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• When Monitored: • Set Condition: Possible Causes CAN B BUS DTCs IN FRONT CONTROL MODULE (D55) CAN B BUS (+) CIRCUIT OPEN (D54) CAN B BUS (–) CIRCUIT OPEN ELECTRONIC OVERHEAD MODULE Diagnostic Test 1. CHECK FOR ACTIVE DTC U0019–CAN B BUS Turn the ignition on. With the scan tool, record and erase any Electronic Overhead Module DTCs. Turn the ignition off, wait 30 seconds then turn the ignition on. With the scan tool, read DTCs. Is DTC U0019–CAN B BUS active? Yes >> Go To 2 No >> The condition that caused this code to set is not present at this time. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1). 2. CHECK FOR ACTIVE CAN B BUS RELATED DTCS IN THE FRONT CONTROL MODULE With the scan tool, read Front Control Module DTCs Does the scan tool display any active CAN B BUS related DTCs? Yes >> Diagnose and repair the DTC(s). (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) No >> Go to 3 8M - 150 OVERHEAD CONSOLE - ELECTRICAL DIAGNOSTICS LX |