DTC U0156-00: Can Communication System: Communication Error To Connectivity Master Unit (CMU) (PYUL)

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U0156: 00 (PCM (PYUL)) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	CAN communication system: Communication error to connectivity master unit (CMU)
Detection condition	Communication error between the PCM and connectivity master unit (CMU) continues for a specified period of time.
Fail-safe	Inhibits engine-stop by i-stop control.
Possible cause	Malfunction in CAN communication line between connectivity master unit (CMU) and PCM NOTE: Perform the malfunction diagnosis according to the troubleshooting procedure for the multiplex communication system. (See MALFUNCTION DIAGNOSIS FLOW [CONTROLLER AREA NETWORK (CAN)] .) Connectivity master unit (CMU) malfunction (Refer to [CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION ] ). PCM malfunction (Refer to [PCM REMOVAL/INSTALLATION ] ).
Repeatability verification procedure	Clear the DTC recorded in the memory. (See CLEARING DTC .) Perform the KOEO or KOER self test. (See DTC INSPECTION .)
System Wiring Diagram	Not applicable