .

    2. NO  : REFER to the INTRODUCTION - GASOLINE ENGINES article to continue diagnosis of the output shaft sensor (OSS) signal.
  8. A8 CHECK THE PCM CPP SWITCH PID 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: PCM CPP Switch PID
    • Monitor the PCM CPP_TOP PID while pressing and releasing the clutch pedal.
    • Does the PCM CPP_TOP agree with the clutch pedal position? 
    1. YES  : Go to  A11.
    2. NO  : Go to  A9.
  9. A9 CHECK CIRCUIT 570 (BK/WH) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: CPP Switch C257
    • For early build vehicles, measure the resistance between the CPP switch C257-4, circuit 570 (BK/WH), harness side and ground.
      Fig 2: Checking Circuit 570 (BK/WH) For Open (For Early Build Vehicles)
      GF0004245Courtesy of FORD MOTOR CO.
    • For late build vehicles, measure the resistance between the CPP switch C257-3, circuit 570 (BK/WH), harness side and ground.
      Fig 3: Checking Circuit 570 (BK/WH) For Open (For Late Build Vehicles)
      GF0004246Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  A10.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  10. A10 CHECK CIRCUIT 306 (TN/LB) FOR AN OPEN OR A SHORT TO GROUND 
    • Disconnect: PCM C175b
    • For early build vehicles, measure the resistance between the PCM C175b-38, circuit 306 (TN/LB), harness side and the CPP switch C257-3, circuit 306 (TN/LB), harness side; and between the PCM C175b-38, circuit 306 (TN/LB), harness side and ground.
      Fig 4: Checking Circuit 306 (TN/LB) For Open Or Short To Ground (For Early Build Vehicles)
      GF0004247Courtesy of FORD MOTOR CO.
    • For late build vehicles, measure the resistance between the PCM C175b-38, circuit 306 (TN/LB), harness side and the CPP switch C257-4, circuit 306 (TN/LB), harness side; and between the PCM C175b-38, circuit 306 (TN/LB), harness side and ground.
      Fig 5: Checking Circuit 306 (TN/LB) For Open Or Short To Ground (For Late Build Vehicles)
      GF0004248Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the PCM and the CPP switch, and greater than 10,000 ohms between the PCM and ground? 
    1. YES  : INSTALL a new CPP switch. REFER to ELECTRONIC ENGINE CONTROLS article. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  11. A11 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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