Code No. P0403: Exhaust Gas Recirculation (EGR) Control Solenoid Valve

OPERATION

Power is supplied to the exhaust gas recirculation control solenoid valve (terminal No. 1) from the engine control relay (terminal No. 1).

The engine-A/T-ECU (terminal No. 6) makes the power transistor in the unit be in "ON", and that makes currents go on the exhaust gas recirculation control solenoid valve (terminal No. 2).

FUNCTION

In response to the signal from the engine-A/T-ECU, the exhaust gas recirculation control solenoid valve controls the operation of the exhaust gas recirculation valve.

TROUBLE JUDGMENT

Check Condition

Battery voltage 10 V or more.

Judgment Criterion

When the EGR control solenoid valve is turned to "OFF" position from "ON" position, none of solenoid coil surge voltage (battery voltage of +2 V) is detected.

PROBABLE CAUSE

Failed EGR control solenoid valve

Open/short circuit in EGR control solenoid valve circuit or loose connector contact

Failed engine-A/T-ECU

DIAGNOSIS PROCEDURE

STEP 1. MUT-II/III actuator test

Refer to Actuator test reference table list .

Item 10: Exhaust gas recirculation control solenoid valve

OK: Operating sound can be heard and the valve vibrates.

Q: Is the check result normal?

YES: Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points

).
NO: Go to Step 2

STEP 2. Connector check: B-102 EGR control solenoid valve connector

Q: Is the check result normal?

YES: Go to Step 3

.
NO: Repair.

STEP 3. Perform resistance measurement at B-102 EGR control solenoid valve connector.

Disconnect connector, and measure at solenoid valve side.

Resistance between terminal No. 1 and No. 2.

OK: 29 - 35 Ω (at 20°C)

Q: Is the check result normal?

YES: Go to Step 4

.
NO: Replace EGR control solenoid valve.

STEP 4. Perform voltage measurement at B-102 EGR control solenoid valve connector.

Disconnect connector, and measure at harness side.

Ignition switch: ON

Voltage between terminal No. 1 and earth.

OK: System voltage

Q: Is the check result normal?

YES: Go to Step 6

.
NO: Go to Step 5

STEP 5. Connector check: B-17X engine control relay connector

Q: Is the check result normal?

YES:

Check and repair harness between B-102 (terminal No. 1) EGR control solenoid valve connector and B-17X (terminal No. 1) engine control relay connector.

Check power supply line for open/short circuit.

NO: Repair.

STEP 6. Perform resistance measurement at C-112 engine-A/T-ECU connector.

Disconnect connector, and measure at harness side.

Ignition switch: ON

Voltage between terminal No. 6 and earth.

OK: System voltage

Q: Is the check result normal?

YES: Go to Step 8

.
NO: Go to Step 7

STEP 7. Connector check: C-112 engine-A/T-ECU connector

Q: Is the check result normal?

YES:

Check and repair harness between B-102 (terminal No. 2) EGR control solenoid valve connector and C-112 (terminal No. 6) engine-A/T-ECU connector.

Check output line for open/short circuit.

NO: Repair.

STEP 8. Connector check: C-112 engine-A/T-ECU connector

Q: Is the check result normal?

YES: Go to Step 9

.
NO: Repair.

STEP 9. Check harness between B-102 (terminal No. 2) exhaust gas recirculation control solenoid valve connector and C-112 (terminal No. 6) engine-A/T-ECU connector.

Check output line for damage.

Q: Is the check result normal?

YES: Go to Step 10

.
NO: Repair.

STEP 10. Check harness between B-102 (terminal No. 1) exhaust gas recirculation control solenoid valve connector and B-17X (terminal No. 1) engine control relay connector.

Check power supply line for damage.

Q: Is the check result normal?

YES: Go to Step 11

.
NO: Repair.

STEP 11. MUT-II/III actuator test

Refer to actuator test reference table list .

Item 10: Exhaust gas recirculation control solenoid valve

OK: Operating sound can be heard and the valve vibrates.

Q: Is the check result normal?

