CMTC Test 1A - Identifying Compass/Mini-Trip Problems

NOTE: Perform SYMPTOM ID TEST 1A before proceeding with this test. For connector terminal identification and wiring diagrams, see appropriate sections in this article. Perform VERIFICATION TEST VER-1A after each repair.

Using scan tool, select COMPASS/MINI-TRIP. If scan tool displays NO RESPONSE, or Compass/Mini-Trip Computer (CMTC) shows NO DISPLAY (except for direction or temperature), go to TEST 5A in appropriate SYMPTOM ID TEST 1A - IDENTIFYING VEHICLE EQUIPMENT & SYSTEM PROBLEMS
NOTE: For connector terminal identification and wiring diagrams, go to appropriate section in this article. When directed to go to next step, disregard step if vehicle is not equipped with module being tested.

NOTE: Perform a visual inspection before proceeding with this test.
Connect scan tool to Data Link Connector (DLC). DLC is a 16-pin connector located on left side of steering column. Turn ignition switch to ON position. If scan tool display is not blank, go to next step. If scan tool display is blank, see appropriate VEHICLE COMMUNICATIONS article.
Select AUTO SELF TEST. If any display segments fail to illuminate, replace CMTC module. If CMTC displays FAILED, replace CMTC module.

Diagnosis of CMTC system is separated into 10 faults. Identify fault(s) listed in CMTC SYSTEM DIAGNOSTIC TEST DIRECTORY table and perform indicated test(s).

CMTC SYSTEM DIAGNOSTIC TEST DIRECTORY

Problem

Perform

Outside Temperature

CMTC Displays SC

CMTC TEST 2A

CMTC Displays OC

CMTC TEST 3A

Incorrect Reading (5 Degree Variation)

CMTC TEST 4A

Average MPG Or Fuel Economy ⁽¹⁾

CMTC TEST 5A

Trip Odometer Inoperative Or Wrong

CMTC TEST 5A

Distance To Empty Inoperative Or Wrong

INSTRUMENT CLUSTER TEST 3A

Elapsed Time Inoperative Or Wrong

CMTC TEST 6A

⁽¹⁾	Average MPG or fuel economy is inoperative or wrong. MPG calculations are only accurate to within 10 miles.

If CMTC fails to respond to instrument cluster dimming, replace CMTC module. If CMTC switch is inoperative, replace CMTC module. If compass is inoperative or wrong, locate open area away from large metal objects. Turn ignition on. Press and hold compass/temperature button until CAL is displayed. Driving slowly, perform 3 complete circles. CAL lamp will turn off and compass will be calibrated. If compass goes blank, replace CMTC module.