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DTC P0403:00: Notes

DTC P0403:00 EGR control circuit problem
DETECTION CONDITION 
  • The PCM monitors the input voltage from the EGR valve. If the voltage remain low or high, the PCM determines that the EGR valve circuit has a malfunction.

    Diagnostic support note 

  • This is a continuous monitor (CCM).
  • The MIL illuminates if the PCM detects the above malfunction conditions 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 
  • EGR valve connector or terminal malfunction
  • Short to ground or open circuit in EGR valve power supply circuit
    • Short to ground in wiring harness between main relay terminal D and EGR valve terminal C
    • Short to ground in wiring harness between main relay terminal D and EGR valve terminal D
    • ENGINE 10 A fuse malfunction
    • Open circuit in wiring harness between main relay terminal D and EGR valve terminal C
    • Open circuit in wiring harness between main relay terminal D and EGR valve terminal D
  • Short to ground in wiring harness between EGR valve terminal E and PCM terminal 2AX
  • Short to ground in wiring harness between EGR valve terminal A and PCM terminal 2BA
  • Short to ground in wiring harness between EGR valve terminal B and PCM terminal 2AT
  • Short to ground in wiring harness between EGR valve terminal F and PCM terminal 2AW
  • PCM connector or terminal malfunction
  • Short to power supply in wiring harness between EGR valve terminal E and PCM terminal 2AX
  • Short to power supply in wiring harness between EGR valve terminal A and PCM terminal 2BA
  • Short to power supply in wiring harness between EGR valve terminal B and PCM terminal 2AT
  • Short to power supply in wiring harness between EGR valve terminal F and PCM terminal 2AW
  • EGR valve malfunction
  • Open circuit in wiring harness between EGR valve terminal E and PCM terminal 2AX
  • Open circuit in wiring harness between EGR valve terminal A and PCM terminal 2BA
  • Open circuit in wiring harness between EGR valve terminal B and PCM terminal 2AT
  • Open circuit in wiring harness between EGR valve terminal F and PCM terminal 2AW
  • PCM malfunction
G08142300
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