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Coolant Temperature Gauge Test

WARNING: This page is about a different car, the 1997 Pontiac Bonneville. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition off. Disconnect Engine Coolant Temperature (ECT) sensor connector. Connect a Red lead of Gauge Tester (J 33431) to ECT sensor harness connector terminal "C" (Light Green wire) and other Red lead ground. Turn ignition on.
  2. Set gauge tester resistance dials to 1400, 93, then 55 ohms. Coolant temperature gauge should indicate cold, midrange then hot. If gauge responds as specified, check connections for good terminal contact. If terminal contact is okay, replace coolant temperature sensor.
  3. If gauge does not respond as specified, turn ignition off. Disconnect tester. Check all related wiring for good terminal contact and open circuits. If all wiring is okay, replace IPC.
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