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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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DTC U0073:00, U0100:00, U0121:00, U0131:00, U0155:00, U0214:00 [TCM (SJ6A-EL)]

DTC U0073:00	CAN communication: Module communication error
DETECTION CONDITION	Vehicle condition: TCM communication normal Status: Detects CAN BUS OFF malfunction Period: After CAN controller reset, confirmed by re-detection
FAIL-SAFE FUNCTION	Inhibits the manual shift control.
POSSIBLE CAUSE	CAN bus communication line malfunction TCM malfunction
SYSTEM WIRING DIAGRAM	Not applicable

DTC U0100:00	CAN communication: Communication error between PCM
DETECTION CONDITION	Vehicle condition: TCM communication normal Status: Detects communication error with PCM Period: Detects communication time-out
FAIL-SAFE FUNCTION	Not applicable
POSSIBLE CAUSE	CAN communication line malfunction between PCM and TCM
SYSTEM WIRING DIAGRAM	Not applicable

DTC U0121:00	CAN communication: Communication error between DSC HU/CM
DETECTION CONDITION	Vehicle condition: TCM communication normal Status: Detects communication error with DSC HU/CM Period: Confirmed 1 time in 0.5 s or more, or 2 s or more
FAIL-SAFE FUNCTION	Inhibits learning control. Inhibits direct mode. Inhibits AAS mode. Inhibits slip control.
POSSIBLE CAUSE	CAN communication line malfunction between TCM and DSC HU/CM
SYSTEM WIRING DIAGRAM	Not applicable

DTC U0131:00	CAN communication: Communication error between EPS control module
DETECTION CONDITION	Vehicle condition: TCM communication normal Status: Detects communication error with EPS control module Period: Confirmed 1 time in 0.5 s or more
FAIL-SAFE FUNCTION	Not applicable
POSSIBLE CAUSE	CAN communication line malfunction between TCM and EPS control module
SYSTEM WIRING DIAGRAM	Not applicable

DTC U0155:00	CAN communication: Communication error between instrument cluster
DETECTION CONDITION	Vehicle condition: TCM communication normal Status: Detects communication error with instrument cluster Period: Confirmed 1 time in 2 s or more
FAIL-SAFE FUNCTION	Inhibits the manual shift control. Inhibits manual shifting using the up or down switch of the selector lever.
POSSIBLE CAUSE	CAN communication line malfunction between TCM and instrument cluster
SYSTEM WIRING DIAGRAM	Not applicable

DTC U0214:00	CAN communication: Communication error between start stop unit
DETECTION CONDITION	Vehicle condition: TCM communication normal Status: Detects communication error with start stop unit Period: Confirmed 1 time in 2 s or more
FAIL-SAFE FUNCTION	Inhibits direct mode.
POSSIBLE CAUSE	CAN communication line malfunction between TCM and start stop unit
SYSTEM WIRING DIAGRAM	Not applicable

Diagnostic Procedure

Inspect according to the diagnostic procedure in ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]. (See FOREWORD.)

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