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Home >> Ford >> 2008 >> Edge Limited, 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 E: The Tachometer Is Inoperative

Pinpoint Test E: The Tachometer Is Inoperative

Normal Operation 

The PCM uses the crankshaft position (CKP) sensor to measure the engine RPM, and sends the instrument cluster (IC) data over the high speed controller area network (HS-CAN) communication bus, to command the tachometer gauge according to the data.

If the instrument cluster (IC) does not receive the engine RPM data from the PCM for 5 seconds or less, the instrument cluster (IC) defaults the tachometer to the last setting, based upon the last known good RPM message. If the instrument cluster (IC) does not receive the engine RPM data from the PCM for more than 5 seconds or if the data received is deemed invalid, the instrument cluster (IC) sets DTC U0100 in continuous memory and defaults the tachometer to 0 RPM.

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

This pinpoint test is intended to diagnose the following:

PINPOINT TEST E: THE TACHOMETER IS INOPERATIVE 

  1. E1 CARRY OUT THE INSTRUMENT CLUSTER (IC) TACHOMETER 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) tachometer (TACH) active command and command the tachometer on. Observe the tachometer. The tachometer should start at 0 and move to 7,000 RPM.
    • Does the tachometer sweep from 0 to 7,000 RPM when commanded on? 
    1. YES  : Go to  E2.
    2. NO  : Go to  E5.
  2. E2 RETRIEVE THE RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND PCM SELF-TESTS 
    • Check for recorded PCM DTCs from the continuous and on-demand self-tests.
    • Are any PCM DTCs recorded? 
    1. YES  : REFER to the Introduction - Gasoline Engines article.
    2. NO  : Go to  E3.
  3. E3 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  E4.
  4. E4 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.
  5. E5 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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