Temperature Gauge Reading Incorrect

1. Turn ignition on. Activate diagnostic test mode No. 3. See ON-BOARD DIAGNOSTICS (1995 MODELS) under SYSTEM TESTING. 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. 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, diagnose fuel injection ECU. Refer to the following list for the appropriate article.
   • See TESTS W/CODES - NON-TURBO (A/T) - MOTRONIC 4.4
   • See TESTS W/CODES - NON-TURBO (M/T) - MOTRONIC 4.4
   • See TESTS W/CODES - NON-TURBO - MOTRONIC 4.3
   • See TESTS W/CODES - TURBO - MOTRONIC 4.3

If signal voltage and ground are okay, replace instrument cluster.