Engine Coolant Temperature Gauge

1. Disconnect water temperature indicator sender unit. Connect one lead of the tester to water temperature indicator sender unit, circuit 39 (R/W), and the other lead to ground.






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






3. Set the tester to 45 ohms. Key ON. Wait one minute. The engine coolant temperature gauge pointer should be in the one quarter range to mid range. Key OFF.






4. Set the tester to 18 ohms. Key ON. Wait one minute. The engine coolant temperature gauge should indicate H (hot). Key OFF. Return to the Pinpoint Test.