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
EC-1316, "Component Inspection"
OK or NG
OK
>> GO TO 6.
NG
>> Replace SCB valve control solenoid valve.
6.
CHECK INTERMITTENT INCIDENT
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)
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