Nissan Frontier D22. Manual - part 553

DTC P0034 SCB VALVE CONTROL SOLENOID VALVE

EC-1315

[VG33ER]

C

D

E

F

G

H

I

J

K

L

M

A

EC

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 the ECM terminals, such as the ground.

Diagnostic Procedure

UBS00DT1

1. 

CHECK SCB VALVE CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect SCB valve control solenoid valve harness connec-
tor.

3.

Turn ignition switch ON.

4.

Check voltage between SCB valve control solenoid valve termi-
nal 1 and ground with CONSULT-II or tester.

OK or NG

OK

>> GO TO 3.

NG

>> GO TO 2.

2. 

DETECT MALFUNCTIONING PART

Check the following.

●

Fuse block (J/B) connector E49

●

10A fuse

●

Harness for open or short between SCB valve control solenoid valve and fuse

>> Repair harness or connectors.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

 DATA (DC Voltage)

6

G/W

SCB valve control solenoid 
valve

[Ignition switch: ON]

●

Engine stopped

BATTERY VOLTAGE
(11 - 14V)

[Engine is running]

●

Idle speed

Approximately 0V

LEC806

Voltage: Battery voltage

SEF657W

EC-1316

[VG33ER]

DTC P0034 SCB VALVE CONTROL SOLENOID VALVE

3. 

CHECK SCB VALVE CONTROL SOLENOID VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND 

SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check harness continuity between ECM terminal 6 and SCB valve control solenoid valve terminal 2. Refer
to Wiring Diagram.

4.

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

OK or NG

OK

>> GO TO 5.

NG

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

4. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E43, M65

●

Harness connectors M58, F28

●

Harness for open or short between SCB valve control solenoid valve and ECM

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

5. 

CHECK SCB VALVE CONTROL SOLENOID VALVE

Refer to 

EC-1316, "Component Inspection"

 .

OK or NG

OK

>> GO TO 6.

NG

>> Replace SCB valve control solenoid valve.

6. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-1297, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END.

Component Inspection

UBS00DT2

SCB VALVE CONTROL SOLENOID VALVE

 With CONSULT-II

1.

Perform “SCB/V CONT SOL/V” in “ACTIVE TEST” mode.

Continuity should exist.

PBIB1439E

DTC P0034 SCB VALVE CONTROL SOLENOID VALVE

EC-1317

[VG33ER]

C

D

E

F

G

H

I

J

K

L

M

A

EC

2.

Check air passage continuity and operation delay time under the
following conditions.

 Without CONSULT-II

Check air passage continuity and operation delay time under the fol-
lowing conditions.

Conditions

Air passage between continuity 

between A and B

Air passage between continuity 

between A and C

ON

Yes

No

OFF

No

Yes

PBIB1434E

Conditions

Air passage between continu-

ity between A and B

Air passage between continu-

ity between A and C

12V direct current 
supply between 
terminals 1 and 2

Yes

No

No supply

No

Yes

PBIB1435E

EC-1318

[VG33ER]

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

PFP:226A0

Description

UBS00DT3

SYSTEM DESCRIPTION

The ECM performs ON/OFF control of the heated oxygen sensor 2 heaters corresponding to the engine
speed.

OPERATION

CONSULT-II Reference Value in Data Monitor Mode

UBS00DT4

Specification data are reference values.

On Board Diagnosis Logic

UBS00DT5

DTC Confirmation Procedure

UBS00DT6

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.

Sensor

Input Signal to ECM

ECM function

Actuator

Camshaft position sensor

Engine speed

Heated oxygen sensor 2 
heater control

Heated oxygen sensor 2 heaters

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 warning 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 warning 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
(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.)

●

Heater oxygen sensor 2 heater

P0057
(Bank 2)

P0038
(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.)

●

Heater oxygen sensor 2 heater

P0058
(Bank 2)