| DETECTION CONDITION |
- The PCM monitors the voltage of backup battery positive terminal. If the PCM detects that the battery positive terminal voltage is below 2.5 V
for 2 s
, the PCM determines that the backup voltage circuit has a malfunction.
Diagnostic support note
- This is a continuous monitor (CCM).
- The check engine light illuminates if the 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 the PCM memory.
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| FAIL-SAFE FUNCTION |
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| POSSIBLE CAUSE |
- Battery malfunction
- PCM connector or terminals malfunction
- Short to ground or open circuit in backup voltage circuit
- Short to ground in wiring harness between ENG+B 10 A fuse and PCM terminal 1C
- ENG+B 10 A fuse malfunction
- Open circuit in wiring harness between battery positive terminal and PCM terminal 1C
- PCM malfunction
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 Courtesy of MAZDA MOTORS CORP.
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