Infiniti G35 (V35) Sedan. Manual - part 506

EC-170

< COMPONENT DIAGNOSIS >

[VQ35HR]

P0102, P0103, P010C, P010D MAF SENSOR

*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 4.

4.

CHECK MASS AIR FLOW SENSOR-III

 With CONSULT-III

1.

Turn ignition switch OFF.

2.

Disconnect mass air flow sensor harness connector and reconnect it again.

3.

Start engine and warm it up to normal operating temperature.

4.

Connect CONSULT-III and select “DATA MONITOR” mode.

5.

Select “MAS A/F SE-B1” and “MAS A/F SE-B2”, and check the indication.

*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.

 Without CONSULT-III

1.

Turn ignition switch OFF.

2.

Disconnect mass air flow sensor harness connector and reconnect it again.

3.

Start engine and warm it up to normal operating temperature.

4.

Check the voltage between ECM harness connector and ground.

*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Clean or replace malfunctioning mass air flow sensor.

ECM

Ground

Condition

Voltage

Connector

Terminal

F102

77 [MAF sensor (bank 1) signal]
79 [MAF sensor (bank 2) signal]

Ground

Ignition switch ON (Engine stopped.)

Approx. 0.4V

Idle (Engine is warmed-up to normal operat-
ing temperature.)

0.8 - 1.1V

2,500 rpm (Engine is warmed-up to normal 
operating temperature.)

1.4 - 1.7V

Idle to about 4,000 rpm

0.8 - 1.1V to Approx. 2.4V*

Monitor item

Condition

Indication

MAS A/F SE-B1
MAS A/F SE-B2

Ignition switch ON (Engine stopped.)

Approx. 0.4V

Idle (Engine is warmed-up to normal operating temperature.)

0.8 - 1.1V

2,500 rpm (Engine is warmed-up to normal operating temperature.)

1.4 - 1.7V

Idle to about 4,000 rpm

0.8 - 1.1V to Approx. 2.4V*

ECM

Ground

Condition

Voltage

Connector

Terminal

F102

77 [MAF sensor (bank 1) signal]
79 [MAF sensor (bank 2) signal]

Ground

Ignition switch ON (Engine stopped.)

Approx. 0.4V

Idle (Engine is warmed-up to normal operat-
ing temperature.)

0.8 - 1.1V

2,500 rpm (Engine is warmed-up to normal 
operating temperature.)

1.4 - 1.7V

Idle to about 4,000 rpm

0.8 - 1.1V to Approx. 2.4V*

P0112, P0113 IAT SENSOR

EC-171

< COMPONENT DIAGNOSIS >

[VQ35HR]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

P0112, P0113 IAT SENSOR

Description

INFOID:0000000000956559

The intake air temperature sensor is built-into mass air flow sensor
(1). The sensor detects intake air temperature and transmits a signal
to the ECM.
The temperature sensing unit uses a thermistor which is sensitive to
the change in temperature. Electrical resistance of the thermistor
decreases in response to the temperature rise.
NOTE:
ECM uses only the intake air temperature sensor (bank 1) for engine
control and self-diagnosis. It does not use the intake air temperature
sensor (bank 2).

<Reference data>

*: These data are reference values and are measured between ECM terminal 67
(Intake air temperature sensor) and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing
so may result in damage to the ECM’s transistor. Use a ground other than ECM
terminals, such as the ground.

DTC Logic

INFOID:0000000000956560

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.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON and wait at least 5 seconds.

2.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to 

EC-171, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000000956561

1.

CHECK GROUND CONNECTION

PBIA9559J

Intake air temperature

°

C (

°

F)

Voltage*

V

Resistance

k

Ω

25 (77)

3.3

1.800 - 2.200

80 (176)

1.2

0.283 - 0.359

SEF012P

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0112

Intake air temperature sensor 
(bank 1) circuit low input

An excessively low voltage from the sensor is 
sent to ECM.

• Harness or connectors

(The sensor circuit is open or short-
ed.)

• Intake air temperature sensor

P0113

Intake air temperature sensor 
(bank 1) circuit high input

An excessively high voltage from the sensor is 
sent to ECM.

EC-172

< COMPONENT DIAGNOSIS >

[VQ35HR]

P0112, P0113 IAT SENSOR

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 2.

NO

>> Repair or replace ground connection.

2.

CHECK INTAKE AIR TEMPERATURE SENSOR POWER SUPPLY CIRCUIT

1.

Disconnect mass air flow sensor (intake air temperature sensor is built-into) (bank 1) harness connector.

2.

Turn ignition switch ON.

3.

Check the voltage between mass air flow sensor (bank 1) harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair open circuit or short to ground or short to power in harness or connectors.

3.

CHECK INTAKE AIR TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between mass air flow sensor (bank 1) harness connector and ECM harness con-
nector.

4.

Also check harness for short to ground and short to power.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair open circuit or short to ground or short to power in harness or connectors.

4.

CHECK INTAKE AIR TEMPERATURE SENSOR

Refer to 

EC-172, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace mass air flow sensor (with intake air temperature sensor) (bank 1).

5.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-39, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000000956562

1.

CHECK INTAKE AIR TEMPERATURE SENSOR

1.

Turn ignition switch OFF.

2.

Disconnect mass air flow sensor (bank 1) harness connector.

3.

Check resistance between mass air flow sensor (bank 1) terminals as follows.

Is the inspection result normal?

YES

>> INSPECTION END

MAF sensor (bank 1)

Ground

Voltage

Connector

Terminal

F31

2

Ground

Approx. 5

MAF sensor (bank 1)

ECM

Continuity

Connector

Terminal

Connector

Terminal

F31

1

F102

68

Existed

Terminals

Condition

Resistance

1 and 2

Temperature 

°

C (

°

F)

25 (77)

1.800 - 2.200 k

Ω

P0112, P0113 IAT SENSOR

EC-173

< COMPONENT DIAGNOSIS >

[VQ35HR]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

NO

>> Replace mass air flow sensor (with intake air temperature sensor) (bank 1).