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Temperature Gauge Inaccurate

  1. Turn ignition switch to OFF position. Partially remove instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Turn ignition switch to RUN position. Check voltage at cluster connector C2, pin No. 5 (Purple wire). See Figure and Figure . If battery voltage is present, go to next step. If battery voltage is not present, repair circuit No. 14 (Purple wire) for open and retest.
  2. Measure resistance between cluster connector C2, pin No. 4 (Black/Yellow wire) and ground. If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open Black/Yellow wire. Check gauge operation.
  3. Disconnect engine coolant temperature sensor. Connect Instrument Gauge System Tester (014-R1063) to harness connector. Set tester to 173 ohms. Turn ignition switch to RUN position. If gauge reads cold, go to next step. If gauge does not read cold, go to step 5).
  4. Set gauge system tester to 30 ohms. If gauge does not read hot, go to next step. If gauge reads hot, replace engine coolant temperature sensor and retest.
  5. Turn ignition switch to RUN position. Check voltage between coolant temperature sensor connector and ground. If battery voltage is present, go to step 7). If battery voltage is not present, go to next step.
  6. Turn ignition off. Disconnect instrument cluster connector C1. Turn ignition on. Measure voltage between C1, pin No. 6 (on cluster) and ground. If battery voltage does not exist, go to next step. If battery voltage exists, repair open White/Red wire. Check gauge operation.
  7. Disconnect engine coolant temperature sensor. Disconnect instrument cluster connector C1. Measure resistance between cluster harness connector C1 (White/Red wire) and ground. If resistance is less than 10 k/ohms, repair shorted White/Red wire. If resistance is 10 k/ohms or greater, go to next step.
  8. Turn ignition switch to OFF position. Disconnect cluster connectors. Check for continuity across contact clips of temperature gauge. If there is continuity, go to next step. If no continuity, replace coolant temperature gauge.
  9. Connect cluster connectors. Check for continuity from gauge contact clips to cluster connector C1, pin No.6 (White/Red wire, gauge input), cluster connector C2, pin No. 4 (Black/Yellow wire, gauge ground) and cluster connector C2, pin No. 5 (Purple wire, ignition voltage). See Figure and Figure . Replace printed circuit if any circuits are faulty. See PRINTED CIRCUIT  under REMOVAL & INSTALLATION. If all circuits are okay, replace coolant temperature gauge and retest. See TEMPERATURE GAUGE  under REMOVAL & INSTALLATION
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