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Speedometer Inoperative

  1. Disconnect Powertrain Control Module (PCM) Blue 80-pin connector C1. Connect Signal Generator Instrument Panel Tester (J-33431-B) to PCM harness connector C1, terminal No. 55 (Dark Green/White wire). Connect tester ground terminal to a good chassis ground. Set tester to 54 MPH. Turn ignition switch to RUN position. If speedometer reads 54 MPH, go to next step. If speedometer does not read 54 MPH, go to step 3).
  2. Check for poor terminal contact at PCM connector C1, terminal No. 55 (Dark Green/White wire). Check for poor terminal contact at Black 66-pin connector C101 (body-to-engine wiring harness, located at right rear of engine compartment, near strut tower), terminal B6 (Dark Green/White wire). Repair as necessary and recheck system operation. If contacts are okay, locate and repair problem in PCM system. See TESTS W/CODES article in ENGINE PERFORMANCE section.
  3. Check for open or short (to ground or voltage) in circuit No. 817 (Dark Green/White wire) between PCM connector C1 and instrument cluster Orange 32-pin connector C2, terminal E10. See Figure . Check for poor connection at instrument cluster vehicle speed input terminal. Repair as necessary and recheck system operation. If circuits and connections are okay, replace instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Recheck system operation.
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