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Test 17A - Temperature Gauge Problem

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION  . For appropriate wiring diagram, see WIRING DIAGRAMS  at end of article.
  1. Check cooling system operation. If cooling system is not operating properly, repair cooling system as necessary. If cooling system is operating properly, turn ignition on (engine off).
  2. Using DRB-II in voltmeter mode, read engine temperature sensor voltage. If DRB-II displays less than one volt, go to step 7). If DRB-II displays more than one volt, disconnect engine temperature sensor connector. Temperature sensor is located near front of valve cover.
  3. Check connector condition, and clean or repair connector as necessary. Connect jumper wire between Violet/Yellow wire of engine temperature sensor connector and ground. If DRB-II displays less than one volt, replace engine temperature sensor. Perform VERIFICATION PROCEDURE VER-1.
  4. If DRB-II displays more than one volt, turn ignition off. Access Body Control Module (BCM) Red connector. BCM is located behind right side kick panel.
  5. Connect jumper wire between terminal No. 24 (Violet/Yellow wire) of Body Control Module (BCM) Red connector and ground. DO NOT  disconnect BCM connector. If DRB-II displays less than one volt, repair open Violet/Yellow wire. Perform VERIFICATION PROCEDURE VER-1.
  6. If DRB-II displays more than one volt, turn ignition off. Disconnect BCM Red connector. Check connector condition, and clean or repair connector as necessary. Perform VERIFICATION PROCEDURE VER-1. If connector condition is okay, replace BCM. Perform VERIFICATION PROCEDURE VER-1.
  7. Disconnect engine temperature sensor connector. Temperature sensor is located near front of valve cover. Check connector condition, and clean or repair connector as necessary. If DRB-II displays more than 10 volts, replace engine temperature sensor. Perform VERIFICATION PROCEDURE VER-1.
  8. If DRB-II displays less than 10 volts, turn ignition off. Disconnect both BCM connectors. BCM is located behind right side kick panel. Check condition of connectors, and clean or repair connectors as necessary.
  9. Turn ignition on (engine off). Using DRB-II in voltmeter mode, check voltage on terminal No. 6 (Dark Blue/White wire) of BCM Red connector. If voltage is less than 10 volts, repair open Dark Blue/White wire. Perform VERIFICATION PROCEDURE VER-1. If voltage is more than 10 volts, turn ignition off.
  10. Using DRB-II in ohmmeter mode, check resistance on terminal No. 24 (Violet/Yellow wire) of BCM Red connector. If resistance is less than 10 ohms, repair short to ground in Violet/Yellow wire. Perform VERIFICATION PROCEDURE VER-1. If resistance is more than 10 ohms, replace BCM. Perform VERIFICATION PROCEDURE VER-1.
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