Nissan Murano: Dtc/circuit Diagnosis / P0053 A/f Sensor 1 Heater

DTC Description

DTC DETECTION LOGIC

POSSIBLE CAUSE

• Harness and connectors [A/F sensor 1 (bank 1) heater circuit is open or shorted.]

• A/F sensor 1 (bank 1) heater

FAIL-SAFE

Not applicable

DTC CONFIRMATION PROCEDURE

CHECK DTC PRIORITY

If DTC P0053 is displayed with DTC 0031, 0032 or P0130, first perform the confirmation procedure (trouble diagnosis) for DTC 0031, 0032 or P0130.

Is DTC P0031, P0032 or P0130 detected?

Perform diagnosis of applicable.

• P0130: Refer to DTC Description.

• P0031: Refer to DTC Description.

• P0032: Refer to DTC Description.

GO TO 2.

PRECONDITIONING

When DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test.

1. Turn ignition switch OFF and wait at least 10 seconds.

2. Turn ignition switch ON.

3. Turn ignition switch OFF and wait at least 10 seconds.

TEST CONDITION:

Before performing the following procedure, confirm that battery voltage is between 10 V and 16 V at idle.

GO TO 3.

PERFORM DTC CONFIRMATION PROCEDURE

1. Start the engine and warm it up until the engine coolant temperature reaches 25°C (77°F) or more.

2. Keep the engine at idle at least 35 seconds.

3. Check 1st trip DTC.

Is DTC P0053 detected?

Proceed to Diagnosis Procedure.

To check malfunction symptom before repair: Refer to Intermittent Incident.

Confirmation after repair: INSPECTION END

CHECK DTC PRIORITY

If DTC P0053 is displayed with DTC 0031, 0032 or P0130, first perform the confirmation procedure (trouble diagnosis) for DTC 0031, 0032 or P0130.

Is DTC P0031, P0032 or P0130 detected?

Perform diagnosis of applicable.

• P0130: Refer to DTC Description.

• P0031: Refer to DTC Description.

• P0032: Refer to DTC Description.

GO TO 2.

CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY

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
   F12	1	Ground	Battery voltage

Is the inspection result normal?

GO TO 4.

GO TO 3.

CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT

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?

Perform the trouble diagnosis for power supply circuit.

Repair or replace error-detected parts.

CHECK A/F SENSOR 1 HEATER OUTPUT SIGNAL CIRCUIT

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
   F12	2	F78	6	Existed

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

Is the inspection result normal?

GO TO 5.

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

CHECK A/F SENSOR 1 HEATER

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

Is the inspection result normal?

INSPECTION END

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

CHECK AIR FUEL RATIO (A/F) SENSOR 1

1. Turn ignition switch OFF.

2. Disconnect A/F sensor 1 harness connector.

3. Check resistance between A/F sensor 1 terminals as per the following.

   +	−	Resistance
   A/F sensor 1
   Terminal
   2	1	1.8 - 2.44 Ω [at 25°C (77°F)]
   	3	∞Ω (Continuity should not exist)
   	4
   1	3
   	4

Is the inspection result normal?

INSPECTION END

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