CMTC Test 3A - Compass/Mini-Trip Computer Displaying "OC"

NOTE: Perform CMTC TEST 1A before proceeding with this test. For connector terminal identification wiring diagrams, refer to CONNECTOR IDENTIFICATION and refer to WIRING DIAGRAMS . Drive vehicle at least 3 miles (greater than 25 MPH) to update CMTC and perform, after each repair, TEST VER-1A - VERIFICATION PROCEDURE .

NOTE: For CMTC wiring diagram, see INSTRUMENT PANEL - ANALOG article.

CAUTION: Always turn ignition switch to OFF position prior to disconnecting any module connector.

Disconnect ambient temperature/battery temperature sensor connector. Sensor is located behind front bumper (right center). Connect jumper wire between connector terminals. Turn ignition on. Observe CMTC display. If CMTC displays SC, replace ambient temperature/battery temperature sensor. If CMTC does not display SC, go to next step.
Turn ignition off. Disconnect jumper wire. Disconnect Powertrain Control Module (PCM) Gray connector. Connect jumper wires between ground and each terminal of ambient temperature/battery temperature sensor harness connector. Using scan tool in ohmmeter mode, measure resistance at terminal No. 52 (Violet/Light Green wire) on PCM harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or greater, repair open sensor signal circuit between PCM and ambient temperature/battery temperature sensor.
With jumper wires still connected, measure resistance at terminal No. 43 (Black/Light Blue wire) on PCM connector. If resistance is less than 5 ohms, replace CMTC module. If resistance is 5 ohms or greater, repair open Black/Light Blue wire between PCM and ambient temperature/battery temperature sensor.