DTC P0403 [L3]: Notes

DTC P0403 (L3) DETECTION CONDITION & POSSIBLE CAUSES

DTC P0403	EGR valve (stepper motor) circuit malfunction
DETECTION CONDITION	The PCM monitors the input voltage from EGR valve. If voltage at PCM terminals 2AX, 2BA, 2AT and/or 2AW remain low or high, the PCM determines that the EGR valve 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	EGR valve connector or terminal malfunction Open circuit in wiring harness between main relay and EGR valve terminal C Open circuit in wiring harness between main relay and EGR valve terminal D EGR valve malfunction Short to ground circuit in wiring harness between EGR valve terminal E and PCM terminal 2AX Short to ground circuit in wiring harness between EGR valve terminal A and PCM terminal 2BA Short to ground circuit in wiring harness between EGR valve terminal B and PCM terminal 2AT Short to ground circuit in wiring harness between EGR valve terminal F and PCM terminal 2AW PCM connection 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 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

DTC P0403

EGR valve (stepper motor) circuit malfunction

DETECTION CONDITION

The PCM monitors the input voltage from EGR valve. If voltage at PCM terminals 2AX, 2BA, 2AT and/or 2AW remain low or high, the PCM determines that the EGR valve 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

EGR valve connector or terminal malfunction
Open circuit in wiring harness between main relay and EGR valve terminal C
Open circuit in wiring harness between main relay and EGR valve terminal D
EGR valve malfunction
Short to ground circuit in wiring harness between EGR valve terminal E and PCM terminal 2AX
Short to ground circuit in wiring harness between EGR valve terminal A and PCM terminal 2BA
Short to ground circuit in wiring harness between EGR valve terminal B and PCM terminal 2AT
Short to ground circuit in wiring harness between EGR valve terminal F and PCM terminal 2AW
PCM connection 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
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