Nissan Murano: Dtc/circuit Diagnosis / Trouble Diagnosis - Specification Value

Description

ECM input/output valve when the engine control system operates normally.

NOTE:

The SP value is indicated when “DISPLAY TYPE” is “Line Graph”.

START

Check that all of the following conditions are satisfied.

• Nissan Murano Vehicle driven distance: More than 5,000 km (3,107 miles)

• Barometric pressure: 98.3 - 104.3 kPa (1.003 - 1.064 kg/cm², 14.25 - 15.12 psi)

• Atmospheric temperature: 20 - 30°C (68 - 86°F)

• Engine coolant temperature: 75 - 95°C (167 - 203°F)

• Transmission: Warmed-up

  • After the engine is warmed up to normal operating temperature, drive Nissan Murano vehicle until “FLUID TEMP SE” (CVT fluid temperature sensor signal) indicates more than 60°C (140°F).

• Electrical load: Not applied

  • Rear window defogger switch, air conditioner switch lighting switch are OFF. Steering wheel is straight ahead.

• Engine speed: Idle

GO TO 2.

CHECK REFERENCE OF DATA MONITOR MODE

With CONSULT

NOTE:

Perform “Reference” in “DATA MONITOR” mode in maximum scale display.

1. Perform basic inspection. Refer to Work Procedure.

2. On CONSULT screen, select “ENGINE”>>“DATA MONITOR”.

3. Select “Reference” and change “DISPLAY TYPE” to “Line Graph”.

4. Select “B/FUEL SCHDL”, “A/F ALPHA-B1”, “A/F ALPHA-B2” and “MAS AIR FLOW SENSOR (Hz)” in “SPEC” of “DATA MONITOR” mode with CONSULT.

5. Check that monitor items are within the SP value.

Is the measurement value within the SP value?

INSPECTION END

Proceed to Diagnosis Procedure.

OVERALL SEQUENCE

DETAILED PROCEDURE

CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”

With CONSULT

1. Start engine.

2. Confirm that the testing conditions are met. Refer to Component Function Check.

3. Select “DATA MONITOR” mode of “ENGINE” using CONSULT.

4. Select “Reference” and change “DISPLAY TYPE” to “Line Graph”.

5. Select “A/F ALPHA-B1”, “A/F ALPHA-B2”.

   NOTE:

   Check “A/F ALPHA-B1”, “A/F ALPHA-B2” for approximately 1 minute because they may fluctuate. It is NG if the indication is out of the SP value even a little.

Is the measurement value within the SP value?

GO TO 17.

Less than the SP value: GO TO 2.

More than the SP value: GO TO 3.

CHECK “B/FUEL SCHDL”

Select “B/FUEL SCHDL” in “Reference” of “DATA MONITOR” mode, and check that the indication is within the SP value.

Is the measurement value within the SP value?

GO TO 4.

More than the SP value: GO TO 19.

CHECK “B/FUEL SCHDL”

Select “B/FUEL SCHDL” in “Reference” of “DATA MONITOR” mode, and check that the indication is within the SP value.

Is the measurement value within the SP value?

GO TO 6.

More than the SP value: GO TO 6.

Less than the SP value: GO TO 25.

CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”

1. Stop the engine.

2. Disconnect PCV hose, and then plug it.

3. Start engine.

4. Select “DATA MONITOR” mode of “ENGINE” using CONSULT.

5. Select “Reference” and change “DISPLAY TYPE” to “Line Graph”.

6. Select “A/F ALPHA-B1”, “A/F ALPHA-B2”.

Is the measurement value within the SP value?

GO TO 5.

GO TO 6.

CHANGE ENGINE OIL

1. Stop the engine.

2. Change engine oil.

   NOTE:

   This symptom may occur when a large amount of gasoline is mixed with engine oil because of driving conditions (such as when engine oil temperature does not rise enough since a journey distance is too short during winter). The symptom will not be detected after changing engine oil or changing driving conditions.

INSPECTION END

CHECK FUEL PRESSURE

Check fuel pressure. (Refer to Work Procedure.)

Is the inspection result normal?

GO TO 9.

Fuel pressure is too high: Replace “fuel filter and fuel pump assembly”, refer to Removal and Installation, and then GO TO 8.

Fuel pressure is too low: GO TO 7.

DETECT MALFUNCTIONING PART

Check fuel hoses and fuel tubes for clogging.

Is the inspection result normal?

Replace “fuel filter and fuel pump assembly”, refer to Removal and Installation, and then GO TO 8.

