Infiniti G35 (V35) Sedan. Manual - part 500

EC-146

< COMPONENT DIAGNOSIS >

[VQ35HR]

P0014, P0024 EVT CONTROL

3.

Check resistance between exhaust valve timing control magnet retarder terminals as follows.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 2.

2.

REPLACE EXHAUST VALVE TIMING CONTROL MAGNET RETARDER

1.

Replace malfunctioning exhaust valve timing control magnet retarder.

2.

Perform 

EC-20, "EXHAUST VALVE TIMING CONTROL LEARNING : Special Repair Requirement"

.

>> INSPECTION END

Terminals

Resistance

1 and 2

9.0 - 11.0 

Ω

 [at 20

°

C (68

°

F)]

P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER

EC-147

< COMPONENT DIAGNOSIS >

[VQ35HR]

C

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E

F

G

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EC

N

P

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P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER

Description

INFOID:0000000000956534

SYSTEM DESCRIPTION

The ECM performs ON/OFF duty control of the A/F sensor 1 heater corresponding to the engine operating
condition to keep the temperature of A/F sensor 1 element at the specified range.

DTC Logic

INFOID:0000000000956535

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is between 10.5V and 16V at
idle.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start engine and let it idle for at least 10 seconds.

2.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to 

EC-147, "Diagnosis Procedure"

.

NG

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000000956536

1.

CHECK GROUND CONNECTION

1.

Turn ignition switch OFF.

2.

Check ground connection M95. Refer to Ground Inspection in 

GI-42, "Circuit Inspection"

.

Sensor

Input Signal to ECM

ECM function

Actuator

Camshaft position sensor (PHASE)
Crankshaft position sensor (POS)

Engine speed

Air fuel ratio (A/F) sensor 1 
heater control

Air fuel ratio (A/F) sensor 1 
heater

Mass air flow sensor

Amount of intake air

 DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0031

Air fuel ratio (A/F) sensor 
1 heater (bank 1) control 
circuit low

The current amperage in the A/F sensor 1 heater 
circuit is out of the normal range.
(An excessively low voltage signal is sent to ECM 
through the A/F sensor 1 heater.)

• Harness or connectors

(The A/F sensor 1 heater circuit is 
open or shorted.)

• A/F sensor 1 heater

P0032

Air fuel ratio (A/F) sensor 
1 heater (bank 1) control 
circuit high

The current amperage in the A/F sensor 1 heater 
circuit is out of the normal range.
(An excessively high voltage signal is sent to ECM 
through the A/F sensor 1 heater.)

• Harness or connectors

(The A/F sensor 1 heater circuit is 
shorted.)

• A/F sensor 1 heater

P0051

Air fuel ratio (A/F) sensor 
1 heater (bank 2) control 
circuit low

The current amperage in the A/F sensor 1 heater 
circuit is out of the normal range.
(An excessively low voltage signal is sent to ECM 
through the A/F sensor 1 heater.)

• Harness or connectors

(The A/F sensor 1 heater circuit is 
open or shorted.)

• A/F sensor 1 heater

P0052

Air fuel ratio (A/F) sensor 
1 heater (bank 2) control 
circuit high

The current amperage in the A/F sensor 1 heater 
circuit is out of the normal range.
(An excessively high voltage signal is sent to ECM 
through the A/F sensor 1 heater.)

• Harness or connectors

(The A/F sensor 1 heater circuit is 
shorted.)

• A/F sensor 1 heater

EC-148

< COMPONENT DIAGNOSIS >

[VQ35HR]

P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace ground connection.

2.

CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT

1.

Disconnect air fuel ratio (A/F) sensor 1 harness connector.

2.

Turn ignition switch ON.

3.

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

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 3.

3.

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.

4.

CHECK A/F SENSOR 1 HEATER OUTPUT 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.

4.

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

Is the inspection result normal?

YES

>> GO TO 5.

NO

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

5.

CHECK A/F SENSOR 1 HEATER

Refer to 

EC-149, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 6.

6.

REPLACE AIR FUEL RATIO (A/F) SENSOR 1

Replace malfunctioning 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.

>> INSPECTION END

DTC

A/F sensor 1

Ground

Voltage

Bank

Connector

Terminal

P0031, P0032

1

F3

4

Ground

Battery voltage

P0051, P0052

2

F20

4

DTC

A/F sensor 1

ECM

Continuity

Bank

Connector

Terminal

Connector

Terminal

P0031, P0032

1

F3

3

F101

1

Existed

P0051, P0052

2

F20

3

5

P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER

EC-149

< COMPONENT DIAGNOSIS >

[VQ35HR]

C

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G

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EC

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P

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7.

CHECK INTERMITTENT INCIDENT

Perform 

GI-39, "Intermittent Incident"

.

>> Repair or replace.

Component Inspection

INFOID:0000000000956537

1.

CHECK AIR FUEL RATIO (A/F) SENSOR 1

1.

Turn ignition switch OFF.

2.

Disconnect A/F sensor 1 harness connector.

3.

Check resistance between A/F sensor 1 terminals as follows.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 2.

2.

REPLACE AIR FUEL RATIO (A/F) SENSOR 1

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

CAUTION:

• Discard any air fuel ratio (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 air fuel ratio (A/F) sensor, clean exhaust system threads using Heated Oxygen

Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

>> INSPECTION END

Terminal

Resistance

3 and 4

1.8 - 2.44 

Ω

 [at 25

°

C (77

°

F)]

3 and 1, 2

∞

 

Ω

(Continuity should not exist)

4 and 1, 2