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Test 46A - Repairing Temperature Gauge

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION. For wiring diagrams, see WIRING DIAGRAMS article in the ENGINE PERFORMANCE Section. Perform TEST VER - 1A after each repair.
CAUTION: Always turn ignition switch to OFF position prior to disconnecting or connecting any module connector.
NOTE: Ensure engine cooling system is operating properly.
  1. If cooling system not operating properly, repair cooling system as necessary. If cooling system is operating properly, read engine temperature sensor voltage using DRB-II. If voltage is less than 10 volts, go to step 5).
  2. If voltage is more than 10 volts, disconnect engine temperature sending unit. Check connector, and clean or repair connector as necessary. Connect a jumper wire between temperature gauge sense circuit (Violet/Yellow wire) at temperature sending unit connector and ground.
  3. If DRB-II displays less than one volt, replace engine temperature sending unit. If DRB-II displays more than one volt, disconnect jumper wire. Gain access to body controller. Body controller is located under left side of instrument panel. Connect a jumper wire between temperature gauge sense circuit at Natural body controller connector terminal No. 23 (Violet/Yellow wire) and ground.
  4. If DRB-II displays less than one volt, repair open in Violet/Yellow wire between engine and body controller. If DRB-II displays more than one volt, replace body controller.
  5. Disconnect engine temperature sending unit. If DRB-II displays more than 10 volts, replace engine temperature sending unit. If DRB-II displays less than 10 volts, turn ignition switch to OFF position.
  6. Disconnect Blue body controller connector. Body controller is located under left side of instrument panel. Check connector, and clean or repair connector as necessary. Turn ignition switch to ON position.
  7. Using DRB-II in voltmeter mode, check voltage of fused ignition feed circuit at Blue body controller connector terminal No. 22 (Dark Blue). If DRB-II displays less than 10 volts, repair open in Dark Blue wire. If DRB-II displays more than 10 volts, turn ignition switch to OFF position.
  8. Using DRB-II in ohmmeter mode, check resistance of temperature gauge sense circuit at Natural body connector, terminal No. 23 (Violet/Yellow wire). If resistance is more than 5 ohms, replace body controller. If resistance is less than 5 ohms, repair short to ground in Violet/Yellow wire between engine and body controller.
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