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Home >> Mitsubishi >> 2011 >> Eclipse Spyder L4-2.4L (4G69) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P0403

P0403




DTC P0403: Exhaust Gas Regulation Control Circuit


















CIRCUIT OPERATION

- The EGR valve power is supplied from the MFI relay (terminal No. 4).
- The ECM [M/T] or the PCM [A/T] (terminals No. 124, No. 130, No. 136, No. 142) drives the stepper motor by sequentially turning "ON" the power transistors in the ECM [M/T] or the PCM [A/T] and providing ground to the idle air control motor (terminal No. 1, No. 3, No. 4, No. 6).

TECHNICAL DESCRIPTION

- To judge if there is open circuit in the EGR valve (stepper motor) drive circuit, ECM [M/T] or PCM [A/T] measure the surge voltage of the EGR valve motor coil.

DESCRIPTIONS OF MONITOR METHODS

Off-surge does not occur after stepper motor is operated on to off.

MONITOR EXECUTION

Continuous

MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)

Other Monitor (There is no temporary DTC stored in memory for the item monitored below)

- Not applicable
Sensor (The sensor below is determined to be normal)

- Not applicable

DTC SET CONDITIONS

Logic Flow Chart






Check Conditions

- Battery positive voltage is higher than 10.3 volts.
- In a few seconds, just after ignition switch is turned to the "ON" position from the "LOCK"(OFF) position. (While EGR valve is being initialized.)
Judgement Criterion

- The EGR valve motor coil surge voltage (battery positive voltage +2 volts) is not detected for 3 seconds.
Check Conditions

- Battery positive voltage is higher than 10.3 volts.
- EGR valve is in operation after the engine starting process is complete.
Judgement Criterion

- The EGR valve motor coil surge voltage (battery positive voltage +2 volts) is not detected for 30 seconds.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 23 Monitors, Trips, Drive Cycles and Readiness Codes .

TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)

- EGR valve (stepper motor) failed.
- Open or shorted EGR valve (stepper motor) circuit, harness damage or connector damage.
- ECM failed.[ M/T]
- PCM failed.[ A/T]

DIAGNOSIS

Required Special Tools:

- MB991958: Scan tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: USB Cable
- MB991910: Main Harness A
- MB991658: Test Harness Set
- MB991923: Power Plant ECU Check Harness

STEP 1. Check harness connector B-105 at EGR valve for damage.





Q. Is the harness connector in good condition?

YES Go to Step 2.

NO Repair or replace it. Harness Connector Inspection.
Then go to Step 12.

STEP 2. Measure the EGR valve motor coil resistance.





(1)Disconnect the EGR valve connector B-105.





(2)Measure the resistance between EGR valve connector terminal No. 2 and either terminal No. 4 or terminal No. 6.
Standard value: 20 - 24ohms [at 20°C (68°F)]
(3)Measure the resistance between EGR valve connector terminal No. 5 and either terminal No. 1 or terminal No. 3.
Standard value: 20 - 24ohms [at 20°C (68°F)]
Q. Is the measured resistance between 20 and 24 ohms [at 20°C (68°F)]?

YES Go to Step 3.

NO Replace the EGR valve. Then go to Step 12.

STEP 3. Measure the power supply voltage at EGR valve harness side connector B-105.





(1)Disconnect the connector B-105 and measure at the harness side.
(2)Turn the ignition switch to the "ON" position.





(3)Measure the voltage between terminal No. 2, No. 5 and ground.

- Voltage should be battery positive voltage.
(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is battery positive voltage (approximately 12 volts) present?

YES Go to Step 5.

NO Go to Step 4.

STEP 4. Check harness connector B-16X at MFI relay for damage.





Q. Is the harness connector in good condition?

YES Repair harness wire between MFI relay connector B-16X (terminal No. 4) and EGR valve connector B-105 (terminal No. 2, No. 5) because of open circuit or short circuit to ground.
Then go to Step 12.

NO Repair or replace it. Harness Connector Inspection.
Then go to Step 12.

STEP 5. Measure the power supply voltage at ECM [M/T] or PCM [A/T] connector B-22 by using power plant ECU check harness special tool MB991923.









(1)Disconnect all ECM [M/T] connectors or PCM [A/T] connectors.
Connect the power plant ECU check harness special tool MB991923 between the separated connectors.





