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Home >> Mazda >> 2013 >> 5 Grand Touring >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> On-Board Diagnostic [Engine Control System MZR 2.5] (5 Of 5) >> DTC U0073:00, U0101:00, U0121:00, U0155:00 >> Notes

DTC U0073:00, U0101:00, U0121:00, U0155:00: Notes

DTC U0073:00 CAN system communication error
DETECTION CONDITION 
  • If there is a 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.
  • The DTC is stored in PCM memory.
FAIL-SAFE FUNCTION  -
POSSIBLE CAUSE 
  • CAN bus communication line malfunction
  • PCM malfunction
SYSTEM WIRING DIAGRAM  -
DTC U0101:00 Communication error to TCM
DETECTION CONDITION 
  • When a communication error between the TCM continues for 5 s or more  .

    Diagnostic support note 

  • This is a continuous monitor (other).
  • The check engine light illuminates if PCM detects the above malfunction condition during the first drive cycle.
  • FREEZE FRAME DATA (Mode 2)/Snapshot data is available.
  • The DTC is stored in PCM memory.
FAIL-SAFE FUNCTION 
  • Controls the turbine rotation signal at 0  .
  • Inhibits the AT torque reduction request.
POSSIBLE CAUSE 
  • CAN communication line between PCM and TCM malfunction
  • PCM malfunction
SYSTEM WIRING DIAGRAM  -
DTC U0121:00 Communication error to DSC HU/CM
DETECTION CONDITION 
  • When a communication error between the DSC HU/CM continues for 5 s or more  .

    Diagnostic support note 

  • This is a continuous monitor (other).
  • The check engine light illuminates if PCM detects the above malfunction condition during the first drive cycle.
  • FREEZE FRAME DATA (Mode 2)/Snapshot data is available.
  • The DTC is stored in PCM memory.
FAIL-SAFE FUNCTION 
  • Inhibits the DSC control.
POSSIBLE CAUSE 
  • CAN communication line between PCM and DSC HU/CM malfunction
  • PCM malfunction
SYSTEM WIRING DIAGRAM  -
DTC U0155:00 Communication error to instrument cluster
DETECTION CONDITION 
  • When a communication error between the instrument cluster continues for 5 s or more  .

    Diagnostic support note 

  • This is a continuous monitor (other).
  • The check engine light illuminates if PCM detects the above malfunction condition during the first drive cycle.
  • FREEZE FRAME DATA (Mode 2)/Snapshot data is not available.
  • The DTC is stored in PCM memory.
FAIL-SAFE FUNCTION  -
POSSIBLE CAUSE 
  • CAN communication line between PCM and instrument cluster malfunction
  • PCM malfunction
SYSTEM WIRING DIAGRAM  -
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