DTC P0403:00 [L5]: Notes

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

DETECTION CONDITION & POSSIBLE CAUSES

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 is available The DTC is stored in the PCM memory.
POSSIBLE CAUSE	EGR valve connector or terminal malfunction 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 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 PCM connector or terminal malfunction 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 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
Courtesy of MAZDA MOTORS CORP.

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 is available
The DTC is stored in the PCM memory.

POSSIBLE CAUSE

EGR valve connector or terminal malfunction
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
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
PCM connector or terminal malfunction
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
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

Courtesy of MAZDA MOTORS CORP.