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DTC U0121:00 [PCM (SKYACTIV-X)]

id0102u9327700

Outline

System malfunction location

CAN communication: communication error to electronically controlled brake unit

Detection condition

•  Communication error between the PCM and electronically controlled brake unit continues for 5 s or more.

Fail-safe

•  Inhibits the DSC control.

•  Inhibits engine-stop by operating the i-stop function.

Possible cause

•  CAN communication line malfunction between PCM and electronically controlled brake unit

•  Electronically controlled brake unit malfunction

•  PCM malfunction

System wiring diagram

•  Not applicable

Connector diagram

•  Not applicable

System malfunction location	CAN communication: communication error to electronically controlled brake unit
Detection condition	• Communication error between the PCM and electronically controlled brake unit continues for 5 s or more.
Fail-safe	• Inhibits the DSC control. • Inhibits engine-stop by operating the i-stop function.
Possible cause	• CAN communication line malfunction between PCM and electronically controlled brake unit • Electronically controlled brake unit malfunction • PCM malfunction
System wiring diagram	• Not applicable
Connector diagram	• Not applicable

Diagnostic Procedure

• Inspect according to the diagnostic procedure in ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].)