DTC Diagnosis Procedure

If DTC P26A7 is displayed with DTC P0643, first perform the confirmation procedure (trouble diagnosis) for DTC P0643.

Is DTC P0643 detected?

YES

Perform diagnosis for P0643. Refer to DTC Description .

NO

GO TO 2.

1. Turn ignition switch OFF.
2. Disconnect multi-way control valve harness connector.
3. Turn ignition switch ON.
4. Check the voltage between multi-way control valve harness connector and ground.

   +		-	Voltage (Approx.)
   Multi-way control valve
   Connector	Terminal
   F117	5	Ground	5 V

Is the inspection result normal?

YES

GO TO 4.

NO

GO TO 3.

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between multi-way control valve harness connector and ECM harness connector.

   Multi-way control valve		ECM		Continuity
   Connector	Terminal	Connector	Terminal
   F117	5	F143	38	Existed

4. Also check harness for short to power and short to ground.

Is the inspection result normal?

YES

Perform the trouble diagnosis for ECM power supply circuit. Refer to Diagnosis Procedure .

NO

Repair or replace error-detected parts.

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between multi-way control valve harness connector and ECM harness connector.

   Multi-way control valve		ECM		Continuity
   Connector	Terminal	Connector	Terminal
   F117	3	F142	97	Existed

4. Also check harness for short to power.

Is the inspection result normal?

YES

GO TO 5.

NO

Repair or replace error-detected parts.

1. Check the continuity between multi-way control valve harness connector and ECM harness connector.

   Multi-way control valve		ECM		Continuity
   Connector	Terminal	Connector	Terminal
   F117	4	F143	69	Existed

2. Also check harness for short to power and short to ground.

Is the inspection result normal?

YES

GO TO 6.

NO

Repair or replace error-detected parts.

Check the multi-way control valve position sensor. Refer to Component Inspection .

Is the inspection result normal?

YES

INSPECTION END

NO

Replace multi-way control valve. Refer to MULTI-WAY CONTROL VALVE : Removal & Installation .