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Home >> Pontiac >> 1992 >> Trans Sport SE, 3.8 L >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Testing >> Speedometer/Odometer >> Speedometer Inoperative Or Inaccurate (3.8L)

Speedometer Inoperative Or Inaccurate (3.8L)

  1. If PCM Code 24 is set, see appropriate G -TESTS W/CODES article in the ENGINE PERFORMANCE Section. If PCM Code 24 is not set, disconnect Orange (or Green) 32-cavity connector from PCM. Connect Instrument Panel Tester (J 33431-B) to terminal D7 (Dark Green wire) of PCM connector.
  2. Set tester to 54 MPH. Turn ignition switch to RUN position. If speedometer does not indicate 54 MPH, go to next step. If speedometer indicates 54 MPH, check for poor connection at PCM connector. If connection is okay, replace PCM.
  3. Check for open, short to ground or short to voltage in Dark Green wire, or poor connection at instrument cluster connector. If wire and connection are okay, replace instrument cluster.
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