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DTC P0703 [L3]: Notes

DTC P0703 (L3) DETECTION CONDITION & POSSIBLE CAUSES

DTC P0703 Brake switch input circuit problem
DETECTION CONDITION 
  • The PCM monitors changes in input voltage from the brake switch. If the PCM does not detect PCM terminal 1AB 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).
  • 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 the first drive cycle.
  • FREEZE FRAME DATA is available.
  • The DTC. is stored in the PCM memory.
POSSIBLE CAUSE 
  • Poor connection of brake switch connector
  • Brake switch malfunction
  • Open circuit in wiring harness between battery positive terminal and brake switch terminal A
  • PCM connector or terminal malfunction
  • Open circuit in wiring harness between brake switch terminal D and PCM connector terminal 1AB
  • Short to power supply in wiring harness between brake switch terminal D and PCM connector terminal 1AB
  • PCM malfunction
G06149054
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