Engine Coolant Temperature Gauge

Preliminary Setup
1. Disconnect the water temperature indicator sender unit connector. Connect one lead of the tester to the water temperature indicator sender unit connector pin 1, circuit 163 (R/W), and the other lead to ground.






Check C (Cold) Indication
2. Set the tester to 300 ohms. Key ON. Wait one minute. The engine coolant temperature gauge should indicate C (cold). Key OFF.






Check Sensor Operation
3. Set the tester to 18.3 ohms. Key ON. Wait one minute. The engine coolant temperature gauge should indicate H (hot). Key OFF.