Infiniti F50. Manual - part 380

 

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Infiniti F50. Manual - part 380

 

 

DTC P0031, P0032, P0051, P0052 HO2S1 HEATER

EC-161

C

D

E

F

G

H

I

J

K

L

M

A

EC

2. 

DETECT MALFUNCTIONING PART

Check the following.

Harness connectors E32, F32

Fuse block (J/B) No.1 connector E201

10A fuse

Harness for open or short between heated oxygen sensor 1 and fuse

>> Repair harness or connectors.

3. 

CHECK HO2S1 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 HO2S1 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 4.

NG

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

4. 

CHECK HEATED OXYGEN SENSOR 1 HEATER

Refer to 

EC-162, "Component Inspection"

 .

OK or NG

OK

>> GO TO 5.

NG

>> Replace malfunctioning heated oxygen sensor 1.

5. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

DTC

Terminals

Bank

ECM

Sensor

P0031, P0032

8

2

1

P0051, P0052

9

2

2

Continuity should exist.

EC-162

DTC P0031, P0032, P0051, P0052 HO2S1 HEATER

Component Inspection

EBS00LX2

HEATED OXYGEN SENSOR 1 HEATER

1.

Check resistance between HO2S1 terminals as follows.

2.

If NG, replace heated oxygen sensor 1.

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 sur-
face 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

EBS00LX3

HEATED OXYGEN SENSOR 1

Refer to 

EM-22, "EXHAUST MANIFOLD AND THREE WAY CATALYST"

 .

Terminal No.

Resistance

2 and 3

3.3 - 4.0 

 at 25

°

C (77

°

F)

1 and 2, 3, 4

 

(Continuity should not exist)

4 and 1, 2, 3

SEF249Y

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

EC-163

C

D

E

F

G

H

I

J

K

L

M

A

EC

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

PFP:226A0

Description

EBS00LX4

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

EBS00LX5

Specification data are reference values.

On Board Diagnosis Logic

EBS00LX6

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 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: Above 3,600 rpm

OFF

Engine speed is 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

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.)

Heater 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.)

Heater oxygen sensor 2 heater

P0058
0058
(Bank 2)

EC-164

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

DTC Confirmation Procedure

EBS00LX7

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

1.

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

2.

Start the engine and warm it up to the normal operating temperature.

3.

Turn ignition switch “OFF” and wait at least 10 seconds.

4.

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

5.

Let engine idle for 1 minute.

6.

If 1st trip DTC is detected, go to 

EC-168, "Diagnostic Procedure"

.

 WITH GST

1.

Start the engine and warm it up to the normal operating temperature.

2.

Turn ignition switch “OFF” and wait at least 10 seconds.

3.

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

4.

Let engine idle for 1 minute.

5.

Turn ignition switch “OFF” and wait at least 10 seconds.

6.

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

7.

Let engine idle for 1 minute.

8.

Select “MODE 3” with GST.

9.

If DTC is detected, go to 

EC-168, "Diagnostic Procedure"

 .

When using GST, “DTC Confirmation Procedure” should be performed twice as much as when
using CONSULT-II because GST cannot display MODE 7 (1st trip DTC) concerning this diagnosis.
Therefore, using CONSULT-II is recommended.

SEF174Y

 

 

 

 

 

 

 

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