Nissan Pathfinder (2008 year). Manual — part 249
P0075, P0081 IVT CONTROL SOLENOID VALVE
EC-109
< COMPONENT DIAGNOSIS >
[VQ40DE]
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P0075, P0081 IVT CONTROL SOLENOID VALVE
Component Description
INFOID:0000000001370670
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:0000000001370672
DTC Confirmation Procedure
INFOID:0000000001370673
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:0000000001370675
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.
3.
Turn ignition switch ON.
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)
BBIA0553E
EC-110
< COMPONENT DIAGNOSIS >
[VQ40DE]
P0075, P0081 IVT CONTROL SOLENOID VALVE
4.
Check voltage between intake valve timing control solenoid
valve terminal 2 and ground with CONSULT-III or tester.
OK or NG
OK
>> GO TO 3.
NG
>> GO TO 2.
2.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E2, F32
• Harness connectors F26, F125 (bank 1)
• Harness for open or short between intake valve timing control solenoid valve and IPDM E/R
• Harness for open or short between intake valve timing control solenoid valve and ECM
>> Repair harness or connectors.
3.
CHECK INTAKE VALVE TIMING 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 11 (bank 1) or 10 (bank 2) and intake valve timing con-
trol solenoid valve terminal 1. Refer to Wiring Diagram.
4.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 4.
4.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors F26, F125 (bank 1)
• Harness for open and short between ECM and intake valve timing control solenoid valve
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.
CHECK INTAKE VALVE TIMING CONTROL SOLENOID VALVE
EC-110, "Component Inspection"
.
OK or NG
OK
>> GO TO 6.
NG
>> Replace malfunctioning intake valve timing control solenoid valve.
6.
CHECK INTERMITTENT INCIDENT
.
>> INSPECTION END
Component Inspection
INFOID:0000000001370676
INTAKE VALVE TIMING CONTROL SOLENOID VALVE
1.
Disconnect intake valve timing control solenoid valve harness connector.
Voltage: Battery voltage
PBIB0192E
Continuity should exist.
P0075, P0081 IVT CONTROL SOLENOID VALVE
EC-111
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2.
Check resistance between intake valve timing control solenoid
valve as follows.
If NG, replace intake valve timing control solenoid valve.
If OK, go to next step.
3.
Remove intake valve timing control solenoid valve.
4.
Provide 12V DC between intake valve timing control solenoid
valve terminals and then interrupt it. Make sure that the plunger
moves as shown in the figure.
CAUTION:
Do not apply 12V DC continuously for 5 seconds or more.
Doing so may result in damage to the coil in intake valve
timing control solenoid valve.
If NG, replace intake valve timing control solenoid valve.
NOTE:
Always replace O-ring when intake valve timing control
solenoid valve is removed.
Terminal
Resistance
1 and 2
7.0 - 7.7
Ω
at 20
°
C (68
°
F)
1 or 2 and ground
∞Ω
(Continuity should not exist.)
PBIB0193E
PBIB2275E
EC-112
< COMPONENT DIAGNOSIS >
[VQ40DE]
P0101 MAF SENSOR
P0101 MAF SENSOR
Component Description
INFOID:0000000001370677
The mass air flow sensor (1) is placed in the stream of intake air. It
measures the intake flow rate by measuring a part of the entire
intake flow. The mass air flow sensor controls the temperature of the
hot wire to a certain amount. The heat generated by the hot wire is
reduced as the intake air flows around it. The more air, the greater
the heat loss.
Therefore, the electric current supplied to hot wire is changed to
maintain the temperature of the hot wire as air flow increases. The
ECM detects the air flow by means of this current change.
On Board Diagnosis Logic
INFOID:0000000001370679
DTC Confirmation Procedure
INFOID:0000000001370680
Perform PROCEDURE FOR MALFUNCTION A first.
If the DTC cannot be confirmed, perform PROCEDURE FOR MALFUNCTION B.
NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next step.
PROCEDURE FOR MALFUNCTION A
NOTE:
If engine will not start or stops soon, wait at least 10 seconds with engine stopped (Ignition switch ON) instead
of running engine at idle speed.
1.
Turn ignition switch OFF and wait at least 10 seconds.
2.
Turn ignition switch ON.
3.
Turn ignition switch OFF and wait at least 10 seconds.
With CONSULT-III
1.
Start engine and warm it up to normal operating temperature.
2.
Run engine for at least 10 seconds at idle speed.
3.
Check 1st trip DTC.
4.
If 1st trip DTC is detected, go to
With GST
Follow the procedure “With CONSULT-III” above.
PROCEDURE FOR MALFUNCTION B
PBIA9559J
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0101
0101
Mass air flow sensor cir-
cuit range/performance
A)
A high voltage from the sensor is sent to ECM
under light load driving condition.
• Harness or connectors
(The sensor circuit is open or
shorted.)
• Mass air flow sensor
• EVAP control system pressure
sensor
• Intake air temperature sensor
B)
A low voltage from the sensor is sent to ECM un-
der heavy load driving condition.
• Harness or connectors
(The sensor circuit is open or
shorted.)
• Intake air leaks
• Mass air flow sensor
• EVAP control system pressure
sensor
• Intake air temperature sensor
P0101 MAF SENSOR
EC-113
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CAUTION:
Always drive vehicle at a safe speed.
With CONSULT-III
1.
Start engine and warm it up to normal operating temperature.
If engine cannot be started, go to
2.
Select “DATA MONITOR” mode with CONSULT-III.
3.
Check the voltage of “MAS A/F SE-B1” with “DATA MONITOR”.
