Diagnosis Procedure

If DTC P0059 is displayed with DTC P0051, P0052 or P0150, first perform the confirmation procedure (trouble diagnosis) for DTC P0051, P0052 or P0150.

Is applicable DTC detected?

YES

Perform diagnosis of applicable.

• P0051: Refer to DTC Description .
• P0052: Refer to DTC Description .
• P0150: Refer to DTC Description .

NO

GO TO 2.

1. Disconnect air fuel ratio (A/F) sensor 1 harness connector.
2. Turn ignition switch ON.
3. Check the voltage between A/F sensor 1 harness connector and ground.

   +		-	Voltage
   A/F sensor 1
   Connector	Terminal
   F61	1	Ground	Battery voltage

Is the inspection result normal?

YES

GO TO 4.

NO

GO TO 3.

1. Turn ignition switch OFF.
2. Disconnect IPDM E/R harness connector.
3. Check the continuity between A/F sensor 1 harness connector and IPDM E/R harness connector.

Is the inspection result normal?

YES

Perform the trouble diagnosis for power supply circuit.

NO

Repair or replace error-detected parts.

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between A/F sensor 1 harness connector and ECM harness connector.

   A/F sensor 1		ECM		Continuity
   Connector	Terminal	Connector	Terminal
   F61	2	F13	46	Existed

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

Is the inspection result normal?

YES

GO TO 5.

NO

Repair open circuit, short to ground or short to power in harness or connectors.

Check A/F sensor 1 heater. Refer to Component Inspection .

Is the inspection result normal?

YES

INSPECTION END

NO

Replace malfunctioning air fuel ratio (A/F) sensor 1. Refer to Removal and Installation (bank 2) , Removal and Installation (bank 1) .