Nissan Frontier D22. Manual - part 257

 

  Index      Nissan     Nissan Frontier D22 Pickup (1998-2004 year) - Service and Repair Manual

 

Search            

 

 

 

 

 

 

 

  

 

Content   ..  255  256  257  258   ..

 

 

Nissan Frontier D22. Manual - part 257

 

 

DTC P0037, P0038 HO2S2 HEATER

EC-131

[KA24DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

DTC P0037, P0038 HO2S2 HEATER

PFP:226A0

Description

UBS00D24

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

UBS00D25

Specification data are reference values.

On Board Diagnosis Logic

UBS00D26

Sensor

Input Signal to ECM

ECM function

Actuator

Camshaft position sensor

Engine speed

Heated oxygen sensor 
2 heater control

Heated oxygen sensor 2 heater

Engine coolant temperature sensor

Engine coolant temperature sensor

Mass air flow sensor

Amount of intake air

Engine speed rpm

Heated oxygen sensor 2 heater

Above 4,000

OFF

●

Below 4,000 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)

●

Engine speed: Below 4,000 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 4,000 rpm

OFF

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0037

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.)

●

Heater oxygen sensor 2 heater

P0038

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.)

●

Heater oxygen sensor 2 heater

EC-132

[KA24DE]

DTC P0037, P0038 HO2S2 HEATER

DTC Confirmation Procedure

UBS00D27

NOTE:
If “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch OFF and wait at
least 5 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is in between 10.5V at idle.

 WITH CONSULT-II

1.

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

2.

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

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 under no load.

5.

Let engine idle for 1 minute.

6.

If 1st trip DTC is detected, go to 

EC-134, "Diagnostic Procedure"

.

 WITH GST

1.

Start 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 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 under no load.

7.

Let engine idle for 1 minute.

8.

Select “MODE 3” with GST.

9.

If DTC is detected, go to 

EC-134, "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

DTC P0037, P0038 HO2S2 HEATER

EC-133

[KA24DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

Wiring Diagram

UBS00D28

BBWA1058E

EC-134

[KA24DE]

DTC P0037, P0038 HO2S2 HEATER

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

Diagnostic Procedure

UBS00D29

1. 

CHECK POWER SUPPLY

1.

Turn ignition switch OFF.

2.

Disconnect heated oxygen sensor 2 harness connector.

3.

Turn ignition switch ON.

4.

Check voltage between terminal 2 and ground.

OK or NG

OK

>> GO TO 3.

NG

>> GO TO 2.

2. 

DETECT MALFUNCTIONING PART

Check the following.

●

Fuse block (J/B) connector M26

●

15A fuse

●

Harness for open or short between heated oxygen sensor 2 and 15A fuse

>> Repair harness or connectors. 

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

122

R/B

Heated oxygen sensor 2 
heater

[Engine is running]

●

Warm-up condition

●

Engine speed: Below 4,000 rpm after the follow-
ing conditions are met.

●

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 is above 4,000 rpm.

BATTERY VOLTAGE
(11 - 14V)

Voltage

: Battery voltage

SEF218W

 

 

 

 

 

 

 

Content   ..  255  256  257  258   ..