Nissan Frontier D22. Manual - part 550

POWER SUPPLY CIRCUIT FOR ECM

EC-1303

[VG33ER]

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13. 

CHECK ECM RELAY

1.

Apply 12V direct current between relay terminals 1 and 2.

2.

Check continuity between relay terminals 3 and 5.

OK or NG

OK

>> GO TO 14.

NG

>> Replace ECM relay.

14. 

CHECK ECM GROUND CIRCUIT-II FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check harness continuity between ECM terminals 10, 19, 25, 32, 116, 124 and engine ground.
Refer to Wiring Diagram.

4.

Also check harness for short to power.

OK or NG

OK

>> GO TO 15.

NG

>> GO TO 5.

15. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-1297, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END.

12V (1 - 2) applied

: Continuity exists.

No voltage applied

: No continuity

SEF090M

Continuity should exist.

EC-1304

[VG33ER]

DTC P0031, P0032, P0051, P0052 HO2S1 HEATER

DTC P0031, P0032, P0051, P0052 HO2S1 HEATER

PFP:22690

Description

UBS00DSO

SYSTEM DESCRIPTION

The ECM performs ON/OFF control of the heated oxygen sensor 1 heaters corresponding to the engine
speed.

OPERATION

CONSULT-II Reference Value in Data Monitor Mode

UBS00DSP

Specification data are reference values.

On Board Diagnosis Logic

UBS00DSQ

DTC Confirmation Procedure

UBS00DSR

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 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 engine and run it for at least 6 seconds at idle speed.

3.

If 1st trip DTC is detected, go to 

EC-1309, "Diagnostic Proce-

dure"

Sensor

Input Signal to ECM

ECM function

Actuator

Camshaft position sensor

Engine speed

Heated oxygen sensor 1 
heater control

Heated oxygen sensor 1 heaters

Engine speed

rpm

Heated oxygen sensor 1 heaters

Above 2,800

OFF

Below 2,800

ON

MONITOR ITEM

CONDITION

SPECIFICATION

HO2S1 HTR (B1)
HO2S1 HTR (B2)

●

Engine speed: Below 2,800 rpm

ON

●

Engine speed: Above 2,800 rpm

OFF

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

P0031
(Bank 1)

Heated oxygen 
sensor 1 heater 
control circuit low

The current amperage in the heated oxygen 
sensor 1 heater circuit is out of the normal 
range.
(An excessively low voltage signal is sent to 
ECM through the heated oxygen sensor 1 
heater.)

●

Harness or connectors
(The heated oxygen sensor 1 heater circuit is 
open or shorted.)

●

Heater oxygen sensor 1 heater

P0051
(Bank 2)

P0032
(Bank 1)

Heated oxygen 
sensor 1 heater 
control circuit high

The current amperage in the heated oxygen 
sensor 1 heater circuit is out of the normal 
range.
(An excessively high voltage signal is sent to 
ECM through the heated oxygen sensor 1 
heater.)

●

Harness or connectors
(The heated oxygen sensor 1 heater circuit is 
shorted.)

●

Heater oxygen sensor 1 heater

P0052
(Bank 2)

SEF058Y

DTC P0031, P0032, P0051, P0052 HO2S1 HEATER

EC-1305

[VG33ER]

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 WITH GST

1.

Start engine and run it for at least 6 seconds at idle speed.

2.

Turn ignition switch OFF, wait at least 5 seconds and then turn ON.

3.

Start engine and run it for at 6 seconds at idle speed.

4.

Select MODE 3 with GST.

5.

If DTC is detected, go to 

EC-1309, "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. There-
fore, using CONSULT-II is recommended.

EC-1306

[VG33ER]

DTC P0031, P0032, P0051, P0052 HO2S1 HEATER

Wiring Diagram

UBS00DSS

BANK 1

BBWA1077E