Nissan Murano: Dtc/circuit Diagnosis / P2096 A/f Sensor 1

DTC Description

DTC DETECTION LOGIC

POSSIBLE CAUSE

DTC P2096

• A/F sensor 1 (bank 1)

• A/F sensor 1 heater

• Heated oxygen sensor 2 (bank 1)

• Fuel pressure

• Fuel injector

• Intake air leaks

• Exhaust gas leaks

DTC P2097

• A/F sensor 1 (bank 1)

• A/F sensor 1 heater

• Heated oxygen sensor 2 (bank 1)

• Fuel pressure

• Fuel injector

• Intake air leaks

• Exhaust gas leaks

DTC P2098

• A/F sensor 1 (bank 2)

• A/F sensor 1 heater

• Heated oxygen sensor 2 (bank 2)

• Fuel pressure

• Fuel injector

• Intake air leaks

• Exhaust gas leaks

DTC P2099

• A/F sensor 1 (bank 2)

• A/F sensor 1 heater

• Heated oxygen sensor 2 (bank 2)

• Fuel pressure

• Fuel injector

• Intake air leaks

• Exhaust gas leaks

FAIL-SAFE

Not applicable

PRECONDITIONING

If 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.

TESTING CONDITION:

Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.

GO TO 2.

PERFORM DTC CONFIRMATION PROCEDURE

1. Clear the mixture ratio self-learning value. Refer to Description.

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

3. Turn ignition switch ON.

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

5. Start engine and keep the engine speed between 3,500 and 4,000 rpm for 1 minute under no load.

6. Let engine idle for 1 minute.

7. Keep engine speed between 2,500 and 3,000 rpm for 20 minutes.

8. Check 1st trip DTC.

Is 1st trip DTC detected?

Proceed to Diagnosis Procedure.

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

Confirmation after repair: INSPECTION END

RETIGHTEN A/F SENSOR 1 AND HEATED OXYGEN SENSOR 2

Loosen and retighten the A/F sensor 1 and heated oxygen sensor 2. Refer to Removal and Installation (bank 2), Removal and Installation (bank 1).

GO TO 2.

CHECK FOR EXHAUST GAS LEAK

1. Start engine and run it at idle.

2. Listen for an exhaust gas leak before the three way catalyst 2.

Is exhaust gas leak detected?

Repair or replace.

GO TO 3.

CHECK FOR INTAKE AIR LEAKAGE

1. Start engine and run it at idle.

2. Listen for an intake air leakage after the mass air flow sensor.

Is intake air leakage detected?

Repair or replace malfunctioning part.

GO TO 4.

CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE

1. Clear the mixture ratio self-learning value. Refer to Description.

2. Run engine for at least 10 minutes at idle speed.

Is the 1st trip DTC P0171, P0172, P0174 or P0175 detected? Is it difficult to start engine?

Perform trouble diagnosis for DTC P0171, P0174 or P0172, P0175. Refer to DTC Description or DTC Description.

GO TO 5.

CHECK HARNESS CONNECTOR

1. Turn ignition switch OFF.

2. Disconnect A/F sensor 1 harness connector.

3. Check harness connector for water.

   Water should not exit.

Is the inspection result normal?

GO TO 6.

Repair or replace harness connector.

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

1. Disconnect A/F sensor 1 harness connector.

2. Turn ignition switch ON.

3. Check the voltage between A/F sensor 1 harness connector and ground.

   DTC	A/F sensor			Ground	Voltage (V)
   	Bank	Connector	Terminal
   P2096 P2097	1	F12	1	Ground	Battery voltage
   P2098 P2099	2	F61	1

Is the inspection result normal?

GO TO 8.

GO TO 7.

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 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check the continuity between A/F sensor 1 harness connector and ECM harness connector.

   DTC	A/F sensor 1			ECM		Continuity
   	Bank	Connector	Terminal	Connector	Terminal
   P2096 P2097	1	F12	3	F79	66	Existed
   			4		67
   P2098 P2099	2	F61	3		76
   			4		77

4. Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector and ground.

   DTC	A/F sensor 1			Ground	Continuity
   	Bank	Connector	Terminal
   P2096 P2097	1	F12	3	Ground	Not existed
   			4
   P2098 P2099	2	F61	3
   			4

   DTC	ECM		Ground	Continuity
   	Connector	Terminal
   P2096 P2097	F79	66	Ground	Not existed
   		67
   P2098 P2099		76
   		77

5. Also check harness for short to power.

Is the inspection result normal?

GO TO 9.

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?

GO TO 10.

GO TO 12.

CHECK HEATED OXYGEN SENSOR 2

Check heated oxygen sensor 2. Refer to Component Inspection.

Is the inspection result normal?

INSPECTION END

Replace malfunctioning heated oxygen sensor 2.

REPLACE AIR FUEL RATIO (A/F) SENSOR 1

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

Do you have CONSULT?

GO TO 12.

GO TO 13.

CONFIRM A/F ADJUSTMENT DATA

With CONSULT

1. Turn ignition switch ON.

2. Select “A/F ADJ-B1” and “A/F ADJ-B2” in “DATA MONITOR” mode with CONSULT.

3. Make sure that “0.000” is displayed on CONSULT screen.

Is “0.000” displayed?

INSPECTION END

GO TO 13.

CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE

Clear the mixture ratio self-learning value. Refer to Description.

Do you have CONSULT?

GO TO 14.

INSPECTION END

CONFIRM A/F ADJUSTMENT DATA

With CONSULT

1. Turn ignition switch ON.

2. Select “A/F ADJ-B1” and “A/F ADJ-B2” in “DATA MONITOR” mode with CONSULT.

3. Make sure that “0.000” is displayed on CONSULT screen.

INSPECTION END