Content .. 183 184 185 186 ..

Nissan Juke (2016 year). Service Repair Manual - part 185

P014C, P014D, P015A, P015B A/F SENSOR 1

EC-295

< DTC/CIRCUIT DIAGNOSIS >

[MR FOR NISMO RS MODELS]

>> GO TO 7.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors E8, F1

• IPDM E/R harness connector E14

• 20 A fuse (No. 43)

• Harness for open or short between A/F sensor 1 and fuse

>> Repair or replace harness or connectors.

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.

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

and ground.

5. Also check harness for short to power.
Is the inspection result normal?

YES

>> GO TO 9.

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

CHECK AIR FUEL RATIO (A/F) SENSOR 1 HEATER

Refer to

EC-204, "Component Inspection"

Is the inspection result normal?

YES

>> GO TO 10.

>> GO TO 13.

10.

CHECK MASS AIR FLOW SENSOR

Check mass air flow sensor.

Refer to

EC-235, "Component Inspection"

Is the inspection result normal?

YES

>> GO TO 11.

>> Replace malfunctioning mass air flow sensor. Refer to

EM-27, "Exploded View"

11.

CHECK PCV VALVE

Refer to

EM-60, "Exploded View"

Is the inspection result normal?

A/F sensor 1

ECM

Continuity

Connector

Terminal

Connector

Terminal

F70

F25

Existed

A/F sensor 1

Ground

Continuity

Connector

Terminal

F70

Ground

Not existed

ECM

Ground

Continuity

Connector

Terminal

F25

Ground

Not existed

Revision: November 2015

2016 JUKE

EC-296

< DTC/CIRCUIT DIAGNOSIS >

[MR FOR NISMO RS MODELS]

P014C, P014D, P015A, P015B A/F SENSOR 1

YES

>> GO TO 12.

>> Repair or replace PCV valve.

12.

CHECK INTERMITTENT INCIDENT

Perform

GI-45, "Intermittent Incident"

Is the inspection result normal?

YES

>> GO TO 13.

>> Repair or replace.

13.

REPLACE AIR FUEL RATIO (A/F) SENSOR 1

Replace malfunctioning air fuel ratio (A/F) sensor 1. Refer to

EM-34, "2WD : Exploded View"

(FOR 2WD MOD-

ELS),

EM-37, "AWD : Exploded View"

(FOR AWD MODELS).

CAUTION:

• Discard any A/F sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a

hard surface such as a concrete floor; use a new one.

• Before installing new A/F sensor, clean exhaust system threads using Oxygen Sensor Thread

Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved Anti-seize Lubricant

(commercial service tool).

>> INSPECTION END

Revision: November 2015

2016 JUKE

P0171 FUEL INJECTION SYSTEM FUNCTION

EC-297

< DTC/CIRCUIT DIAGNOSIS >

[MR FOR NISMO RS MODELS]

P0171 FUEL INJECTION SYSTEM FUNCTION

DTC Logic

INFOID:0000000012197846

DTC DETECTION LOGIC

With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the

theoretical mixture ratio based on the mixture ratio feedback signal from the A/F sensors 1. The ECM calcu-

lates the necessary compensation to correct the offset between the actual and the theoretical ratios.

In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the

ECM judges the condition as the fuel injection system malfunction and lights up the MIL (2 trip detection logic).

DTC CONFIRMATION PROCEDURE

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure

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.

>> GO TO 2.

PERFORM DTC CONFIRMATION PROCEDURE-I

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

EC-165, "Description"

2. Start engine.
Is it difficult to start engine?

YES

>> GO TO 3.

>> GO TO 4.

RESTART ENGINE

If it is difficult to start engine, the fuel injection system has a malfunction, too.

Crank engine while depressing accelerator pedal.

NOTE:

When depressing accelerator pedal three-fourths (3/4) or more, the control system does not start the

engine. Do not depress accelerator pedal too much.

Does engine start?

YES

>> Proceed to

EC-298, "Diagnosis Procedure"

>> Check exhaust and intake air leak visually.

PERFORM DTC CONFIRMATION PROCEDURE-II

1. Start engine and let it idle for at least 5 minutes.

2. Check 1st trip DTC.

Sensor

Input signal to ECM

ECM function

Actuator

A/F sensor 1

Density of oxygen in exhaust gas
(Mixture ratio feedback signal)

Fuel injection control

Fuel injector

DTC No.

