Infiniti M35/M45 Y50. Manual - part 604

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

EC-889

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EC

5. 

CHECK A/F SENSOR 1 HEATER

Refer to 

EC-889, "Component Inspection"

 .

OK or NG

OK

>> GO TO 6.

NG

>> GO TO 7.

6. 

CHECK INTERMITTENT INCIDENT

Perform 

EC-857, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

OK or NG

OK

>> GO TO 7.

NG

>> Repair or replace.

7. 

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.

>> INSPECTION END

Component Inspection

NBS005BN

AIR FUEL RATIO (A/F) SENSOR 1 HEATER

Check resistance between terminals 3 and 4.

Check continuity between terminals 3 and 1, 2, 5, 6, terminals 4 and
1, 2, 5, 6.

If NG, replace the 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 Heated Oxygen Sensor Thread Cleaner tool
J-43897-18 or J-43897-12 and approved anti-seize lubricant.

Removal and Installation 

NBS005BO

AIR FUEL RATIO (A/F) SENSOR 1

Refer to 

EM-183, "EXHAUST MANIFOLD AND THREE WAY CATALYST"

 .

Resistance: 2.3 - 4.3

Ω

 [at 25

°

C (77

°

F)]

Continuity should not exist.

PBIB1684E

EC-890

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DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

PFP:226A0

Description

NBS005BP

SYSTEM DESCRIPTION

The ECM performs ON/OFF control of the heated oxygen sensor 2 heater corresponding to the engine speed,
amount of intake air and engine coolant temperature. 

OPERATION

CONSULT-II Reference Value in Data Monitor Mode

NBS005BQ

Specification data are reference values.

On Board Diagnosis Logic

NBS005BR

Sensor

Input signal to ECM

ECM function

Actuator

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

Engine speed

Heated oxygen sensor 2 
heater control

Heated oxygen sensor 2 heater

Engine coolant temperature sensor

Engine coolant temperature

Mass air flow sensor

Amount of intake air

Engine speed rpm

Heated oxygen sensor 2 heater

Above 3,600

OFF

Below 3,600 rpm 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

ON

MONITOR ITEM

CONDITION

SPECIFICATION

HO2S2 HTR (B1)
HO2S2 HTR (B2)

●

Engine speed: Below 3,600 rpm 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

ON

●

Engine speed: Above 3,600 rpm

OFF

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0037
0037
(Bank 1)

Heated oxygen sensor 2 
heater control circuit low

The current amperage in the heated oxygen 
sensor 2 heater circuit is out of the normal 
range.
(An excessively low voltage signal is sent to 
ECM through the heated oxygen sensor 2 
heater.)

●

Harness or connectors
(The heated oxygen sensor 2 heater circuit 
is open or shorted.)

●

Heated oxygen sensor 2 heater

P0057
0057
(Bank 2)

P0038
0038
(Bank 1)

Heated oxygen sensor 2 
heater control circuit high

The current amperage in the heated oxygen 
sensor 2 heater circuit is out of the normal 
range.
(An excessively high voltage signal is sent 
to ECM through the heated oxygen sensor 2 
heater.)

●

Harness or connectors
(The heated oxygen sensor 2 heater circuit 
is shorted.)

●

Heated oxygen sensor 2 heater

P0058
0058
(Bank 2)

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

EC-891

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DTC Confirmation Procedure

NBS005BS

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.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is between 11V and 16V at
idle.

 WITH CONSULT-II

1.

Turn ignition switch ON and select “DATA MONITOR” mode with
CONSULT-II.

2.

Wait at least 5 seconds.

3.

If 1st trip DTC is detected, go to 

EC-895, "Diagnostic Procedure"

.

 WITH GST

Follow the procedure “WITH CONSULT-II” above.

SEF174Y

EC-892

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DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

Wiring Diagram

NBS005BT

BANK 1

TBWT1014E