Infiniti FX35 / FX45. Manual - part 503

 

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Infiniti FX35 / FX45. Manual - part 503

 

 

DTC P0102, P0103 MAF SENSOR

EC-773

< SERVICE INFORMATION >

[VK45DE]

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8.

CHECK MASS AIR FLOW SENSOR

Refer to 

EC-773, "Component Inspection"

.

OK or NG

OK

>> GO TO 9.

NG

>> Replace mass air flow sensor.

9.

CHECK INTERMITTENT INCIDENT

Refer to 

EC-717

.

>> INSPECTION END

Component Inspection

INFOID:0000000001326601

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.

Condition

MAS A/F SE-B1 (V)

Ignition switch ON (Engine stopped.)

Approx. 0.4

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

1.0 - 1.3

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

1.6 - 2.0

Idle to about 4,000 rpm

1.0 - 1.3 to Approx. 2.4*

EC-774

< SERVICE INFORMATION >

[VK45DE]

DTC P0102, P0103 MAF SENSOR

3.

Check voltage between ECM terminal 51 (Mass air flow sensor
signal) and ground.

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

4.

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 and 3 again.
If OK, go to next step.

5.

Turn ignition switch OFF.

6.

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

7.

Perform step 2 and 3 again.

8.

If NG, clean or replace mass air flow sensor.

Removal and Installation

INFOID:0000000001326602

MASS AIR FLOW SENSOR

Refer to 

EM-173

.

Condition

Voltage V

Ignition switch ON (Engine stopped.)

Approx. 0.4

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

1.0 - 1.3

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

1.6 - 2.0

Idle to about 4,000 rpm

1.0 - 1.3 to Approx. 2.4*

PBIB1106E

DTC P0112, P0113 IAT SENSOR

EC-775

< SERVICE INFORMATION >

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DTC P0112, P0113 IAT SENSOR

Component Description

INFOID:0000000001326603

The intake air temperature sensor is built-into mass air flow sensor.
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.

<Reference data>

*: These data are reference values and are measured between ECM terminal 34
(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.

On Board Diagnosis Logic

INFOID:0000000001326604

DTC Confirmation Procedure

INFOID:0000000001326605

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.

1.

Turn ignition switch ON and wait at least 5 seconds.

2.

Check 1st trip DTC.

3.

If 1st trip DTC is detected, go to 

EC-776, "Diagnosis Procedure"

.

PBIB1604E

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
0112

Intake air tempera-
ture sensor circuit 
low input

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

• Harness or connectors

(The sensor circuit is open or shorted.)

• Intake air temperature sensor

P0113
0113

Intake air tempera-
ture sensor circuit 
high input

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

EC-776

< SERVICE INFORMATION >

[VK45DE]

DTC P0112, P0113 IAT SENSOR

Wiring Diagram

INFOID:0000000001326606

Diagnosis Procedure

INFOID:0000000001326607

1.

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

Loosen and retighten three ground screws on the body.

TBWM0723E

 

 

 

 

 

 

 

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