DTC P0403: Notes

DTC P0403[L3 WITH TC] DETECTION CONDITION AND POSSIBLE CAUSES

DTC P0403	EGR valve (stepper motor) circuit malfunction
DETECTION CONDITION	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). MIL illuminates if the PCM detects 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 not available. DTCs are not stored in the PCM memory.
POSSIBLE CAUSE	EGR valve malfunction Connector or terminal malfunction Short to the power supply in the wiring harness between EGR valve terminal E and PCM terminal 2AQ Short to the power supply in the wiring harness between EGR valve terminal A and PCM terminal 2AM Short to the power supply in the wiring harness between EGR valve terminal B and PCM terminal 2AR Short to the power supply in the wiring harness between EGR valve terminal F and PCM terminal 2AN Short to ground circuit in wiring harness between EGR valve terminal E and PCM terminal 2AQ Short to ground circuit in wiring harness between EGR valve terminal A and PCM terminal 2AM Short to ground circuit in wiring harness between EGR valve terminal B and PCM terminal 2AR Short to ground circuit in wiring harness between EGR valve terminal F and PCM terminal 2AN Open circuit in the wiring harness between EGR valve terminal E and PCM terminal 2AQ Open circuit in the wiring harness between EGR valve terminal A and PCM terminal 2AM Open circuit in the wiring harness between EGR valve terminal B and PCM terminal 2AR Open circuit in the wiring harness between EGR valve terminal F and PCM terminal 2AN Open circuit in the wiring harness between main relay terminal D and EGR valve terminal C Open circuit in the wiring harness between main relay terminal D and EGR valve terminal D PCM malfunction
Courtesy of MAZDA MOTORS CORP.

DTC P0403

EGR valve (stepper motor) circuit malfunction

DETECTION CONDITION

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).
MIL illuminates if the PCM detects 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 not available.
DTCs are not stored in the PCM memory.

POSSIBLE CAUSE

EGR valve malfunction
Connector or terminal malfunction
Short to the power supply in the wiring harness between EGR valve terminal E and PCM terminal 2AQ
Short to the power supply in the wiring harness between EGR valve terminal A and PCM terminal 2AM
Short to the power supply in the wiring harness between EGR valve terminal B and PCM terminal 2AR
Short to the power supply in the wiring harness between EGR valve terminal F and PCM terminal 2AN
Short to ground circuit in wiring harness between EGR valve terminal E and PCM terminal 2AQ
Short to ground circuit in wiring harness between EGR valve terminal A and PCM terminal 2AM
Short to ground circuit in wiring harness between EGR valve terminal B and PCM terminal 2AR
Short to ground circuit in wiring harness between EGR valve terminal F and PCM terminal 2AN
Open circuit in the wiring harness between EGR valve terminal E and PCM terminal 2AQ
Open circuit in the wiring harness between EGR valve terminal A and PCM terminal 2AM
Open circuit in the wiring harness between EGR valve terminal B and PCM terminal 2AR
Open circuit in the wiring harness between EGR valve terminal F and PCM terminal 2AN
Open circuit in the wiring harness between main relay terminal D and EGR valve terminal C
Open circuit in the wiring harness between main relay terminal D and EGR valve terminal D
PCM malfunction

Courtesy of MAZDA MOTORS CORP.