Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
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• The PCM monitors the voltage of the backup battery positive at PCM
terminal 1AX. If the PCM detects that the battery positive terminal voltage
is 2.5 V or less for 2 s, the PCM determines that the backup voltage circuit
has a malfunction.
Diagnostic support note
• This is a continuous monitor (CCM).
• The MIL illuminates if PCM detects the above malfunction condition during
the first drive cycle.
• The PENDING CODE is available if the PCM detects the above malfunction
condition.
• The FREEZE FRAME DATA is available.
• The DTC is stored in the PCM memory.
• Connector or terminal malfunction
• Open circuit in wiring harness between the battery positive terminal and
PCM terminal 1AX
• Short to GND in wiring harness between the battery positive terminal and
PCM terminal 1AX
• PCM malfunction
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