DTC U0001:88/U0100:00/U0101:00/U0121:00 [ELECTRONIC 4WD CONTROL SYSTEM]

id0302a6200800

DTC U0001:88		CAN system Communication error
DTC U0100:00		Communication error to PCM
DTC U0101:00		Communication error to TCM
DTC U0121:00		Communication error to DSC HU/CM
DETECTION CONDITION		•  U0001:88 ―  Open or short circuit in CAN system wiring harness is detected. •  U0100:00 ―  Communication error with PCM is detected in CAN communication. •  U0101:00 ―  Communication error with TCM is detected in CAN communication. •  U0121:00 ―  Communication error to DSC HU/CM is detected in CAN communication
FAIL-SAFE FUNCTION		•  U0001:88, U0100:00, U0121:00 ―  Control disabled. •  U0101:00 ―  Lost gear position signal: Control maintained by the specified data. ―  Except above: Control disabled.
POSSIBLE CAUSE		•  CAN system wiring harness open or short circuit •  CAN system wiring harness open or short circuit with PCM •  CAN system wiring harness open or short circuit with TCM •  CAN system wiring harness open or short circuit with DSC HU/CM
SYSTEM WIRING DIAGRAM		Not applicable

Diagnostic procedure