Trouble diagnosis name

(Trouble diagnosis con-

tent)

DTC detecting condition

Possible cause

P0171

FUEL SYS-LEAN-B1
(Fuel injection system too
lean)

• Fuel injection system does not operate properly.
• The amount of mixture ratio compensation is too

large. (The mixture ratio is too lean.)

• Intake air leaks
• A/F sensor 1
• Fuel injector
• Exhaust gas leaks
• Incorrect fuel pressure
• Lack of fuel
• Mass air flow sensor
• Incorrect PCV hose connection

Revision: November 2015

2016 JUKE

EC-298

< DTC/CIRCUIT DIAGNOSIS >

[MR FOR NISMO RS MODELS]

P0171 FUEL INJECTION SYSTEM FUNCTION

Is 1st trip DTC detected?

YES

>> Proceed to

EC-298, "Diagnosis Procedure"

>> GO TO 5.

PERFORM DTC CONFIRMATION PROCEDURE-III

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

2. Start engine.

3. Maintain the following conditions for at least 10 consecutive minutes.

Hold the accelerator pedal as steady as possible.

CAUTION:

Always drive vehicle at a safe speed.

4. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Proceed to

EC-298, "Diagnosis Procedure"

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000012197847

CHECK EXHAUST GAS LEAK

1. Start engine and run it at idle.

2. Listen for an exhaust gas leak before three way catalyst (manifold).

Is exhaust gas leak detected?

YES

>> Repair or replace error-detected parts.

>> GO TO 2.

CHECK FOR INTAKE AIR LEAK

1. Listen for an intake air leak after the mass air flow sensor.

2. Check PCV hose connection.
Intake air leak detected?

YES

>> Repair or replace error-detected parts.

>> GO TO 3.

CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect corresponding A/F sensor 1 harness connector.

3. Disconnect ECM harness connector.

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

VHCL SPEED SE

50 - 120 km/h (31 - 75 MPH)

PBIB1216E

−

Continuity

A/F sensor 1

ECM

Connector

Terminal

Connector

Terminal

F70

F25

Existed

Revision: November 2015

2016 JUKE

P0171 FUEL INJECTION SYSTEM FUNCTION

EC-299

< DTC/CIRCUIT DIAGNOSIS >

[MR FOR NISMO RS MODELS]

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

and ground.

6. Also check harness for short to power.
Is the inspection result normal?

YES

>> GO TO 4.

>> Repair or replace error-detected parts.

CHECK FUEL PRESSURE

Check fuel pressure. Refer to

EC-166, "Work Procedure"

Is the inspection result normal?

YES

>> GO TO 6.

>> GO TO 5.

DETECT MALFUNCTIONING PART

Check fuel hoses and fuel tubes for clogging. Refer to

EM-54, "Exploded View"

Is the inspection result normal?

YES

>> Replace “fuel filter and fuel pump assembly”. Refer to

FL-6, "2WD : Exploded View"

(2WD) or

FL-

10, "AWD : Exploded View"

(AWD).

>> Repair or replace error-detected parts.

CHECK MASS AIR FLOW SENSOR

With CONSULT

1. Install all removed parts.

2. Check “MASS AIR FLOW” in “DATA MONITOR” mode of “ENGINE” using CONSULT.

3. For specification, refer to

EC-591, "Mass Air Flow Sensor"

With GST

1. Install all removed parts.

2. Check mass air flow sensor signal in Service $01 with GST.

3. For specification, refer to

EC-591, "Mass Air Flow Sensor"

Is the measurement value within the specification?

YES

>> GO TO 7.

>> Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or

grounds. Refer to

EC-238, "DTC Logic"

CHECK FUNCTION OF FUEL INJECTOR

With CONSULT

1. Start engine.

2. Perform “POWER BALANCE” in “ACTIVE TEST” mode of “ENGINE” using CONSULT.

3. Make sure that each circuit produces a momentary engine speed drop.

Without CONSULT

1. Let engine idle.

−

Continuity

A/F sensor 1

Connector

Terminal

F70

Ground

Not existed

−

Continuity

ECM

Connector

Terminal

F25

Ground

Not existed

Revision: November 2015

2016 JUKE

EC-300

< DTC/CIRCUIT DIAGNOSIS >

[MR FOR NISMO RS MODELS]

P0171 FUEL INJECTION SYSTEM FUNCTION

2. Listen to each fuel injector operating sound.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to

GI-45, "Intermittent

Incident"

>> Perform trouble diagnosis for “FUEL INJECTOR”, refer

EC-541, "Component Function Check"

Clicking noise should be heard.

