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• When Monitored: • Set Condition: Possible Causes (D55) CAN B BUS (+) CIRCUIT SHORTED TO GROUND (D54) CAN B BUS (-) CIRCUIT SHORTED TO GROUND (D55) CAN B BUS (+) CIRCUIT SHORTED TO VOLTAGE (D54) CAN B BUS (-) CIRCUIT SHORTED TO VOLTAGE (D55) CAN B BUS (+) CIRCUIT SHORTED TO (D54) CAN B BUS (-) CIRCUIT (D55) CAN B BUS (+) CIRCUIT OPEN (D54) CAN B BUS (-) CIRCUIT OPEN ANY CAN B BUS MODULE Diagnostic Test 1. TEST FOR INTERMITTENT CONDITION Turn the ignition on. With the scan tool, record and erase FCM DTC’s. Cycle the ignition from on to off 3 times. Turn the ignition on. With the scan tool, read active FCM DTC’s. Does the scan tool display this DTC as active? Yes >> Go To 2 No >> The conditions that caused this code to set are not present at this time. Using the wiring diagram/sche- matic as a guide, inspect the wiring and connectors. 2. ANY CAN B BUS MODULE— INTERNAL FAULT Turn the ignition off. With the scan tool, monitor the active FCM DTCs. While monitoring the scan tool, disconnect each CAN B Bus module one at a time. NOTE: When performing the above step, turn the ignition off (wait one minute) before disconnecting any NOTE: This is to determine if the fault is internal within a module. NOTE: If the DTC becomes stored when a particular CAN B Bus module is disconnected, that module is With all the CAN B Bus modules disconnected did the FCM still set this DTC as active? Yes >> Go To 3 No >> Replace the module that when disconnected the DTC became stored. Perform BODY VERIFICATION TEST – VER 1. (Refer to BODY VERIFICATION TEST – VER 1). 8E - 118 ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS LX |