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Pinpoint Test A: The Speed Control Is Inoperative

WARNING: This page is about a different car, the 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.

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

Normal Operation 

The PCM sends a signal through circuit 151 (LB/BK) to the speed control switch which passes through the clockspring. Ground for the signal is provided through circuit 848 (DG/OG) and the clockspring.

This pinpoint test is intended to diagnose the following: 

PINPOINT TEST A: THE SPEED CONTROL IS INOPERATIVE 

NOTE: 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 GENERAL PROCEDURES article to carry out PCM programmable module installation (PMI). TEST the system for normal operation.
  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 DTCs recorded? 
    1. YES  : REFER to DTC Index .
    2. NO  : Go to  A3.
  3. A3 CHECK STOPLAMP SWITCH INPUT TO THE ABS MODULE 
    • Enter the following diagnostic mode on the diagnostic tool: ABS DataLogger
    • Monitor the ABS BOO_ABS (brake pedal position switch) PID while applying and releasing the brake pedal.
    • Do the PIDs agree with the stoplamp switch position? 
    1. YES  : Go to  A4.
    2. NO  : REFER to VEHICLE DYNAMIC SYSTEMS article.
  4. A4 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  A5.
    2. NO  : If only one switch does not display the correct PID value, INSTALL a new speed control switch. REFER to Speed Control Switch . TEST the system for normal operation.

      Otherwise, go to Pinpoint Test C .

  5. A5 CHECK THE DIGITAL TR SENSOR (TR) PID 
    • 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  A6.
    2. NO  : REFER to DIAGNOSTIC TESTS article to continue diagnosis of the digital TR sensor.
  6. A6 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  : INSTALL a new PCM. REFER to REMOVAL & INSTALLATION 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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