Nissan Xterra. Instruction — part 259
EC-162
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
P0037, P0038, P0057, P0058 HO2S2 HEATER
4. Turn ignition switch ON.
5. Turn ignition switch OFF and wait at least 10 seconds.
6. Start the engine and keep the engine speed between 3,500 rpm and 4,000 rpm for at least 1 minute under
no load.
7. Let engine idle for 1 minute.
8. Check 1st trip DTC.
9. If 1st trip DTC is detected, go to
WITH GST
Follow the procedure “WITH CONSULT” above.
Diagnosis Procedure
INFOID:0000000009483846
1.
CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body. Refer to
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
2.
CHECK HO2S2 POWER SUPPLY CIRCUIT
1. Disconnect heated oxygen sensor 2 harness connector.
2. Turn ignition switch ON.
BBIA0539E
BBIA0540E
P0037, P0038, P0057, P0058 HO2S2 HEATER
EC-163
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
C
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F
G
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A
EC
N
P
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3. Check voltage between HO2S2 terminal 3 and ground with CONSULT or tester.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 3.
3.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E2, F32
• IPDM E/R harness connector E119
• 15 A fuse (No.54)
• Harness for open or short between heated oxygen sensor 2 and fuse
>> Repair harness or connectors.
4.
CHECK HO2S2 OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal and HO2S2 terminal as follows.
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.
5.
CHECK HEATED OXYGEN SENSOR 2 HEATER
EC-163, "Component Inspection"
OK or NG
OK
>> GO TO 6.
NG
>> Replace malfunctioning heated oxygen sensor 2. Refer to
6.
CHECK INTERMITTENT INCIDENT
GI-40, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection
INFOID:0000000009483847
HEATED OXYGEN SENSOR 2 HEATER
1. Check resistance between HO2S2 terminals as follows.
2. If NG, replace heated oxygen sensor 2. Refer to
.
Voltage: Battery voltage
DTC
Terminals
Bank
ECM
Sensor
P0037, P0038
37
2
1
P0057, P0058
41
2
2
Continuity should exist.
Terminal No.
Resistance
2 and 3
3.4 - 4.4
Ω [at 25°C (77°F)]
1 and 2, 3, 4
∞ Ω
(Continuity should not exist)
4 and 1, 2, 3
EC-164
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
P0037, P0038, P0057, P0058 HO2S2 HEATER
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 surface 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.
P0075, P0081 IVT CONTROL SOLENOID VALVE
EC-165
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
C
D
E
F
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EC
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P
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P0075, P0081 IVT CONTROL SOLENOID VALVE
Component Description
INFOID:0000000009483848
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.
On Board Diagnosis Logic
INFOID:0000000009483849
DTC Confirmation Procedure
INFOID:0000000009483850
1. If DTC Confirmation Procedure has been previously conducted, always perform the following before con-
ducting the next step.
a. Turn ignition switch OFF and wait at least 10 seconds.
b. Turn ignition switch ON.
c. Turn ignition switch OFF and wait at least 10 seconds.
2. Start engine and let it idle for 5 seconds.
3. Check 1st trip DTC.
4. If 1st trip DTC is detected, go to
Diagnosis Procedure
INFOID:0000000009483851
1.
CHECK INTAKE VALVE TIMING CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect intake valve timing control solenoid valve harness connector.
PBIB1842E
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)
1.
Intake manifold collector
2.
Intake valve timing control solenoid
valve (Bank 1)
3.
Intake valve timing control solenoid
valve (Bank 2)
: Front
AWBIA0685ZZ
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