Temperature Gauge Does Not Work
- 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.
- If temperature gauge needle is at edge of Red section, there is a possibility a fault exists between sensor and fuel injection ECU, between fuel injection ECU and ignition system ECU, or between ignition system ECU and instrument cluster. See Fig 1 . Ensure testing is performed in correct sequence as a fault between sensor and fuel injection ECU may cause faults in all 3 ECUs.
- Start testing by checking whether fuel injection ECU exhibits Code 1-2-3 in diagnostic test mode No. 1 on diagnostic output A2. Diagnose Code 1-2-3 as necessary. Refer to the following list for the appropriate article.
- If fuel injection ECU does not exhibit Code 1-2-3, check whether ignition system ECU exhibits Code 1-2-3 in diagnostic test mode No. 1 on diagnostic output A6. Diagnose Code 1-2-3 as necessary. Refer to the following list for the appropriate article.
- If ignition ECU exhibits Code 1-2-3, there is no temperature signal going to ignition ECU or it is shorted to ground, voltage, or both. Refer to the following list for the appropriate article.
If ignition ECU does not exhibit Code 1-2-3, check for an open circuit in temperature signal Green/Gray wire between instrument cluster 30-pin connector terminal A26 and ignition ECU connector terminal B23.