CMTC Self-Check

Turn ignition off. Depress and hold STEP and US/M buttons on CMTC. Turn ignition on while continuing to hold STEP and US/M buttons. Release buttons when segment test starts. When self-check test is complete, CMTC should return to normal operation. If CMTC displays FAIL after self-check test is complete, replace and program CMTC. See COMPASS/MINI-TRIP COMPUTER  under REMOVAL & INSTALLATION. If CMTC displays BUS after self-check test is complete, perform appropriate test under COMMUNICATIONS. See DIAGNOSTIC TROUBLE CODE IDENTIFICATION  table under SELF-DIAGNOSTIC SYSTEM.