Nissan Maxima. Manual - part 427

 

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Nissan Maxima. Manual - part 427

 

 

EC-192

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P0102, P0103 MAF SENSOR

3. Check the voltage between ECM harness connector terminals

under the following conditions.

*: 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 2.

2.

CHECK FOR THE CAUSE OF UNEVEN AIR FLOW VIA THE MASS AIR FLOW SENSOR

Check for the cause of uneven air flow via the mass air flow sensor. Refer to the following.

• Crushed air ducts

• Malfunctioning seal of air cleaner element

• Uneven dirt of air cleaner element

• Improper specification of intake air system parts
Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 3.

3.

CHECK MASS AIR FLOW SENSOR-II

With CONSULT

1. Repair or replace malfunctioning part.

2. Start engine and warm it up to normal operating temperature.

3. Connect CONSULT 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.

Without CONSULT

1. Repair or replace malfunctioning part.

2. Start engine and warm it up to normal operating temperature.

ECM

Condition

Voltage (V)

Con-

nector

+

Terminal

Terminal

F13

58

(MAF 

sensor 
signal)

56

(Sensor 
ground)

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.)

1.6 - 1.9

Idle to about 4,000 rpm

0.9 - 1.2 to 

Approx. 2.4*

JMBIA1862ZZ

Monitor item

Condition

MAS A/F SE-B1 (V)

MAS A/F SE-B1

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.)

1.6 - 1.9

Idle to about 4,000 rpm

0.9 - 1.2 to Approx. 2.4*

P0102, P0103 MAF SENSOR

EC-193

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

3. Check the voltage between ECM harness connector terminals

under the following conditions.

*: 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

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 and select “DATA MONITOR” mode.

5. 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.

Without CONSULT

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 terminals

under the following conditions.

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

Is the inspection result normal?

ECM

Condition

Voltage (V)

Con-

nector

+

Terminal

Terminal

F13

58

(MAF 

sensor 
signal)

56

(Sensor 
ground)

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.)

1.6 - 1.9

Idle to about 4,000 rpm

0.9 - 1.2 to 

Approx. 2.4*

JMBIA1862ZZ

Monitor item

Condition

MAS A/F SE-B1 (V)

MAS A/F SE-B1

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.)

1.6 - 1.9

Idle to about 4,000 rpm

0.9 - 1.2 to Approx. 2.4*

ECM

Condition

Voltage (V)

Con-

nector

+

Terminal

Terminal

F13

58

(MAF 

sensor 
signal)

56

(Sensor 
ground)

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.)

1.6 - 1.9

Idle to about 4,000 rpm

0.9 - 1.2 to 

Approx. 2.4*

JMBIA1862ZZ

EC-194

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P0102, P0103 MAF SENSOR

YES

>> INSPECTION END

NO

>> Clean or replace mass air flow sensor. Refer to 

EM-24, "Removal and Installation"

.

P0111 IAT SENSOR

EC-195

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

C

D

E

F

G

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EC

N

P

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P0111 IAT SENSOR

Description

INFOID:0000000010094895

The intake air temperature sensor is built-into the mass air flow sen-

sor (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 rise in temperature.

<Reference data>

*: These data are reference values and are measured between ECM terminals 50
(Intake air temperature sensor) and 56 (Sensor ground).

DTC Logic

INFOID:0000000010094896

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

INSPECTION START

Is it necessary to erase permanent DTC?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

PERFORM COMPONENT FUNCTION CHECK

Perform component function check. Refer to 

EC-196, "Component Function Check"

.

NOTE:

Use the component function check to check the overall function of the IAT sensor circuit. During this check, a

1st trip DTC might not be confirmed.
Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Proceed to 

EC-196, "Diagnosis Procedure"

.

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

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P0111

IAT SENSOR 1 B1
[Intake air temperature (IAT) 
sensor circuit range/perfor-
mance]

The comparison result of signals transmitted 
to ECM from each temperature sensor (IAT 
sensor, ECT sensor, FTT sensor, and EOT 
sensor) shows that the voltage signal of the 
IAT sensor is higher/lower than that of other 
temperature sensors when the engine is 
started with its cold state.

• Harness or connectors

(High or low resistance in the IAT sen-
sor circuit)

• IAT sensor

 

 

 

 

 

 

 

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