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DTC P0703:00: Notes

DTC P0703:00 (MZR 1.5) DETECTION CONDITION AND POSSIBLE CAUSES

DTC P0703:00 Brake switch input circuit problem
DETECTION CONDITION 
  • The PCM monitors changes in input voltage from the brake switch No. 1. If the PCM does not detect a voltage change while following decelerating 8 times, the PCM determines that the brake switch No. 1 circuit has a malfunction.

    MONITORING CONDITIONS 

    • Vehicle speed: from above 30 km/h {19 mph}  to 0 km/h {0 mph} 
    • Deceleration rate: exceed 2.4 km/h {1.5 mph} per 1 s 

    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 (Mode 2)/Snapshot data is available.
  • The DTC is stored in the PCM memory.
POSSIBLE CAUSE 
CAUTION:
  • Inspect the brake switch with it installed to the brake pedal, otherwise the brake switch may not operate normally. If the brake switch is removed from the brake pedal, replace the brake switch with a new one.
  • Brake switch connector or terminals malfunction
  • Short to ground or open circuit in brake switch No. 1 power supply circuit
    • ATX:
      • Short to ground in wiring harness between MAIN 200 A fuse and brake switch terminal B
      • MAIN 200 A fuse and/or STOP 10 A fuse malfunction
      • Open circuit in wiring harness between battery positive terminal and brake switch terminal B
    • MTX:
      • Short to ground in wiring harness between MAIN 200 A fuse and brake switch terminal A
      • MAIN 200 A fuse and/or STOP 10 A fuse malfunction
      • Open circuit in wiring harness between battery positive terminal and brake switch terminal A
  • Short to ground in wiring harness between brake switch terminal D and PCM terminal 1G
  • PCM connector or terminals malfunction
  • Short to power supply in wiring harness between brake switch terminal D and PCM terminal 1G
  • Open circuit in wiring harness between brake switch terminal D and PCM terminal 1G
  • Brake switch No. 1 malfunction
  • PCM malfunction
G06940404
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