Mazda 3 Workshop Manual page 377

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
DETECTION
CONDITION
POSSIBLE CAUSE
Diagnostic procedure
STEP
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• The PCM monitors changes in input voltage from the brake switch. If the
PCM does not detect PCM terminal 1AU voltage changes while alternately
accelerating and decelerating 8 times, the PCM determines that brake
switch circuit has malfunction.
Diagnostic support note
• This is a continuous monitor (CCM).
• The MIL illuminates if the PCM detects the above malfunction condition in
two consecutive drive cycles or in one drive cycle while the DTC for the
same malfunction has been stored in the PCM.
• PENDING CODE is available if the PCM detects the above malfunction
condition during first drive cycle.
• FREEZE FRAME DATA is available.
• The DTC is stored in the PCM memory.
• Brake switch malfunction
• Poor connection of brake switch connector or PCM connector
• Short to power supply in wiring harness between brake switch terminal D
and PCM connector terminal 1AU
• Open circuit in wiring harness between brake switch terminal D and PCM
connector terminal 1AU
• Open circuit in wiring harness between battery positive terminal and brake
switch terminal A
• PCM malfunction
INSPECTION
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ACTION
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