Infiniti G37 Coupe. Manual - part 573

P2A00, P2A03 A/F SENSOR 1

EC-473

< COMPONENT DIAGNOSIS >

[VQ37VHR]

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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
• 15A 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 or short to ground or short to power in harness or connectors.

9.

CHECK A/F SENSOR 1 HEATER

Refer to 

EC-157, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> GO TO 11.

10.

CHECK INTERMITTENT INCIDENT

Perform 

GI-38, "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

EC-474

< COMPONENT DIAGNOSIS >

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P2A00, P2A03 A/F SENSOR 1

NO

>> Repair or replace.

11.

REPLACE AIR FUEL RATIO (A/F) SENSOR 1

Replace air fuel ratio (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 tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

Do you have CONSULT-III?

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-22, "MIXTURE RATIO SELF-LEARNING VALUE

CLEAR : Special Repair Requirement"

.

Do you have CONSULT-III?

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

ASCD BRAKE SWITCH

EC-475

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ASCD BRAKE SWITCH

Description

INFOID:0000000001911042

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 this input of two kinds (ON/OFF signal).
Refer to 

EC-62, "System Description"

 for the ASCD function.

Component Function Check

INFOID:0000000001734298

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 and ground.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-475, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000001734299

1.

INSPECTION START

Check which type of transmission the vehicle is equipped with.

Which type of transmission?

A/T

>> GO TO 2.

M/T

>> GO TO 7.

2.

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 4.

NO

>> GO TO 3.

3.

DETECT MALFUNCTIONING PART

Check the following.

Monitor item

Condition

Indication

BRAKE SW1

Brake pedal (A/T)
Brake pedal and clutch pedal (M/T)

Slightly depressed

OFF

Fully released

ON

ECM

Ground

Condition

Voltage

Connector

Terminal

M107

126

(ASCD brake switch signal)

Ground

Brake pedal (A/T)
Brake pedal and clutch pedal (M/T)

Slightly depressed

Approx. 0V

Fully released

Battery voltage

ASCD brake switch

Ground

Voltage

Connector

Terminal

E109

1

Ground

Battery voltage

EC-476

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ASCD BRAKE SWITCH

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

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

4.

CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between ASCD brake switch harness connector and ECM harness connector.

4.

Also check harness for short to ground and short to power.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 5.

5.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E106, M6
• Harness for open or short between ECM and ASCD brake switch

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

6.

CHECK ASCD BRAKE SWITCH

Refer to 

EC-478, "Component Inspection (ASCD Brake Switch)"

Is the inspection result normal?

YES

>> GO TO 15.

NO

>> Replace ASCD brake switch.

7.

CHECK ASCD BRAKE SWITCH 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 12.

NO

>> GO TO 8.

8.

CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ASCD clutch switch harness connector.

3.

Turn ignition switch ON.

4.

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

ASCD brake switch

ECM

Continuity

Connector

Terminal

Connector

Terminal

E109

2

M107

126

Existed

ASCD brake switch

Ground

Condition

Voltage

Connector

Terminal

E109

1

Ground

Brake pedal

Slightly depressed

Approx. 0V

Fully released

Battery voltage