Infiniti Q45. Manual — part 387
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
EC-187
C
D
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F
G
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A
EC
5.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors E315, F5
●
Harness for open or short between heated oxygen sensor 2 and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
6.
CHECK HEATED OXYGEN SENSOR 2 HEATER
Refer to
EC-187, "Component Inspection"
OK or NG
OK
>> GO TO 7.
NG
>> Replace malfunctioning heated oxygen sensor 2.
7.
CHECK INTERMITTENT INCIDENT
Refer to
EC-145, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
>> INSPECTION END
Component Inspection
NBS001SD
HEATED OXYGEN SENSOR 2 HEATER
1.
Check resistance between HO2S2 terminals as follows.
2.
If NG, replace heated oxygen sensor 2.
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
NBS001SE
HEATED OXYGEN SENSOR 2
Refer to
EM-23, "EXHAUST MANIFOLD AND THREE WAY CATALYST"
Terminal No.
Resistance
2 and 3
5.0 - 7.0
Ω
[at 25
°
C (77
°
F)]
1 and 2, 3, 4
∞
Ω
(Continuity should not exist)
4 and 1, 2, 3
SEF249Y
EC-188
DTC P0075, P0081 IVT CONTROL SOLENOID VALVE
DTC P0075, P0081 IVT CONTROL SOLENOID VALVE
PFP:23796
Component Description
NBS001ZC
Intake valve timing control solenoid valve is activated by ON/OFF
pulse duty (ratio) signals from the ECM.
The intake valve timing control solenoid valve changes the oil
amount and direction of flow through intake valve timing control unit
or stops oil flow.
The longer pulse width advances valve angle.
The shorter pulse width retards valve angle.
When ON and OFF pulse widths become equal, the solenoid valve
stops oil pressure flow to fix the intake valve angle at the control
position.
CONSULT-II Reference Value in Data Monitor Mode
NBS001ZD
Specification data are reference values.
On Board Diagnosis Logic
NBS001ZE
DTC Confirmation Procedure
NBS001ZF
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 more than 11V at idle.
WITH CONSULT-II
1.
Turn ignition switch ON.
2.
Select “DATA MONITOR” mode with CONSULT-II.
3.
Start engine and wait let it idle for 5 seconds.
4.
If 1st trip DTC is detected, go to
EC-193, "Diagnostic Procedure"
.
WITH GST
Following the procedure WITH CONSULT-II above.
PBIB1842E
MONITOR ITEM
CONDITION
SPECIFICATION
INT/V SOL (B1)
INT/V SOL (B2)
●
Engine: After warming up
●
Selector lever: P or N
●
Air conditioner switch: OFF
●
No load
Idle
0% - 2%
2,000 rpm
Approx. 25% - 50%
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0075
0075
(bank 1)
Intake valve timing control
solenoid valve circuit
An improper voltage is sent to the ECM
through intake valve timing control solenoid
valve.
●
Harness or connectors
(Intake valve timing control solenoid
valve circuit is open or shorted.)
●
Intake valve timing control solenoid valve.
P0081
0081
(bank 2)
SEF058Y
DTC P0075, P0081 IVT CONTROL SOLENOID VALVE
EC-189
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D
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EC
Wiring Diagram
NBS001ZG
BANK 1
TBWM1235E
EC-190
DTC P0075, P0081 IVT CONTROL SOLENOID VALVE
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II.
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.
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
10
P
Intake valve timing control
solenoid valve (bank 1)
[Engine is running]
●
Warm-up condition
●
Idle speed
BATTERY VOLTAGE
(11 - 14V)
[Engine is running]
●
Warm-up condition
●
Engine speed: 2,000rpm
7 - 12V
111
W/B
ECM relay
(Self shut-off)
[Engine is running]
[Ignition switch: OFF]
●
For a few seconds after turning ignition
switch OFF
0 - 1.5V
[Ignition switch: OFF]
●
More than a few seconds after turning igni-
tion switch OFF
BATTERY VOLTAGE
(11 - 14V)
119
120
R
R
Power supply for ECM
[Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14V)
PBIB1790E
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