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850 (Temperature Gauge Reading Incorrect)

  1. Turn ignition on. Activate diagnostic test mode No. 3. See DIAGNOSTIC TEST MODE NO. 3 under SELF-DIAGNOSTICS. Check if temperature gauge needle is at edge of Red section. If temperature gauge does not operate as specified, replace instrument cluster.
  2. If temperature gauge needle is at edge of Red section, check ground circuit between instrument cluster 30-pin connector terminal A15 (Brown wire) and ground and repair as necessary. In addition, check temperature signal from fuel injection ECU terminal B23. See Figure. With ignition on, digital signal of 5-6 volts to 15 volts should be present. If signal voltage is incorrect, see appropriate TESTS W/CODES article in ENGINE PERFORMANCE and diagnose fuel injection ECU. If signal voltage and ground are okay, replace instrument cluster.
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