Repair or replace malfunctioning part and then GO TO 8.

CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”

1. Start engine.

2. Select “DATA MONITOR” mode of “ENGINE” using CONSULT.

3. Select “Reference” and change “DISPLAY TYPE” to “Line Graph”.

4. Select “A/F ALPHA-B1”, “A/F ALPHA-B2”.

Is the measurement value within the SP value?

INSPECTION END

GO TO 9.

PERFORM POWER BALANCE TEST

1. Perform “POWER BALANCE” in “ACTIVE TEST” mode.

2. Check that the each cylinder produces a momentary engine speed drop.

Is the inspection result normal?

GO TO 12.

GO TO 10.

DETECT MALFUNCTIONING PART

Check the following below.

• Ignition coil and its circuit (Refer to Component Function Check.)

• Fuel injector and its circuit (Refer to Component Function Check.)

• Intake air leakage

• Low compression pressure (Refer to On-Nissan Murano Vehicle Service.)

Is the inspection result normal?

Replace fuel injector, refer to Removal and Installation, and then GO TO 11.

Repair or replace malfunctioning part and then GO TO 11.

CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”

1. Start engine.

2. Select “DATA MONITOR” mode of “ENGINE” using CONSULT.

3. Select “Reference” and change “DISPLAY TYPE” to “Line Graph”.

4. Select “A/F ALPHA-B1”, “A/F ALPHA-B2”.

Is the measurement value within the SP value?

INSPECTION END

GO TO 12.

CHECK A/F SENSOR 1 FUNCTION

Perform all DTC CONFIRMATION PROCEDURE related with A/F sensor 1.

• For DTC P0130, P0150, P2237, P2238, P2239, P2240, P2241, P2242, P2251, P2252, P2253, P2254, P2255, P2256, refer to DTC Index.

• For DTC P0131, P0151, refer to DTC Index.

• For DTC P0132, P0152, refer to DTC Index.

• For DTC P014C, P014D, P014E, P014F, P015A, P015B, P015C, P015D, refer to DTC Index.

• For DTC P2096, P2097, P2098, P2099, refer to DTC Index.

Are any DTCs detected?

GO TO 15.

GO TO 13.

CHECK A/F SENSOR 1 CIRCUIT

Perform Diagnostic Procedure according to corresponding DTC.

GO TO 14.

CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”

1. Start engine.

2. Select “DATA MONITOR” mode of “ENGINE” using CONSULT.

3. Select “Reference” and change “DISPLAY TYPE” to “Line Graph”.

4. Select “A/F ALPHA-B1”, “A/F ALPHA-B2”.

Is the measurement value within the SP value?

INSPECTION END

GO TO 15.

DISCONNECT AND RECONNECT ECM HARNESS CONNECTOR

1. Stop the engine.

2. Disconnect ECM harness connector. Check pin terminal and connector for damage, and then reconnect it.

GO TO 16.

CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”

1. Start engine.

2. Select “DATA MONITOR” mode of “ENGINE” using CONSULT.

3. Select “Reference” and change “DISPLAY TYPE” to “Line Graph”.

4. Select “A/F ALPHA-B1”, “A/F ALPHA-B2”.

Is the measurement value within the SP value?

INSPECTION END

Detect malfunctioning part according to Symptom Table.

CHECK “B/FUEL SCHDL”

1. Select “DATA MONITOR” mode of “ENGINE” using CONSULT.

2. Select “Reference” and change “DISPLAY TYPE” to “Line Graph”.

3. Select “B/FUEL SCHDL”.

Is the measurement value within the SP value?

INSPECTION END

More than the SP value: GO TO 18.

Less than the SP value: GO TO 25.

DETECT MALFUNCTIONING PART

1. Check for the cause of large engine friction. Refer to the following.

   • Engine oil level is too high

   • Engine oil viscosity

   • Belt tension of power steering, generator, A/C compressor, etc. is excessive

   • Noise from engine

   • Noise from transmission, etc.

2. Check for the cause of insufficient combustion. Refer to the following.

   • Valve clearance malfunction

   • Intake valve timing control function malfunction

   • Camshaft sprocket installation malfunction, etc.

Repair or replace malfunctioning part, and then GO TO 30.

CHECK INTAKE SYSTEM

Check for the cause of uneven air flow through mass air flow sensor. Refer to the following.

• Crushed air ducts

• Malfunctioning seal of air cleaner element

• Uneven dirt of air cleaner element

• Improper specification of intake air system

Is the inspection result normal?

