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DTC P2503:00: Notes

DTC P2503:00 (L3 WITH TC) DETECTION CONDITION & POSSIBLE CAUSES

DTC P2503:00 Charging system voltage low
DETECTION CONDITION 
  • The PCM needs more than 20 A  from the generator, and determines that the generator output voltage below 8.5 V  for 5 s  while the engine is running.

Diagnostic support note 
  • This is a continuous monitor (other).
  • The MIL does not illuminate.
  • FREEZE FRAME DATA (Mode 2)/Snapshot data is not available.
  • The DTC is stored in the PCM memory.
POSSIBLE CAUSE 
  • Drive belt exceed limit
  • Generator connector or terminals malfunction
  • Short to ground in wiring harness between the following terminals:
    • Generator terminal D-PCM terminal 1AW
    • Generator terminal P-PCM terminal 1AX
  • PCM connector or terminals malfunction
  • Open circuit in wiring harness between the following terminals:
    • Generator terminal D-PCM terminal 1AW
    • Generator terminal P-PCM terminal 1AX
  • Generator malfunction
  • PCM malfunction
G06731691Courtesy of MAZDA MOTORS CORP.
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