Inspection Procedure 35: Waste Gate Solenoid Valve System <DOHC>

CONDITION

Power is supplied from the engine control relay (terminal No. 1) to the waste gate solenoid valve (terminal No. 1).

The engine-A/T-ECU (terminal No. 86) causes the power transistor in the unit to be ON to supply power to the waste gate solenoid valve (terminal No. 2).

FUNCTION

In response to a signal from the engine-A/T-ECU, the waste gate solenoid valve controls the turbo charge pressure to be introduced into the waste gate actuator of the turbo charger.

PROBABLE CAUSE

Failed waste gate solenoid valve

Open/short circuit in waste gate solenoid valve sensor circuit or loose connector contact

Failed engine-A/T-ECU

DIAGNOSIS PROCEDURE

STEP 1. MUT-II/III actuator test

Refer to Actuator reference table list .

Item 12: Waste gate 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-115 waste gate solenoid valve connector

Q: Is the check result normal?

YES: Go to Step 3

.
NO: Repair.

STEP 3. Perform resistance measurement at B-115 waste gate 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 waste gate solenoid valve.

STEP 4. Perform resistance measurement at B-115 waste gate solenoid valve connector.

Disconnect connector, and measure at harness side.

Ignition switch: ON

Voltage between terminal No. 1 and earth.

OK: Battery 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 intermediate connector C-17, and repair if necessary. If intermediate connector is normal, check and repair harness between B-115 (terminal No. 1) waste gate 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 voltage measurement at C-110 engine-A/T-ECU connector.

Disconnect connector, and measure at harness side.

Ignition switch: ON

Voltage between terminal No. 86 and earth.

OK: Battery voltage

Q: Is the check result normal?

YES: Go to Step 8

.
NO: Go to Step 7

STEP 7. Connector check: C-110 engine-A/T-ECU connector

Q: Is the check result normal?

YES:

Check and repair harness between B-115 (terminal No. 2) waste gate solenoid valve connector and C-110 (terminal No. 86) engine-A/T-ECU connector.

Check output line for open/short circuit.

NO: Repair.

STEP 8. Connector check: C-110 engine-A/T-ECU connector

Q: Is the check result normal?

YES: Go to Step 9

.
NO: Repair.

STEP 9. Check harness between B-115 (terminal No. 2) waste gate solenoid valve connector and C-110 (terminal No. 86) 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-115 (terminal No. 1) waste gate solenoid valve connector and B-17X (terminal No. 1) engine control relay connector.

NOTE: Before checking harness, check intermediate connector C-17, and repair if necessary.

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 12: Waste gate 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.


Inspection Procedure 35: Waste Gate Solenoid Valve System <DOHC>

CONDITION Power is supplied from the engine control relay (terminal No. 1) to the waste gate solenoid valve (terminal No. 1). The engine-A/T-ECU (terminal No. 86) causes the power transistor in the unit to be ON to supply power to the waste gate solenoid valve (terminal No. 2).
FUNCTION In response to a signal from the engine-A/T-ECU, the waste gate solenoid valve controls the turbo charge pressure to be introduced into the waste gate actuator of the turbo charger.
PROBABLE CAUSE Failed waste gate solenoid valve Open/short circuit in waste gate solenoid valve sensor circuit or loose connector contact Failed engine-A/T-ECU
	DIAGNOSIS PROCEDURE

	STEP 1. MUT-II/III actuator test Refer to Actuator reference table list . Item 12: Waste gate 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-115 waste gate solenoid valve connector
	Q: Is the check result normal? YES: Go to Step 3 . NO: Repair.
	STEP 3. Perform resistance measurement at B-115 waste gate 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 waste gate solenoid valve.
	STEP 4. Perform resistance measurement at B-115 waste gate solenoid valve connector.
	Disconnect connector, and measure at harness side. Ignition switch: ON Voltage between terminal No. 1 and earth. OK: Battery 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 intermediate connector C-17, and repair if necessary. If intermediate connector is normal, check and repair harness between B-115 (terminal No. 1) waste gate 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 voltage measurement at C-110 engine-A/T-ECU connector.
	Disconnect connector, and measure at harness side. Ignition switch: ON Voltage between terminal No. 86 and earth. OK: Battery voltage Q: Is the check result normal? YES: Go to Step 8 . NO: Go to Step 7 .
	STEP 7. Connector check: C-110 engine-A/T-ECU connector
	Q: Is the check result normal? YES: Check and repair harness between B-115 (terminal No. 2) waste gate solenoid valve connector and C-110 (terminal No. 86) engine-A/T-ECU connector. Check output line for open/short circuit. NO: Repair.
	STEP 8. Connector check: C-110 engine-A/T-ECU connector
	Q: Is the check result normal? YES: Go to Step 9 . NO: Repair.
	STEP 9. Check harness between B-115 (terminal No. 2) waste gate solenoid valve connector and C-110 (terminal No. 86) 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-115 (terminal No. 1) waste gate solenoid valve connector and B-17X (terminal No. 1) engine control relay connector.
	NOTE: Before checking harness, check intermediate connector C-17, and repair if necessary. 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 12: Waste gate 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.