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Infiniti G35 (V35). Manual - part 325

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

EC-181

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

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

Turn ignition switch ON.

Check voltage between A/F sensor 1 terminal 3 and ground with
CONSULT-II or tester.

OK or NG

>> GO TO 4.

>> GO TO 3.

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors M72, F102

●

Harness connectors E108, M15

●

IPDM E/R harness connector E7

●

15A fuse

●

Harness for open or short between A/F sensor 1 and fuse

>> Repair or replace harness or connectors.

CHECK A/F SENSOR 1 HEATER OUTPUT SIGNAL CIRCUIT

Turn ignition switch OFF.

Disconnect ECM harness connector.

Check harness continuity between ECM terminal 2 (bank 1) or 24 (bank 2) and A/F sensor 1 terminal 4.
Refer to Wiring Diagram.

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

OK or NG

>> GO TO 5.

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

Voltage: Battery voltage

PBIB2100E

PBIB1683E

Continuity should exist.

EC-182

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

CHECK A/F SENSOR 1 HEATER

Refer to

EC-182, "Component Inspection"

OK or NG

>> GO TO 6.

>> GO TO 7.

CHECK INTERMITTENT INCIDENT

Perform

EC-151, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

OK or NG

>> GO TO 7.

>> Repair or replace.

REPLACE AIR FUEL RATIO (A/F) SENSOR 1

Replace malfunctioning 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

NBS000V9

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

NBS000VA

AIR FUEL RATIO (A/F) SENSOR 1

Refer to

EM-25, "EXHAUST MANIFOLD AND THREE WAY CATALYST"

Resistance: 2.3 - 4.3

Ω

[at 25

C (77

F)]

Continuity should not exist.

PBIB1684E

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

EC-183

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

PFP:226A0

Description

NBS000OG

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

NBS000OH

Specification data are reference values.

On Board Diagnosis Logic

NBS000OI

Sensor

Input signal to ECM

ECM function

Actuator

Camshaft position sensor (PHASE)

Engine speed

Heated oxygen sensor 2
heater control

Heated oxygen sensor 2 heater

Crankshaft position sensor (POS)

Engine coolant temperature sensor

Engine coolant tempera-
ture

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

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

●

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 sen-
sor 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 sen-
sor 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)

EC-184

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

DTC Confirmation Procedure

NBS000OJ

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 10.5V and 16V at
idle.

WITH CONSULT-II

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

Start engine and warm it up to the normal operating tempera-
ture.

Turn ignition switch OFF and wait at least 10 seconds.

Start the engine and keep the engine speed between 3,500 rpm
and 4,000 rpm for at least 1 minute under no load.

Let engine idle for 1 minute.

If 1st trip DTC is detected, go to

EC-188, "Diagnostic Procedure"

WITH GST

Follow the procedure “WITH CONSULT-II” above.

SEF174Y

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