DTC P0403:00 [L8, LF, L5]

id010242704300

DTC P0403:00

EGR control circuit problem

DETECTION CONDITION

•  The PCM monitors the input voltage from 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 malfunction

•  Connector 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

•  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

•  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

•  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

•  PCM malfunction

DTC P0403:00	EGR control circuit problem
DETECTION CONDITION	• The PCM monitors the input voltage from 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 malfunction • Connector 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 • 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 • 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 • 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 • PCM malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME on the 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 POOR CONNECTION OF EGR VALVE CONNECTOR • Switch the ignition to off. • Disconnect the EGR valve connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the terminal and/or connector, then go to Step 10.
3		No	Go to the next step.
4	INSPECT POWER CIRCUIT FOR OPEN CIRCUIT • Switch the ignition to ON (Engine off). • Measure the voltage following terminal and body ground. ― EGR valve terminal C ― EGR valve terminal D • Is the voltage B+?	Yes	Go to the next step.
4		No	Repair or replace the wiring harness for an open circuit then go to Step 10.
5	INSPECT EGR VALVE • Inspect the EGR valve. (See EGR VALVE INSPECTION [L8, LF, L5].) • Is the EGR valve normal?	Yes	Go to the next step.
5		No	Replace the EGR valve, then go to Step 10. (See EGR VALVE REMOVAL/INSTALLATION [L8, LF, L5].)
6	INSPECT FOR CONTROL CIRCUIT FOR SHORT TO GROUND • Switch the ignition to off. • Inspect for continuity between the following terminal and body ground: ― EGR valve terminal E ― EGR valve terminal A ― EGR valve terminal B ― EGR valve terminal F • is there continuity?	Yes	Repair or replace the wiring harness for short to ground, then go to Step 10.
6		No	Go to the next step.
7	INSPECT FOR CONTROL CIRCUIT FOR SHORT TO POWER • Switch the ignition to ON (Engine off). • Measure the voltage following terminal and body ground: ― EGR valve terminal E ― EGR valve terminal A ― EGR valve terminal B ― EGR valve terminal F • Is the voltage B+?	Yes	Repair or replace the wiring harness for short to power supply, then go to Step 10.
7		No	Go to the next step.
8	INSPECT POOR CONNECTION OF PCM CONNECTOR • Switch the ignition to off. • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the terminal and/or connector, then go to Step 10.
8		No	Go to the next step.
9	INSPECT CONTROL CIRCUIT FOR OPEN CIRCUIT • Remove the PCM with the PCM connector connected. • Inspect for continuity following terminals: ― Between EGR valve terminal E and PCM terminal 2AX ― Between EGR valve terminal A and PCM terminal 2BA ― Between EGR valve terminal B and PCM terminal 2AT ― Between EGR valve terminal F and PCM terminal 2AW • Is there continuity?	Yes	Go to the next step.
9		No	Repair or replace the wiring harness for an open circuit then go to the next step.
10	VERIFY TROUBLESHOOTING OF DTC P0403:00 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. • Start the engine. • Is the PENDING CODE for this DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [L8, LF, L5].)
10		No	Go to the next step.
11	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [L8, LF, L5].) • Are any DTC present?	Yes	Go to the applicable DTC troubleshooting. (See DTC TABLE [L8, LF, L5].)
11		No	Troubleshooting completed.