2006 Mazda MPV ESFACTORY OEM SERVICE PROCEDURE

DTC U0073: Notes

DTC U0073 [AJ] DETECTION CONDITION AND POSSIBLE CAUSES

DTC U0073 CAN BUS OFF
DETECTION CONDITION 
  • CAN controller is damaged.
Diagnostic support note 
  • This is a continuous monitor (other).
  • The MIL illuminates if the PCM detects the above malfunction condition in the first drive cycle.
  • PENDING CODE is available if the PCM detects the above malfunction condition.
  • DTC is stored in the PCM memory.
POSSIBLE CAUSE 
  • Short to ground circuit between TCM terminal 2M and PCM terminal 92
  • Short to power circuit between TCM terminal 2J and PCM terminal 66
  • CAN communication line short each other
  • CAN controller damaged.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.