Nissan Murano: Dtc/circuit Diagnosis / P0131 A/f Sensor 1

DTC Description

DTC DETECTION LOGIC

To judge the malfunction, the diagnosis checks that the A/F signal computed by ECM from the A/F sensor 1 signal is not inordinately low.

The A/F signal computed by ECM from the A/F sensor 1 signal is constantly approx. 0 V.

POSSIBLE CAUSE

P0131

• Harness or connectors (The A/F sensor 1 circuit is open or shorted.)

• A/F sensor 1

P0151

• Harness or connectors (The A/F sensor 1 circuit is open or shorted.)

• A/F sensor 1

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 10.5 V at idle.

GO TO 2.

CHECK A/F SENSOR 1 FUNCTION

With CONSULT

1. Start engine and warm it up to normal operating temperature.

2. Select “A/F SEN1 (B1)” or “A/F SEN1 (B2)” in “DATA MONITOR” mode with CONSULT.

3. Check “A/F SEN1 (B1)” or “A/F SEN1 (B2)” indication.

With GST

Follow the procedure “With CONSULT” above.

Is the indication constantly approx. 0 V?

Proceed to Diagnosis Procedure.

GO TO 3.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

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

2. Turn ignition switch ON.

3. Turn ignition switch OFF, wait at least 10 seconds and then restart engine.

4. Drive and accelerate Nissan Murano vehicle to more than 40 km/h (25 MPH) within 20 seconds after restarting engine.

   CAUTION:

   Always drive Nissan Murano vehicle at a safe speed.

5. Maintain the following conditions for approximately 20 consecutive seconds.

   ENG SPEED	1,000 - 3,200 rpm
   VHCL SPEED SE	More than 40 km/h (25 mph)
   B/FUEL SCHDL	1.5 - 9.0 msec
   Selector lever	Suitable position

   NOTE:

   • Keep the accelerator pedal as steady as possible during cruising.

   • If this procedure is not completed within 1 minute after restarting engine at step 1, return to step 1.

6. Check 1st trip DTC.

With GST

Follow the procedure “With CONSULT” above.

Is 1st trip DTC detected?

Proceed to Diagnosis Procedure.

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

Confirmation after repair: INSPECTION END

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 1			Ground	Voltage
   	Bank	Connector	Terminal
   P0131	1	F12	1	Ground	Battery voltage
   P0151	2	F61	1

Is the inspection result normal?

GO TO 3.

GO TO 2.

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

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
   P0131	1	F12	3	F79	66	Existed
   			4		67
   P0151	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
   P0131	1	F12	3	Ground	Not existed
   			4
   P0151	2	F61	3
   			4

   DTC	ECM		Ground	Continuity
   	Connector	Terminal
   P0131	F79	66	Ground	Not existed
   		67
   P0151		76
   		77

5. Also check harness for short to power.

Is the inspection result normal?

INSPECTION END

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