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Test 16A - Diagnosing External Temperature Sensor

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.
  1. Turn ignition switch to ON position. If compass/mini-trip screen displays "OC", go to step 5). If compass/mini-trip screen does not display "OC", turn ignition switch to OFF position. Disconnect external temperature sensor. See Fig 1 . Check connector, and clean or repair connector as necessary. Turn ignition switch to ON position. If compass/mini-trip screen displays "OC", replace external temperature sensor.
    Fig 1: Locating External Temperature Sensor
    G92D22734
  2. If compass/mini-trip screen does not display "OC", turn ignition switch to OFF position. Disconnect compass/mini-trip module connector. Check connector, and clean or repair connector as necessary. Using DRB-II in ohmmeter mode, measure resistance of temperature sensor signal circuit at compass/mini-trip module connector terminal No. 5 (Violet/Light Green wire).
  3. If resistance is less than 5 ohms, repair short to ground in Violet/Light Green wire. If resistance is more than 5 ohms, use external ohmmeter to measure resistance between terminals No. 5 (Violet/Light Green wire) and No. 4 (Black/Light Blue wire).
  4. If resistance is less than 5 ohms, repair Violet/Light Green for a short to Black/Light Blue wire. If resistance is more than 5 ohms, replace compass/mini-trip module.
  5. If compass/mini-trip screen displays "OC" in step 1), turn ignition switch to OFF position. Disconnect external temperature sensor. Check connector, and clean or repair connector as necessary. Connect a jumper wire between external temperature sensor connector terminals. Turn ignition switch to ON position.
  6. If compass/mini-trip screen displays "SC", replace external temperature sensor. If compass/mini-trip screen does not display "SC", turn ignition switch to OFF position. Disconnect jumper wire. Disconnect compass/mini-trip module. Check connector, and clean or repair connector as necessary.
  7. Connect a jumper wire between Violet/Light Green and Black/Light Blue wires of external temperature sensor connector and ground. Using DRB-II in ohmmeter mode, measure resistance of temperature sensor signal circuit at compass/mini-trip module connector terminal No. 5 (Violet/Light Green wire). If resistance is more than 5 ohms, repair open Violet/Light Green wire.
  8. If resistance is less than 5 ohms, with jumper wire still connected, measure resistance of temperature sensor return circuit compass/mini-trip module connector terminal No. 4 (Black/Light Blue wire). If resistance is more than 5 ohms, repair open Black/Light Blue wire. If resistance is less than 5 ohms, replace compass/mini-trip module.
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