DTC Diagnosis Procedure

If DTC P0237 is displayed with DTC P0643, first perform the confirmation procedure (trouble diagnosis) for DTC P0643.

Is DTC P0643 detected?

YES

Perform diagnosis of applicable. Refer to DTC Description .

NO

GO TO 2.

1. Disconnect turbocharger boost sensor harness connector.
2. Turn ignition switch ON.
3. Check the voltage between turbocharger boost sensor harness connector and ground.

   +		-	Voltage (Approx.)
   Turbocharger boost sensor
   Connector	Terminal
   F90	2	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 turbocharger boost sensor harness connector and ECM harness connector.

   Turbocharger boost sensor		ECM		Continuity
   Connector	Terminal	Connector	Terminal
   F90	2	F142	130	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 turbocharger boost sensor harness connector and ECM harness connector.

   Turbocharger boost sensor		ECM		Continuity
   Connector	Terminal	Connector	Terminal
   F90	4	F142	99	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 ECM harness connector and ground.

   ECM		--	Continuity
   Connector	Terminal
   F143	3	Ground	Existed
   F142	87
   	88
   E152	199
   	201
   	204

2. Also check harness for short to power.

Is the inspection result normal?

YES

GO TO 6.

NO

Repair or replace error-detected parts.

1. Check the continuity between turbocharger boost sensor harness connector and ECM harness connector.

   Turbocharger boost sensor		ECM		Continuity
   Connector	Terminal	Connector	Terminal
   F90	1	F142	116	Existed

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

Is the inspection result normal?

YES

GO TO 7.

NO

Repair or replace error-detected parts.

Check the turbocharger boost sensor. Refer to Component Inspection .

Is the inspection result normal?

YES

INSPECTION END

NO

Replace malfunctioning turbocharger boost sensor. Refer to CHARGE AIR COOLER : Exploded View .