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Symptom: *REPAIRING CMTC DISPLAYS DOUBLE DASH ( - - ) IN TEMP POSSIBLE CAUSES NO RESPONSE - PCI BUS - FRONT CONTROL MODULE CMTC BUS MESSAGE FAILURE COMPASS MINI-TRIP COMPUTER AMBIENT TEMPERATURE SENSOR AMBIENT TEMPERATURE SENSOR SIGNAL CIRCUIT SHORT TO SENSOR CIRCUIT AMBIENT TEMPERATURE SENSOR SIGNAL CIRCUIT SHORT TO GROUND AMBIENT TEMPERATURE SENSOR SIGNAL CIRCUIT OPEN AMBIENT TEMPERATURE SENSOR RETURN CIRCUIT OPEN INTELLIGENT POWER MODULE FRONT CONTROL MODULE TEST ACTION APPLICABILITY 1 Turn the ignition on. t, select System Monitors, J1850 Module Scan. Does the DRBIII t display FCM on the BUS? All Yes → Go To 2 No → Refer to the COMMUNICATIONS category and perform the appropriate symptom. 2 Turn the ignition on. t, select Body, Compass Mini-Trip, System Tests, then Auto Self Test. t display TEST FAILED: Bus Message Failure? All Yes → Refer to the COMMUNICATIONS category and perform the appropriate symptom. No → Go To 3 3 Turn the ignition on. t, select Body, Compass Mini-Trip, System Tests, then Auto Self Test. t display TEST FAILED: Internal EVIC Failure? All Yes → Replace the Compass Mini-Trip Computer in accordance with the Service Information. No → Go To 4 751 OVERHEAD CONSOLE |