DTC P0403:00 [ZY, Z6]

id0102c7704300

DTC P0403:00

EGR control circuit problem

DETECTION CONDITION

•  If the voltage of the EGR valve control signal remains low or high, the PCM determines that there is the EGR valve control circuit problem.

Diagnostic support note

•  This is a continuous monitor (CCM).

•  The 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 (Mode 2)/Snapshot data is available.

•  The DTC is stored in the PCM memory.

POSSIBLE CAUSE

•  EGR valve connector or terminals malfunction

•  Short to ground in wiring harness between the following terminals:

―  EGR valve terminal C—PCM terminal 2BC

―  EGR valve terminal D—PCM terminal 2BC

―  EGR valve terminal E—PCM terminal 2K

―  EGR valve terminal A—PCM terminal 2O

―  EGR valve terminal B—PCM terminal 2P

―  EGR valve terminal F—PCM terminal 2T

•  PCM connector or terminals malfunction

•  Short to power supply in wiring harness between the following terminals:

―  EGR valve terminal E—PCM terminal 2K

―  EGR valve terminal A—PCM terminal 2O

―  EGR valve terminal B—PCM terminal 2P

―  EGR valve terminal F—PCM terminal 2T

•  EGR valve malfunction

•  Open circuit in wiring harness between the following terminals:

―  EGR valve terminal C—PCM terminal 2BC

―  EGR valve terminal D—PCM terminal 2BC

―  EGR valve terminal E—PCM terminal 2K

―  EGR valve terminal A—PCM terminal 2O

―  EGR valve terminal B—PCM terminal 2P

―  EGR valve terminal F—PCM terminal 2T

•  PCM malfunction

DTC P0403:00	EGR control circuit problem
DETECTION CONDITION	• If the voltage of the EGR valve control signal remains low or high, the PCM determines that there is the EGR valve control circuit problem. Diagnostic support note • This is a continuous monitor (CCM). • The 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 (Mode 2)/Snapshot data is available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE	• EGR valve connector or terminals malfunction • Short to ground in wiring harness between the following terminals: ― EGR valve terminal C—PCM terminal 2BC ― EGR valve terminal D—PCM terminal 2BC ― EGR valve terminal E—PCM terminal 2K ― EGR valve terminal A—PCM terminal 2O ― EGR valve terminal B—PCM terminal 2P ― EGR valve terminal F—PCM terminal 2T • PCM connector or terminals malfunction • Short to power supply in wiring harness between the following terminals: ― EGR valve terminal E—PCM terminal 2K ― EGR valve terminal A—PCM terminal 2O ― EGR valve terminal B—PCM terminal 2P ― EGR valve terminal F—PCM terminal 2T • EGR valve malfunction • Open circuit in wiring harness between the following terminals: ― EGR valve terminal C—PCM terminal 2BC ― EGR valve terminal D—PCM terminal 2BC ― EGR valve terminal E—PCM terminal 2K ― EGR valve terminal A—PCM terminal 2O ― EGR valve terminal B—PCM terminal 2P ― EGR valve terminal F—PCM terminal 2T • PCM malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA (MODE 2)/SNAPSHOT DATA HAS BEEN RECORDED • Has the FREEZE FRAME DATA (Mode 2)/snapshot data been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA (Mode 2)/snapshot data on repair order, then go to the next step.
2	VERIFY RELATED SERVICE INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available?	Yes	Perform repair or diagnosis according to the available Service Information. • If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	INSPECT EGR VALVE CONNECTOR AND TERMINALS • Switch the ignition to off. • Disconnect the EGR valve connector. • Inspect for poor connection (such as damaged/pulled-out pins, and corrosion). • Is there any malfunction?	Yes	Repair or replace the connector or terminals, then go to Step 9.
3		No	Go to the next step.
4	INSPECT EGR VALVE CIRCUIT FOR SHORT TO GROUND • EGR valve connector is disconnected. • Inspect for continuity between the following terminals (wiring harness-side) and body ground: ― EGR valve terminal C ― EGR valve terminal D ― EGR valve terminal E ― EGR valve terminal A ― EGR valve terminal B ― EGR valve terminal F • Is there continuity?	Yes	If the short to ground circuit could be detected: • Repair or replace the wiring harness for a possible short to ground. If the short to ground circuit could not be detected: • Replace the PCM (short to ground in PCM internal circuit). (See PCM REMOVAL/INSTALLATION [ZY, Z6].) Go to Step 9.
4		No	Go to the next step.
5	INSPECT PCM CONNECTOR AND TERMINALS • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, and corrosion). • Is there any malfunction?	Yes	Repair or replace the connector or terminals, then go to Step 9.
5		No	Go to the next step.
6	INSPECT EGR VALVE CONTROL CIRCUIT FOR SHORT TO POWER SUPPLY • EGR valve and PCM connectors are disconnected. • Switch the ignition to ON (engine off). • Measure the voltage between the following terminals (wiring harness-side) and body ground: ― EGR valve terminal E ― EGR valve terminal A ― EGR valve terminal B ― EGR valve terminal F • Is there any voltage?	Yes	Repair or replace the wiring harness for a possible short to power supply, then go to Step 9.
6		No	Go to the next step.
7	INSPECT EGR VALVE • Switch the ignition to off. • Inspect the EGR valve. (See EGR VALVE INSPECTION [ZY, Z6].) • Is there any malfunction?	Yes	Replace the EGR valve, then go to Step 9. (See EGR VALVE REMOVAL/INSTALLATION [ZY, Z6].)
7		No	Go to the next step.
8	INSPECT EGR VALVE CIRCUIT FOR OPEN CIRCUIT • EGR valve and PCM connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side): ― EGR valve terminal C—PCM terminal 2BC ― EGR valve terminal D—PCM terminal 2BC ― EGR valve terminal E—PCM terminal 2K ― EGR valve terminal A—PCM terminal 2O ― EGR valve terminal B—PCM terminal 2P ― EGR valve terminal F—PCM terminal 2T • Is there continuity?	Yes	Go to the next step.
8		No	Repair or replace the wiring harness for a possible open circuit, then go to the next step.
9	VERIFY DTC TROUBLESHOOTING COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE [ZY, Z6].) • Start the engine. • Perform the KOEO/KOER self test. (See KOEO/KOER SELF TEST [ZY, Z6].) • Is the PENDING CODE for this DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [ZY, Z6].)
9		No	Go to the next step.
10	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [ZY, Z6].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [ZY, Z6].)
10		No	DTC troubleshooting completed.