4.
Increases engine speed to about 4,000 rpm.
5.
Monitor the linear voltage rise in response to engine speed
increases.
If NG, go to
.
If OK, go to following step.
6.
Maintain the following conditions for at least 10 consecutive seconds.
7.
Check 1st trip DTC.
8.
If 1st trip DTC is detected, go to
Overall Function Check
INFOID:0000000001370681
PROCEDURE FOR MALFUNCTION B
Use this procedure to check the overall function of the mass air flow sensor circuit. During this check, a 1st trip
DTC might not be confirmed.
With GST
1.
Start engine and warm it up to normal operating temperature.
2.
Select Service $01 with GST.
PBIB3457E
ENG SPEED
More than 2,000 rpm
THRTL SEN 1
More than 3V
THRTL SEN 2
More than 3V
Selector lever
Suitable position
Driving location
Driving vehicle uphill (Increased engine load) will help
maintain the driving conditions required for this test.
EC-114
< COMPONENT DIAGNOSIS >
[VQ40DE]
P0101 MAF SENSOR
3.
Check the mass air flow sensor signal with Service $01.
4.
Check for linear mass air flow sensor signal value rise in
response to increases to about 4,000 rpm in engine speed.
5.
If NG, go to
Diagnosis Procedure
INFOID:0000000001370683
1.
INSPECTION START
Which malfunction (A or B) is duplicated?
A or B
A
>> GO TO 3.
B
>> GO TO 2.
2.
CHECK INTAKE SYSTEM
Check the following for connection.
• Air duct
• Vacuum hoses
• Intake air passage between air duct and intake manifold
OK or NG
OK
>> GO TO 3.
NG
>> Reconnect the parts.
3.
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 4.
NG
>> Repair or replace ground connections.
4.
CHECK MAF SENSOR POWER SUPPLY CIRCUIT
1.
Disconnect mass air flow (MAF) sensor harness connector.
2.
Turn ignition switch ON.
SEF534P
BBIA0539E
BBIA0541E
P0101 MAF SENSOR
EC-115
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3.
Check voltage between MAF sensor terminal 2 and ground with
CONSULT-III or tester.
OK or NG
OK
>> GO TO 6.
NG
>> GO TO 5.
5.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E2, F32
• Harness for open or short between IPDM E/R and mass air flow sensor
• Harness for open or short between mass air flow sensor and ECM
>> Repair harness or connectors.
6.
CHECK MAF SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check harness continuity between MAF sensor terminal 3 and ECM terminal 67.
Refer to Wiring Diagram.
4.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 7.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
7.
CHECK MAF SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Check harness continuity between MAF sensor terminal 4 and ECM terminal 51.
Refer to Wiring Diagram.
2.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 8.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
8.
CHECK INTAKE AIR TEMPERATURE SENSOR
EC-125, "Component Inspection"
OK or NG
OK
>> GO TO 9.
NG
>> Replace intake air temperature sensor.
9.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-254, "Component Inspection"
OK or NG
OK
>> GO TO 10.
NG
>> Replace EVAP control system pressure sensor.
10.
CHECK MASS AIR FLOW SENSOR
EC-116, "Component Inspection"
.
Voltage: Battery voltage
PBIB1168E
Continuity should exist.
Continuity should exist.
EC-116
< COMPONENT DIAGNOSIS >
[VQ40DE]
P0101 MAF SENSOR
OK or NG
OK
>> GO TO 11.
NG
>> Replace mass air flow sensor.
11.
CHECK INTERMITTENT INCIDENT
.
>> INSPECTION END
Component Inspection
INFOID:0000000001370684
MASS AIR FLOW SENSOR
With CONSULT-III
1.
Reconnect all harness connectors disconnected.
2.
Start engine and warm it up to normal operating temperature.
3.
Connect CONSULT-III and select “DATA MONITOR” mode.
4.
Select “MAS A/F SE-B1” and check indication under the following conditions.
*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
5.
If the voltage is out of specification, proceed the following.
a.
Check for the cause of uneven air flow through mass air flow sensor. Refer to following.
• Crushed air ducts
• Malfunctioning seal of air cleaner element
• Uneven dirt of air cleaner element
• Improper specification of intake air system parts
b.
If NG, repair or replace malfunctioning part and perform step 2 to 4 again.
If OK, go to next step.
6.
Turn ignition switch OFF.
7.
Disconnect mass air flow sensor harness connector and reconnect it again.
8.
Perform step 2 to 4 again.
9.
If NG, clean or replace mass air flow sensor.
Without CONSULT-III
1.
Reconnect all harness connectors disconnected.
2.
Start engine and warm it up to normal operating temperature.
3.
Check voltage between ECM terminal 51 (Mass air flow sensor
signal) and ground.
Condition
MAS A/F SE-B1 (V)
Ignition switch ON (Engine stopped.)
Approx. 0.4
Idle (Engine is warmed-up to normal
operating temperature.)
0.9 - 1.2
2,500 rpm (Engine is warmed-up to
normal operating temperature.)
1.5 - 1.8
Idle to about 4,000 rpm
0.9 - 1.2 to Approx. 2.4*
Condition
Voltage V
Ignition switch ON (Engine stopped.)
Approx. 0.4
Idle (Engine is warmed-up to normal
operating temperature.)
0.9 - 1.2
2,500 rpm (Engine is warmed-up to
normal operating temperature.)
1.5 - 1.8
Idle to about 4,000 rpm
0.9 - 1.2 to Approx. 2.4*
PBIB1106E
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