(2)Measure the voltage between terminal (No. 124, No. 130, No. 136, No. 142) and ground.

- The voltage should be between 5 and 8 volts for approximately 3 seconds when the Ignition switch is turned from the "LOCK" (OFF) position to the "ON" position.
(3)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the voltage normal?

YES Go to Step 8.

NO Go to Step 6.

STEP 6. Check harness connector B-22 at ECM [M/T] or PCM [A/T] for damage.





Q. Is the harness connector in good condition?

YES Go to Step 7.

NO Repair or replace it. Harness Connector Inspection.
Then go to Step 12.

STEP 7. Check for open circuit and short circuit to ground between EGR valve connector B-105 and ECM [M/T] or PCM [A/T] connector B-22.









1. EGR valve connector B-105 (terminal No. 1) and ECM [M/T] or PCM [A/T] connector B-22 (terminal No. 142).

2. EGR valve connector B-105 (terminal No. 3) and ECM [M/T] or PCM [A/T] connector B-22 (terminal No. 136).

3. EGR valve connector B-105 (terminal No. 4) and ECM [M/T] or PCM [A/T] connector B-22 (terminal No. 130).

4. EGR valve connector B-105 (terminal No. 6) and ECM [M/T] or PCM [A/T] connector B-22 (terminal No. 124).

Q. Is the harness wire in good condition?

YES Replace the ECM or the PCM. When the ECM or the PCM is replaced, register the encrypted code. Immobilizer System.
Then go to Step 12.

NO Repair it. Then go to Step 12.

STEP 8. Check harness connector B-22 at ECM [M/T] or PCM [A/T] for damage.





Q. Is the harness connector in good condition?

YES Go to Step 9.

NO Repair or replace it. Harness Connector Inspection.
Then go to Step 12.

STEP 9. Check the EGR valve operation using special tool MB991658.





(1)Remove the EGR valve.





(2)Connect special tool MB991658 to the EGR valve. (All terminals should be connected.)
(3)Use the jumper wires to connect terminal No. 5 of the EGR valve connector to the positive battery terminal.
(4)Check to ensure that the motor operates when the terminal No. 1 and No. 3 of the EGR valve connector are respectively connected to the negative battery terminal using a jumper wire.

- Vibration should be present at each application of voltage to test clip combination.
(5)Then, use jumper wires to connect the terminal No. 2 of the EGR valve connector to the positive battery terminal.
(6)Check to ensure that the motor operates when terminal No. 4 and No. 6 of the EGR valve connector are respectively connected to the negative battery terminal using a jumper wire.

- Vibration should be present at each application of voltage to test clip combination.
(7)Reinstall the EGR valve, using a new gasket, and tighten to the specified torque.
Tighten torque: 24± 3Nm [17± 3 ft-lb]
Q. Is the EGR valve operating properly?

YES Go to Step 10.

NO Replace the EGR valve. Then go to Step 12.

STEP 10. Check for harness damage between MFI relay connector B-16X (terminal No. 4) and EGR valve connector B-105 (terminal No. 2, No. 5).









Q. Is the harness wire in good condition?

YES Go to Step 11.

NO Repair it. Then go to Step 12.

STEP 11. Check for harness damage between EGR valve connector B-105 and ECM [M/T] or PCM [A/T] connector B-22.









5. EGR valve connector B-105 (terminal No. 1) and ECM [M/T] or PCM [A/T] connector B-22 (terminal No. 142).

6. EGR valve connector B-105 (terminal No. 3) and ECM [M/T] or PCM [A/T] connector B-22 (terminal No. 136).

7. EGR valve connector B-105 (terminal No. 4) and ECM [M/T] or PCM [A/T] connector B-22 (terminal No. 130).

8. EGR valve connector B-105 (terminal No. 6) and ECM [M/T] or PCM [A/T] connector B-22 (terminal No. 124).

Q. Is the harness wire in good condition?

YES Replace the ECM or the PCM. When the ECM or the PCM is replaced, register the encrypted code. Immobilizer System.
Then go to Step 12.

NO Repair it. Then go to Step 12.

STEP 12. Test the OBD-II drive cycle.

(1)Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 23 Monitors, Trips, Drive Cycles and Readiness Codes.

(2)Check the diagnostic trouble code (DTC).

Q. Is DTC P0403 set?

YES Retry the troubleshooting.
NO The inspection is complete.
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