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2014 - Mazda6 - Engine

DTC U0073:00, U0101:00, U0104:00, U0121:00, U0131:00, U0140:00, U0151:00, U0155:00, U0214:00, U0235:00 [SKYACTIV-G 2.5]



DTC U0073:00

CAN system communication error (HS CAN)

DETECTION CONDITION

  • Malfunction in CAN bus communication line.

    Diagnostic support note

  • This is a continuous monitor (other).

  • The check engine light does not illuminate.

  • FREEZE FRAME DATA (Mode 2)/Snapshot data is not available.

  • DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

Not applicable

POSSIBLE CAUSE

  • CAN bus communication line malfunction

  • PCM malfunction

SYSTEM WIRING DIAGRAM

Not applicable



DTC U0101:00

CAN communication: communication error to TCM

DETECTION CONDITION

  • Communication error between the PCM and TCM continues for 5 s or more.

    Diagnostic support note

  • This is a continuous monitor (other).

  • The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle.

  • FREEZE FRAME DATA (Mode 2)/Snapshot data is available.

  • DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

  • Controls the turbine rotation signal at 0.

  • Inhibits the AT torque reduction request.

POSSIBLE CAUSE

NOTE:

  • During malfunction diagnosis, first verify the malfunction detection of DTC U0074:00 or U0115:00 for the TCM.

  • CAN communication line malfunction between PCM and TCM

  • TCM malfunction

  • PCM malfunction

SYSTEM WIRING DIAGRAM

Not applicable



DTC U0104:00

CAN communication: communication error to vehicle control module (V/C-module)

DETECTION CONDITION

  • Communication error between the PCM and vehicle control module (V/C-module) continues for 5 s or more.

    Diagnostic support note

  • This is a continuous monitor (other).

  • The check engine light does not illuminate.

  • FREEZE FRAME DATA (Mode 2)/Snapshot data is not available.

  • DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

  • The vehicle control module (V/C-module) function is cancelled.

POSSIBLE CAUSE

  • CAN communication line malfunction between PCM and vehicle control module (V/C-module)

  • Vehicle control module (V/C-module) malfunction

  • PCM malfunction

SYSTEM WIRING DIAGRAM

Not applicable



DTC U0121:00

CAN communication: communication error to DSC HU/CM

DETECTION CONDITION

  • Communication error between the PCM and DSC HU/CM continues for 5 s or more.

    Diagnostic support note

  • This is a continuous monitor (other).

  • The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle.

  • FREEZE FRAME DATA (Mode 2)/Snapshot data is available.

  • DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

  • Inhibits the DSC control.

POSSIBLE CAUSE

  • CAN communication line malfunction between PCM and DSC HU/CM

  • DSC HU/CM malfunction

  • PCM malfunction

SYSTEM WIRING DIAGRAM

Not applicable



DTC U0131:00

CAN communication: communication error to EPS control module

DETECTION CONDITION

  • Communication error between the PCM and EPS control module continues for 5 s or more.

    Diagnostic support note

  • This is a continuous monitor (other).

  • The check engine light does not illuminate.

  • FREEZE FRAME DATA (Mode 2)/Snapshot data is not available.

  • DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

Not applicable

POSSIBLE CAUSE

  • CAN communication line malfunction between PCM and EPS control module

  • EPS control module malfunction

  • PCM malfunction

SYSTEM WIRING DIAGRAM

Not applicable



DTC U0140:00

CAN communication: communication error to front body control module (FBCM)

DETECTION CONDITION

  • Communication error between the PCM and front body control module (FBCM) continues for 5 s or more.

    Diagnostic support note

  • This is a continuous monitor (other).

  • The check engine light does not illuminate.

  • FREEZE FRAME DATA (Mode 2)/Snapshot data is not available.

  • DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

Not applicable

POSSIBLE CAUSE

  • CAN communication line malfunction between PCM and front body control module (FBCM)

  • Front body control module (FBCM) malfunction

  • PCM malfunction

SYSTEM WIRING DIAGRAM

Not applicable



DTC U0151:00

CAN communication: communication error to SAS control module

DETECTION CONDITION

  • Communication error between the PCM and SAS control module continues for 5 s or more.

    Diagnostic support note

  • This is a continuous monitor (other).

  • The check engine light does not illuminate.

  • FREEZE FRAME DATA (Mode 2)/Snapshot data is not available.

  • DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

Not applicable

POSSIBLE CAUSE

  • CAN communication line malfunction between PCM and SAS control module

  • SAS control module malfunction

  • PCM malfunction

SYSTEM WIRING DIAGRAM

Not applicable



DTC U0155:00

CAN communication: communication error to instrument cluster

DETECTION CONDITION

  • Communication error between the PCM and instrument cluster continues for 5 s or more.

    Diagnostic support note

  • This is a continuous monitor (other).

  • The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle.

  • FREEZE FRAME DATA (Mode 2)/Snapshot data is available.

  • DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

Not applicable

POSSIBLE CAUSE

  • CAN communication line malfunction between PCM and instrument cluster

  • Instrument cluster malfunction

  • PCM malfunction

SYSTEM WIRING DIAGRAM

Not applicable



DTC U0214:00

CAN communication: communication error to start stop unit

DETECTION CONDITION

  • Communication error between the PCM and start stop unit continues for 5 s or more.

    Diagnostic support note

  • This is a continuous monitor (other).

  • The check engine light does not illuminate.

  • FREEZE FRAME DATA (Mode 2)/Snapshot data is not available.

  • DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

Not applicable

POSSIBLE CAUSE

  • CAN communication line malfunction between PCM and start stop unit

  • Start stop unit malfunction

  • PCM malfunction

SYSTEM WIRING DIAGRAM

Not applicable



DTC U0235:00

CAN communication: communication error to laser sensor

DETECTION CONDITION

  • Communication error between the PCM and laser sensor continues for 5 s or more.

    Diagnostic support note

  • This is a continuous monitor (other).

  • The check engine light does not illuminate.

  • FREEZE FRAME DATA (Mode 2)/Snapshot data is not available.

  • DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

  • The smart city brake support function is cancelled.

POSSIBLE CAUSE

  • CAN communication line malfunction between PCM and laser sensor

  • Laser sensor malfunction

  • PCM malfunction

SYSTEM WIRING DIAGRAM

Not applicable

Diagnostic Procedure



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