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Home >> Lincoln >> 2008 >> MKX FWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Information Center >> Diagnostic Tests >> Instrument Cluster (IC), Message Center and Warning Chimes >> Pinpoint Tests >> Pinpoint Test U: The Speed Control Indicator Is Never/Always On

Pinpoint Test U: The Speed Control Indicator Is Never/Always On

Normal Operation 

The instrument cluster (IC) receives the speed control signal from the PCM over the high speed controller area network (HS-CAN) communication bus. When the speed control is engaged, the PCM sends a message to the instrument cluster (IC) to illuminate the speed control indicator. If the speed control message is missing or if the data is deemed invalid by the instrument cluster (IC) for more than 5 seconds, the instrument cluster (IC) sets DTC U0100 in continuous memory and defaults the speed control off.

NOTE: If DTC U0100 is set in the instrument cluster (IC), other observable symptoms may be an inoperative speedometer, tachometer or odometer.

This pinpoint test is intended to diagnose the following:

PINPOINT TEST U: THE SPEED CONTROL INDICATOR IS NEVER/ALWAYS ON 

  1. U1 CHECK THE SPEED CONTROL OPERATION 
    • Test drive the vehicle and operate the speed control.
    • Does the speed control operate correctly? 
    1. YES  : Go to  U2.
    2. NO  : REFER to SPEED CONTROL article.
  2. U2 CARRY OUT THE INSTRUMENT CLUSTER (IC) INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster (IC) DataLogger
    • Select the instrument cluster (IC) all lamps (ALL_LAMP) active command mode and command all the lamps on and off. Observe the speed control indicator.
    • Does the speed control indicator illuminate when commanded on, and turn off when commanded off? 
    1. YES  : Go to  U3.
    2. NO  : Go to  U5.
  3. U3 RETRIEVE THE RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND INSTRUMENT CLUSTER (IC) SELF-TESTS 
    • Check for recorded instrument cluster (IC) DTCs from the continuous and on-demand self-tests.
    • Is DTC U0100 recorded? 
    1. YES  : Go to Pinpoint Test AG  .
    2. NO  : Go to  U4.
  4. U4 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 determine if 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.
  5. U5 CHECK FOR CORRECT INSTRUMENT CLUSTER (IC) OPERATION 
    • Disconnect the instrument cluster (IC) connector.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect the instrument cluster (IC) connector and make sure it seats correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new instrument cluster (IC). REFER to Instrument Cluster (IC) . 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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