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U0121 CAN COMMUNICATION ECK-161 < DTC/CIRCUIT DIAGNOSIS > [K9K] C D E F G H I J K L M A ECK N P O U0121 CAN COMMUNICATION DTC Logic INFOID:0000000010434240 DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1. PERFORM DTC CONFIRMATION PROCEDURE 1. Turn ignition switch ON and wait at least 3 seconds. 2. Check DTC. Is DTC detected? YES >> Proceed to ECK-161, "Diagnosis Procedure" NO >> INSPECTION END Diagnosis Procedure INFOID:0000000010434241 1. CHECK DTC WITH ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) Check DTC with ABS actuator and electric unit (control unit). Refer to . Is DTC detected? YES >> Check intermittent incident. Refer to GI-41, "Intermittent Incident" . NO >> Perform trouble shooting relevant to DTC indicated. DTC No. CONSULT screen terms (Trouble diagnosis content) DTC detecting condition Possible cause U0121 MLTIPLXD TRACTION CNTRL CONN ER MULTIPLEX SIGNALS • 2.DEF: INVALID SOURCE COMPUT- ER MULTIPLEX SIGNALS • 3.DEF: CIRCUIT QUANTITY NOT PLAUSIBLE When ECM is not receiving CAN commu- ABS actuator and electric unit |