YES: Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points

).
NO: Replace engine-A/T-ECU.


Code No. P0403: Exhaust Gas Recirculation (EGR) Control Solenoid Valve

OPERATION Power is supplied to the exhaust gas recirculation control solenoid valve (terminal No. 1) from the engine control relay (terminal No. 1). The engine-A/T-ECU (terminal No. 6) makes the power transistor in the unit be in "ON", and that makes currents go on the exhaust gas recirculation control solenoid valve (terminal No. 2).
FUNCTION In response to the signal from the engine-A/T-ECU, the exhaust gas recirculation control solenoid valve controls the operation of the exhaust gas recirculation valve.
TROUBLE JUDGMENT Check Condition Battery voltage 10 V or more. Judgment Criterion When the EGR control solenoid valve is turned to "OFF" position from "ON" position, none of solenoid coil surge voltage (battery voltage of +2 V) is detected.
PROBABLE CAUSE Failed EGR control solenoid valve Open/short circuit in EGR control solenoid valve circuit or loose connector contact Failed engine-A/T-ECU
	DIAGNOSIS PROCEDURE

	STEP 1. MUT-II/III actuator test Refer to Actuator test reference table list . Item 10: Exhaust gas recirculation control solenoid valve OK: Operating sound can be heard and the valve vibrates. Q: Is the check result normal? YES: Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points ). NO: Go to Step 2 .
	STEP 2. Connector check: B-102 EGR control solenoid valve connector
	Q: Is the check result normal? YES: Go to Step 3 . NO: Repair.
	STEP 3. Perform resistance measurement at B-102 EGR control solenoid valve connector.
	Disconnect connector, and measure at solenoid valve side. Resistance between terminal No. 1 and No. 2. OK: 29 - 35 Ω (at 20°C) Q: Is the check result normal? YES: Go to Step 4 . NO: Replace EGR control solenoid valve.
	STEP 4. Perform voltage measurement at B-102 EGR control solenoid valve connector.
	Disconnect connector, and measure at harness side. Ignition switch: ON Voltage between terminal No. 1 and earth. OK: System voltage Q: Is the check result normal? YES: Go to Step 6 . NO: Go to Step 5 .
	STEP 5. Connector check: B-17X engine control relay connector
	Q: Is the check result normal? YES: Check and repair harness between B-102 (terminal No. 1) EGR control solenoid valve connector and B-17X (terminal No. 1) engine control relay connector. Check power supply line for open/short circuit. NO: Repair.
	STEP 6. Perform resistance measurement at C-112 engine-A/T-ECU connector.
	Disconnect connector, and measure at harness side. Ignition switch: ON Voltage between terminal No. 6 and earth. OK: System voltage Q: Is the check result normal? YES: Go to Step 8 . NO: Go to Step 7 .
	STEP 7. Connector check: C-112 engine-A/T-ECU connector
	Q: Is the check result normal? YES: Check and repair harness between B-102 (terminal No. 2) EGR control solenoid valve connector and C-112 (terminal No. 6) engine-A/T-ECU connector. Check output line for open/short circuit. NO: Repair.
	STEP 8. Connector check: C-112 engine-A/T-ECU connector
	Q: Is the check result normal? YES: Go to Step 9 . NO: Repair.
	STEP 9. Check harness between B-102 (terminal No. 2) exhaust gas recirculation control solenoid valve connector and C-112 (terminal No. 6) engine-A/T-ECU connector.
	Check output line for damage. Q: Is the check result normal? YES: Go to Step 10 . NO: Repair.
	STEP 10. Check harness between B-102 (terminal No. 1) exhaust gas recirculation control solenoid valve connector and B-17X (terminal No. 1) engine control relay connector.
	Check power supply line for damage. Q: Is the check result normal? YES: Go to Step 11 . NO: Repair.
	STEP 11. MUT-II/III actuator test Refer to actuator test reference table list . Item 10: Exhaust gas recirculation control solenoid valve OK: Operating sound can be heard and the valve vibrates. Q: Is the check result normal? YES: Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points ). NO: Replace engine-A/T-ECU.