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Test 104A - EIC Repairing Temperature Gauge Problems

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION  . For appropriate wiring diagram, see WIRING DIAGRAMS  section at the end of this article. Perform TEST VER-1B after each repair.
CAUTION: Always turn ignition off prior to disconnecting or connecting any module connector.
  1. Ensure cooling system is operating properly. If cooling system is not operating properly, repair cooling system as needed. If cooling system is operating properly, go to next step.
  2. Using scan tool, read engine temperature sensor voltage. If voltage is more than 10 volts, go to step 6). If voltage is less than 10 volts, go to next step.
  3. Disconnect Engine Coolant Temperature (ECT) sensor connector. Check, clean and repair connections as needed. Using scan tool, read ECT sensor voltage. If voltage is more than 10 volts, replace ECT sensor. If voltage is less than 10 volts, go to next step.
  4. Turn ignition off. Gain access to Body Control Module (BCM), located behind left side knee panel. Disconnect BCM connectors. Turn ignition on. Using scan tool in voltmeter mode, check voltage on BCM Blue connector terminal No. 6 (Dark Blue/White wire). If voltage is less than 10 volts, repair open Dark Blue/White wire between BCM and splice. If voltage is more than 10 volts, go to next step.
  5. Turn ignition off. Using scan tool in ohmmeter mode, check resistance of BCM Natural connector terminal No. 24 (Violet/Yellow wire). If resistance is more than 5 ohms, replace BCM. If resistance is less than 5 ohms, repair short to ground in Violet/Yellow wire.
  6. Disconnect ECT sensor connector. Connect a jumper wire between ECT sensor connector (Violet/Yellow wire) and chassis ground. Using scan tool in voltmeter mode, read ECT sensor voltage. If voltage is less than one volt, replace ECT sensor. If voltage is more than one volt, go to next step.
  7. Disconnect jumper wire. Gain access to Body Control Module (BCM), located behind left side knee panel. Connect jumper wire between BCM Natural connector terminal No. 24 (Violet/Yellow wire) and chassis ground. Using scan tool, read ECT sensor voltage. If voltage is less than one volt, repair open Violet/Yellow wire. If voltage is more than one volt, go to next step.
  8. Disconnect jumper wire. Disconnect BCM Blue connector. Check, clean and repair connections as needed. If connections are okay, replace BCM.
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