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DTC P2507: Notes

DTC P2507[L3 WITH TC] DETECTION CONDITION AND POSSIBLE CAUSES

DTC P2507 PCM +BB (back-up battery) voltage low
DETECTION CONDITION 
  • The PCM monitors the voltage of the back-up battery positive terminal. If the PCM detects that the battery positive terminal voltage is below 2.5 V for2 s, the PCM determines that the backup voltage circuit has a malfunction  .

Diagnostic support note 
  • This is a continuous monitor (CCM).
  • MIL illuminates if the PCM detects the above malfunction condition during the first drive cycle.
  • FREEZE FRAME DATA is available.
  • DTCs are stored in the PCM memory.
POSSIBLE CAUSE 
  • Melt down EEC fuse
  • Open circuit in the wiring harness between the EEC fuse and PCM terminal 1 BA
  • Short to ground between the EEC fuse and PCM terminal 1 BA
  • Poor connection of the PCM connector.
  • PCM malfunction
G04859424Courtesy of MAZDA MOTORS CORP.
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