Infiniti G35 (V35) Sedan. Manual - part 503

EC-158

< COMPONENT DIAGNOSIS >

[VQ35HR]

P0078, P0084 EVT CONTROL MAGNET RETARDER

1.

Replace malfunctioning exhaust valve timing control magnet retarder.

2.

Perform 

EC-20, "EXHAUST VALVE TIMING CONTROL LEARNING : Special Repair Requirement"

.

>> INSPECTION END

P0101, P010B MAF SENSOR

EC-159

< COMPONENT DIAGNOSIS >

[VQ35HR]

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P0101, P010B MAF SENSOR

Description

INFOID:0000000000956550

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.

DTC Logic

INFOID:0000000000956551

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
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.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A

PBIA9559J

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0101

Mass air flow sensor 
(bank 1) circuit 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

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

P010B

Mass air flow sensor 
(bank 2) circuit 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

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

EC-160

< COMPONENT DIAGNOSIS >

[VQ35HR]

P0101, P010B MAF SENSOR

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.

Is 1st trip DTC detected?

YES

>> Go to 

EC-161, "Diagnosis Procedure"

.

NO-1

>> With CONSULT-III: GO TO 3.

NO-2

>> Without CONSULT-III: GO TO 5.

3.

CHECK MASS AIR FLOW SENSOR FUNCTION

1.

Turn ignition switch ON.

2.

Start engine and warm it up to normal operating temperature.
If engine cannot be started, go to 

EC-161, "Diagnosis Procedure"

.

3.

Select “DATA MONITOR” mode with CONSULT-III.

4.

Check the voltage of “MAS A/F SE-B1/B2” with “DATA MONI-
TOR”.

5.

Increases engine speed to about 4,000 rpm.

6.

Monitor the linear voltage rise in response to engine speed
increases.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Go to 

EC-161, "Diagnosis Procedure"

.

4.

PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B

1.

Maintain the following conditions for at least 10 consecutive seconds.

CAUTION:

Always drive vehicle at a safe speed.

2.

Check 1st rip DTC.

Is 1st trip DTC detected?

YES

>> Go to 

EC-161, "Diagnosis Procedure"

.

NO

>> INSPECTION END

5.

PERFORM COMPONENT FUNCTION CHECK FOR MALFUNCTION B

Perform component function check. Refer to 

EC-161, "Component Function Check"

.

PBIB3457E

ENG SPEED

More than 2,000 rpm

TP SEN 1-B1

More than 3V

TP SEN 2-B1

More than 3V

TP SEN 1-B2

More than 3V

TP SEN 2-B

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.

P0101, P010B MAF SENSOR

EC-161

< COMPONENT DIAGNOSIS >

[VQ35HR]

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EC

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NOTE:
Use component function check to check the overall function of the mass air flow sensor circuit. During this
check, a 1st trip DTC might not be confirmed.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-161, "Diagnosis Procedure"

.

Component Function Check

INFOID:0000000000956552

1.

PERFORM COMPONENT FUNCTION CHECK FOR MALFUNCTION B

 With GST

1.

Start engine and warm it up to normal operating temperature.

2.

Select Service $01 with GST.

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.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-161, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000000956553

1.

INSPECTION START

Confirm the detected malfunction (A or B). Refer to 

EC-159, "DTC Logic"

.

Which malfunction is detected?

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

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Reconnect the parts.

3.

CHECK GROUND CONNECTION

1.

Turn ignition switch OFF.

2.

Check ground connection M95. Refer to Ground Inspection in 

GI-42, "Circuit Inspection"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace ground connection.

4.

CHECK MAF SENSOR POWER SUPPLY CIRCUIT

1.

Disconnect mass air flow (MAF) sensor harness connector.

2.

Turn ignition switch ON.

3.

Check the voltage between MAF sensor harness connector and ground.

SEF534P