Infiniti FX35, FX50 (S51). Manual - part 729

 

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Infiniti FX35, FX50 (S51). Manual - part 729

 

 

P2A00, P2A03 A/F SENSOR 1

EC-457

< DTC/CIRCUIT DIAGNOSIS >

[VQ35HR]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

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?

YES

>> Go to 

EC-457, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005237068

1.

CHECK GROUND CONNECTION

1.

Turn ignition switch OFF.

2.

Check ground connection M95. Refer to Ground Inspection in 

GI-39, "Circuit Inspection"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace ground connection.

2.

RETIGHTEN AIR FUEL RATIO (A/F) SENSOR 1

Loosen and retighten the A/F sensor 1. Refer to 

EM-36, "Removal and Installation"

.

>> GO TO 3.

3.

CHECK FOR INTAKE AIR LEAK

1.

Start engine and run it at idle.

2.

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

Is intake air leak detected?

YES

>> Repair or replace malfunctioning part.

NO

>> GO TO 4.

4.

CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE

1.

Clear the mixture ratio self-learning value. Refer to 

EC-28, "MIXTURE RATIO SELF-LEARNING VALUE

CLEAR : Special Repair Requirement"

.

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?

YES

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

EC-236, "Diagnosis

Procedure"

 or 

EC-240, "Diagnosis Procedure"

.

NO

>> GO TO 5.

5.

CHECK HARNESS CONNECTOR

1.

Turn ignition switch OFF.

2.

Disconnect A/F sensor 1 harness connector.

3.

Check harness connector for water. 

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair or replace harness connector.

6.

CHECK A/F SENSOR 1 POWER SUPPLY CIRCUIT

1.

Turn ignition switch ON.

2.

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

Water should not exit.

EC-458

< DTC/CIRCUIT DIAGNOSIS >

[VQ35HR]

P2A00, P2A03 A/F SENSOR 1

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> GO TO 7.

7.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E3, F1
• IPDM E/R harness connector E7
• 15 A fuse (No. 46)
• Harness for open or short between A/F sensor 1 and fuse

>> Repair or replace harness or connectors.

8.

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 or ECM harness connector and ground.

5.

Also check harness for short to power.

Is the inspection result normal?

YES

>> GO TO 9.

NO

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

9.

CHECK A/F SENSOR 1 HEATER

Refer to 

EC-158, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> GO TO 11.

10.

CHECK INTERMITTENT INCIDENT

Perform 

GI-36, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> GO TO 11.

DTC

A/F sensor 1

Ground

Voltage

Bank

Connector

Terminal

P2A00

1

F3

4

Ground

Battery voltage

P2A03

2

F20

4

DTC

A/F sensor 1

ECM

Continuity

Bank

Connector

Terminal

Connector

Terminal

P2A00

1

F3

1

F102

57

Existed

2

61

P2A03

2

F20

1

65

2

66

DTC

A/F sensor 1

ECM

Ground

Continuity

Bank

Connector

Terminal

Connector

Terminal

P2A00

1

F3

1

F102

57

Ground

Not existed

2

61

P2A03

2

F20

1

65

2

66

P2A00, P2A03 A/F SENSOR 1

EC-459

< DTC/CIRCUIT DIAGNOSIS >

[VQ35HR]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

NO

>> Repair or replace malfunctioning part.

11.

REPLACE A/F SENSOR 1

Replace A/F sensor 1.

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).

Will CONSULT-III be used?

YES

>> GO TO 12.

NO

>> GO TO 13.

12.

CONFIRM A/F ADJUSTMENT DATA

With CONSULT-III

1.

Turn ignition switch ON.

2.

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

3.

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

Is “0.000” displayed?

YES

>> INSPECTION END

NO

>> GO TO 13.

13.

CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE

Clear the mixture ratio self-learning value. Refer to 

EC-28, "MIXTURE RATIO SELF-LEARNING VALUE

CLEAR : Special Repair Requirement"

.

Will CONSULT-III be used?

YES

>> GO TO 14.

NO

>> INSPECTION END

14.

CONFIRM A/F ADJUSTMENT DATA

With CONSULT-III

1.

Turn ignition switch ON.

2.

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

3.

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

>> INSPECTION END

EC-460

< DTC/CIRCUIT DIAGNOSIS >

[VQ35HR]

ASCD BRAKE SWITCH

ASCD BRAKE SWITCH

Description

INFOID:0000000005237069

When the brake pedal is depressed, ASCD brake switch is turned OFF and stop lamp switch is turned ON.
ECM detects the state of the brake pedal by those two types of input (ON/OFF signal).
Refer to 

EC-66, "System Description"

 for the ASCD function.

Component Function Check

INFOID:0000000005237070

1.

CHECK ASCD BRAKE SWITCH FUNCTION

 With CONSULT-III

1.

Turn ignition switch ON.

2.

Select “BRAKE SW1” in “DATA MONITOR” mode with CONSULT-III.

3.

Check “BRAKE SW1” indication under the following conditions.

 Without CONSULT-III

1.

Turn ignition switch ON.

2.

Check the voltage between ECM harness connector terminals as follows.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-460, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000005237071

1.

CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ASCD brake switch harness connector.

3.

Turn ignition switch ON.

4.

Check the voltage between ASCD brake switch harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

DETECT MALFUNCTIONING PART

Check the following.
• Fuse block (J/B) connector E103
• 10 A fuse (No. 3)
• Harness for open or short between ASCD brake switch and fuse

Monitor item

Condition

Indication

BRAKE SW1

Brake pedal

Slightly depressed

OFF

Fully released

ON

ECM

Condition

Voltage (V)

Connector

+

Terminal

Terminal

M107

126

(ASCD brake switch signal)

128

Brake pedal

Slightly depressed

Approx. 0

Fully released

Battery voltage

ASCD brake switch

Ground

Voltage

Connector

Terminal

E109

1

Ground

Battery voltage

 

 

 

 

 

 

 

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