DTC P0403: Notes

DTC P0403 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 4D Short to the power supply in the wiring harness between EGR valve terminal A and PCM terminal 4G Short to the power supply in the wiring harness between EGR valve terminal B and PCM terminal 4J Short to the power supply in the wiring harness between EGR valve terminal F and PCM terminal 4M Short to ground circuit in wiring harness between EGR valve terminal E and PCM terminal 4D Short to ground circuit in wiring harness between EGR valve terminal A and PCM terminal 4G Short to ground circuit in wiring harness between EGR valve terminal B and PCM terminal 4J Short to ground circuit in wiring harness between EGR valve terminal F and PCM terminal 4M Open circuit in the wiring harness between EGR valve terminal E and PCM terminal 4D Open circuit in the wiring harness between EGR valve terminal A and PCM terminal 4G Open circuit in the wiring harness between EGR valve terminal B and PCM terminal 4J Open circuit in the wiring harness between EGR valve terminal F and PCM terminal 4M Open circuit in the wiring harness between main relay terminal C and EGR valve terminal C Open circuit in the wiring harness between main relay terminal C 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 4D
Short to the power supply in the wiring harness between EGR valve terminal A and PCM terminal 4G
Short to the power supply in the wiring harness between EGR valve terminal B and PCM terminal 4J
Short to the power supply in the wiring harness between EGR valve terminal F and PCM terminal 4M
Short to ground circuit in wiring harness between EGR valve terminal E and PCM terminal 4D
Short to ground circuit in wiring harness between EGR valve terminal A and PCM terminal 4G
Short to ground circuit in wiring harness between EGR valve terminal B and PCM terminal 4J
Short to ground circuit in wiring harness between EGR valve terminal F and PCM terminal 4M
Open circuit in the wiring harness between EGR valve terminal E and PCM terminal 4D
Open circuit in the wiring harness between EGR valve terminal A and PCM terminal 4G
Open circuit in the wiring harness between EGR valve terminal B and PCM terminal 4J
Open circuit in the wiring harness between EGR valve terminal F and PCM terminal 4M
Open circuit in the wiring harness between main relay terminal C and EGR valve terminal C
Open circuit in the wiring harness between main relay terminal C and EGR valve terminal D
PCM malfunction

Courtesy of MAZDA MOTORS CORP.