PBIB3332E

Revision: November 2015

2016 JUKE

P0172 FUEL INJECTION SYSTEM FUNCTION

EC-301

< DTC/CIRCUIT DIAGNOSIS >

[MR FOR NISMO RS MODELS]

P0172 FUEL INJECTION SYSTEM FUNCTION

DTC Logic

INFOID:0000000012197848

DTC DETECTION LOGIC

With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the

theoretical mixture ratio based on the mixture ratio feedback signal from the A/F sensors 1. The ECM calcu-

lates the necessary compensation to correct the offset between the actual and the theoretical ratios.

In case the amount of the compensation value is extremely large (The actual mixture ratio is too rich.), the

ECM judges the condition as the fuel injection system malfunction and lights up the MIL (2 trip detection logic).

DTC CONFIRMATION PROCEDURE

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure

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.

>> GO TO 2.

PERFORM DTC CONFIRMATION PROCEDURE-I

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

EC-165, "Description"

2. Start engine.
Is it difficult to start engine?

YES

>> GO TO 3.

>> GO TO 4.

RESTART ENGINE

If it is difficult to start engine, the fuel injection system has a malfunction, too.

Crank engine while depressing accelerator pedal.

NOTE:

When depressing accelerator pedal three-fourths (3/4) or more, the control system does not start the

engine. Do not depress accelerator pedal too much.

Does engine start?

YES

>> Proceed to

EC-302, "Diagnosis Procedure"

>> Check exhaust and intake air leak visually.

PERFORM DTC CONFIRMATION PROCEDURE-II

1. Start engine and let it idle for at least 5 minutes.

2. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Proceed to

EC-302, "Diagnosis Procedure"

>> GO TO 5.

Sensor

Input signal to ECM

ECM function

Actuator

A/F sensor 1

Density of oxygen in exhaust gas
(Mixture ratio feedback signal)

Fuel injection control

Fuel injector

DTC No.

Trouble diagnosis name

(Trouble diagnosis con-

tent)

DTC detecting condition

Possible cause

P0172

FUEL SYS-RICH-B1
(Fuel injection system too
rich)

• Fuel injection system does not operate properly.
• The amount of mixture ratio compensation is too

large. (The mixture ratio is too rich.)

• A/F sensor 1
• Fuel injector
• Exhaust gas leaks
• Incorrect fuel pressure
• Mass air flow sensor

Revision: November 2015

2016 JUKE

EC-302

< DTC/CIRCUIT DIAGNOSIS >

[MR FOR NISMO RS MODELS]

P0172 FUEL INJECTION SYSTEM FUNCTION

PERFORM DTC CONFIRMATION PROCEDURE-III

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

2. Start engine.

3. Maintain the following conditions for at least 10 consecutive minutes.

Hold the accelerator pedal as steady as possible.

CAUTION:

Always drive vehicle at a safe speed.

4. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Proceed to

EC-302, "Diagnosis Procedure"

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000012197849

CHECK EXHAUST GAS LEAK

1. Start engine and run it at idle.

2. Listen for an exhaust gas leak before three way catalyst (manifold).

Is exhaust gas leak detected?

YES

>> Repair or replace error-detected parts.

>> GO TO 2.

CHECK FOR INTAKE AIR LEAK

1. Listen for an intake air leak after the mass air flow sensor.

2. Check PCV hose connection.
Intake air leak detected?

YES

>> Repair or replace error-detected parts.

>> GO TO 3.

CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect corresponding A/F sensor 1 harness connector.

3. Disconnect ECM harness connector.

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

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

and ground.

VHCL SPEED SE

50 - 120 km/h (31 - 75 MPH)

PBIB1216E

−

Continuity

A/F sensor 1

ECM

Connector

Terminal

Connector

Terminal

F70

F25

Existed

Revision: November 2015

2016 JUKE

Content .. 183 184 185 186 ..