Infiniti FX35 / FX45. Manual - part 351

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

EC-165

< SERVICE INFORMATION >

[VQ35DE]

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Diagnosis Procedure

INFOID:0000000001325978

1.

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

Loosen and retighten ground screw on the body. Refer to 

EC-144, "Ground Inspection"

.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

2.

CHECK HO2S2 POWER SUPPLY CIRCUIT

1.

Disconnect heated oxygen sensor 2 harness connector.

2.

Turn ignition switch ON.

TER-

MI-

NAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

6

R

Heated oxygen sensor 2 
heater (bank 2)

[Engine is running]
• Engine speed: Below 3,600 rpm after the fol-

lowing conditions are met.

- Engine: After warming up
- Keeping the engine speed between 3,500 

and 4,000 rpm for 1 minute and at idle for 1 
minute under no load

0 - 1.0V

[Ignition switch: ON]
• Engine stopped
[Engine is running]
• Engine speed: Above 3,600 rpm

BATTERY VOLTAGE
(11 - 14V)

55

W/R

Heated oxygen sensor 2 
(bank 2)

[Engine is running]
• Revving engine from idle to 3,000 rpm quick-

ly after the following conditions are met

- Engine: After warming up
- Keeping the engine speed between 3,500 

and 4,000 rpm for 1 minute and at idle for 1 
minute under no load

0 - Approximately 1.0V

78

B/R

Sensor ground
(Heated oxygen sensor)

[Engine is running]
• Warm-up condition
• Idle speed

Approximately 0V

PBIB2625E

PBIB1576E

EC-166

< SERVICE INFORMATION >

[VQ35DE]

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

3.

Check voltage between HO2S2 terminal 2 and ground with
CONSULT-III or tester.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 3.

3.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E64, F65
• IPDM E/R harness connector E7
• 10A fuse
• Harness for open or short between heated oxygen sensor 2 and fuse

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

4.

CHECK HO2S2 HEATER OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check harness continuity between ECM terminal and HO2S2 terminal as follows.
Refer to Wiring Diagram.

4.

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

OK or NG

OK

>> GO TO 5.

NG

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

5.

CHECK HEATED OXYGEN SENSOR 2 HEATER

Refer to 

EC-166, "Component Inspection"

.

OK or NG

OK

>> GO TO 6.

NG

>> Replace malfunctioning heated oxygen sensor 2.

6.

CHECK INTERMITTENT INCIDENT

Refer to 

EC-139

.

>> INSPECTION END

Component Inspection

INFOID:0000000001325979

HEATED OXYGEN SENSOR 2 HEATER

Voltage: Battery voltage

PBIA9576J

DTC

Terminals

Bank

ECM

Sensor

P0037, P0038

25

3

1

P0057, P0058

6

3

2

Continuity should exist.

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

EC-167

< SERVICE INFORMATION >

[VQ35DE]

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1.

Check resistance between HO2S2 terminals as follows.

2.

If NG, replace heated oxygen sensor 2.

CAUTION:

• Discard any heated oxygen 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 oxygen sensor, clean exhaust system

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

Removal and Installation

INFOID:0000000001325980

HEATED OXYGEN SENSOR 2

Refer to 

EM-26

.

Terminal No.

Resistance

2 and 3

3.4 - 4.4 

Ω

 [at 25

°

C (77

°

F)]

1 and 2, 3, 4

∞

 

Ω

(Continuity should not exist)

4 and 1, 2, 3

PBIB3344E

EC-168

< SERVICE INFORMATION >

[VQ35DE]

DTC P0075, P0081 IVT CONTROL SOLENOID VALVE

DTC P0075, P0081 IVT CONTROL SOLENOID VALVE

Component Description

INFOID:0000000001325981

Intake valve timing control solenoid valve is activated by ON/OFF
pulse duty (ratio) signals from the ECM.
The intake valve timing control solenoid valve changes the oil
amount and direction of flow through intake valve timing control unit
or stops oil flow.
The longer pulse width advances valve angle.
The shorter pulse width retards valve angle.
When ON and OFF pulse widths become equal, the solenoid valve
stops oil pressure flow to fix the intake valve angle at the control
position.

CONSULT-III Reference Value in Data Monitor Mode

INFOID:0000000001325982

Specification data are reference values.

On Board Diagnosis Logic

INFOID:0000000001325983

DTC Confirmation Procedure

INFOID:0000000001325984

NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.
1.

Start engine and let it idle for 5 seconds.

2.

Check 1st trip DTC.

3.

If 1st trip DTC is detected, go to 

EC-172, "Diagnosis Procedure"

.

PBIB1842E

MONITOR ITEM

CONDITION

SPECIFICATION

INT/V SOL(B1)
INT/V SOL(B2)

• Engine: After warming up
• Selector lever: P or N
• Air conditioner switch: OFF
• No  load

Idle

0% - 2%

When revving engine up to 2,000 rpm 
quickly

Approx. 0% - 50%

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0075
0075
(Bank 1)

Intake valve timing control 
solenoid valve circuit

An improper voltage is sent to the ECM 
through intake valve timing control solenoid 
valve.

• Harness or connectors

(Intake valve timing control solenoid valve 
circuit is open or shorted.)

• Intake valve timing control solenoid valve

P0081
0081
(Bank 2)