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Home >> Mazda >> 2021 >> CX-9 Signature >> Repair and Diagnosis >> Engine Performance >> System >> On-Board Diagnostic - Engine Control System (6 Of 6) >> DTC U0338-00: Start Stop Unit Error >> Notes
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DTC U0338-00: Start Stop Unit Error: Notes

DTC U0338:00 DETECTION CONDITION AND POSSIBLE CAUSE

DTC U0338:00 Start stop unit error
DETECTION CONDITION
  • When any of the following conditions is met:
    • CAN communication line malfunction between start stop unit and PCM
      • Start stop unit internal malfunction

    Diagnostic support note

  • This is a continuous monitor (other).
  • The check engine light does not illuminate.
  • FREEZE FRAME DATA is not available.
  • Snapshot data is available.
  • DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION
  • Not applicable
POSSIBLE CAUSE
  • CAN drive error (start stop unit or PCM)
  • CAN communication line malfunction between start stop unit and PCM
    • Start stop unit terminal 2M-Front body control module (FBCM) terminal 2K
    • Start stop unit terminal 2O-Front body control module (FBCM) terminal 2I
    • Front body control module (FBCM) terminal 2P-PCM terminal 2AK
      • Front body control module (FBCM) terminal 2N-PCM terminal 2AL
  • Start stop unit connector or terminals malfunction
  • PCM connector or terminals malfunction
  • Start stop unit malfunction
  • PCM malfunction
G13697950Courtesy of MAZDA MOTORS CORP.