GO TO 21.

Repair or replace malfunctioning part, and then GO TO 20.

CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”, AND “B/FUEL SCHDL”

1. Select “DATA MONITOR” mode of “ENGINE” using CONSULT.

2. Select “Reference” and change “DISPLAY TYPE” to “Line Graph”.

3. Select “A/F ALPHA-B1”, “A/F ALPHA-B2” and “B/FUEL SCHDL”.

Is the measurement value within the SP value?

INSPECTION END

“B/FUEL SCHDL” is more, “A/F ALPHA-B1”, “A/F ALPHA-B2” are less than the SP value: GO TO 21.

DISCONNECT AND RECONNECT MASS AIR FLOW SENSOR HARNESS CONNECTOR

1. Stop the engine.

2. Disconnect mass air flow sensor harness connector. Check pin terminal and connector for damage and then reconnect it again.

GO TO 22.

CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”

1. Start engine.

2. Select “DATA MONITOR” mode of “ENGINE” using CONSULT.

3. Select “Reference” and change “DISPLAY TYPE” to “Line Graph”.

4. Select “A/F ALPHA-B1”, “A/F ALPHA-B2”.

Is the measurement value within the SP value?

Detect malfunctioning part of mass air flow sensor circuit and repair it. Refer to Diagnosis Procedure. Then GO TO 29.

GO TO 23.

CHECK “MAS AIR FLOW SENSOR (Hz)”

1. Select “DATA MONITOR” mode of “ENGINE” using CONSULT.

2. Select “Reference” and change “DISPLAY TYPE” to “Line Graph”.

3. Select “MAS AIR FLOW SENSOR (Hz)”.

Is the measurement value within the SP value?

GO TO 24.

More than the SP value: Replace mass air flow sensor, refer to Removal and Installation, and then GO TO 29.

REPLACE ECM

Replace ECM. Refer to Removal and Installation.

GO TO 29.

CHECK INTAKE SYSTEM

Check for the cause of uneven air flow through mass air flow sensor. Refer to the following.

• Crushed air ducts

• Malfunctioning seal in air cleaner element

• Uneven dirt in air cleaner element

• Improper specification in intake air system

Is the inspection result normal?

GO TO 27.

Repair or replace malfunctioning part, and then GO TO 26.

CHECK “B/FUEL SCHDL”

1. Select “DATA MONITOR” mode of “ENGINE” using CONSULT.

2. Select “Reference” and change “DISPLAY TYPE” to “Line Graph”.

3. Select “B/FUEL SCHDL”.

Is the measurement value within the SP value?

INSPECTION END

Less than the SP value: GO TO 27.

CHECK “MAS AIR FLOW SENSOR (Hz)”

1. Select “DATA MONITOR” mode of “ENGINE” using CONSULT.

2. Select “Reference” and change “DISPLAY TYPE” to “Line Graph”.

3. Select “MAS AIR FLOW SENSOR (Hz)”.

Is the measurement value within the SP value?

GO TO 28.

Less than the SP value: Replace mass air flow sensor, refer to Removal and Installation, and then GO TO 30.

CHECK INTAKE SYSTEM

Check for the cause of air leakage after the mass air flow sensor. Refer to the following.

• Disconnection, looseness, and cracks in air duct

• Looseness of oil filler cap

• Disconnection of oil level gauge

• Open stuck, breakage, hose disconnection, or cracks in PCV valve

• Disconnection or cracks in EVAP purge hose, stuck open EVAP canister purge volume control solenoid valve

• Malfunctioning seal in rocker cover gasket

• Disconnection, looseness, or cracks in hoses, such as a vacuum hose, connecting to intake air system parts

• Malfunctioning seal in intake air system, etc.

GO TO 30.

CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”, AND “B/FUEL SCHDL”

1. Select “DATA MONITOR” mode of “ENGINE” using CONSULT.

2. Select “Reference” and change “DISPLAY TYPE” to “Line Graph”.

3. Select “A/F ALPHA-B1”, “A/F ALPHA-B2” and “B/FUEL SCHDL”.

Is the measurement value within the SP value?

INSPECTION END

Detect malfunctioning part according to Symptom Table.

CHECK “B/FUEL SCHDL”

1. Select “DATA MONITOR” mode of “ENGINE” using CONSULT.

2. Select “Reference” and change “DISPLAY TYPE” to “Line Graph”.

3. Select “B/FUEL SCHDL”.

Is the measurement value within the SP value?

INSPECTION END

Detect malfunctioning part according to Symptom Table.