Infiniti M35/M45 Y50. Manual - part 142

TROUBLE DIAGNOSIS

ATC-119

C

D

E

F

G

H

I

K

L

M

A

B

ATC

2. 

CHECK CIRCUIT CONTINUITY BETWEEN SUNLOAD SENSOR AND UNIFIED METER AND A/C AMP.

1.

Turn ignition switch OFF.

2.

Disconnect unified meter and A/C amp. connector.

3.

Check continuity between sunload sensor harness connector
M87 terminal 2 and unified meter and A/C amp. harness con-
nector M65 terminal 62.

OK or NG

OK

>> GO TO 3.

NG

>> Repair harness or connector.

3. 

CHECK SUNLOAD SENSOR

1.

Reconnect sunload sensor connector and unified meter and A/C amp. connector.

2.

Refer to 

ATC-120, "Sunload Sensor"

 .

OK or NG

OK

>> 1. Replace unified meter and A/C amp.

2. Go to self-diagnosis 

ATC-57, "FUNCTION CONFIRMATION PROCEDURE"

  and perform self-

diagnosis STEP-2. Confirm that code No. 20 is displayed.

NG

>> 1. Replace sunload sensor.

2. Go to self-diagnosis 

ATC-57, "FUNCTION CONFIRMATION PROCEDURE"

  and perform self-

diagnosis STEP-2. Confirm that code No. 20 is displayed.

4. 

CHECK CIRCUIT CONTINUITY BETWEEN SUNLOAD SENSOR AND UNIFIED METER AND A/C AMP.

1.

Turn ignition switch OFF.

2.

Disconnect unified meter and A/C amp. connector.

3.

Check continuity between sunload sensor harness connector
M87 terminal 1 and unified meter and A/C amp. harness con-
nector M65 terminal 46.

4.

Check continuity between sunload sensor harness connector
M87 terminal 1 and ground.

OK or NG

OK

>> 1. Replace unified meter and A/C amp.

2. Go to self-diagnosis 

ATC-57, "FUNCTION CONFIRMATION PROCEDURE"

  and perform self-

diagnosis STEP-2. Confirm that code No. 20 is displayed.

NG

>> Repair harness or connector.

2 – 62

: Continuity should exist.

RJIA4100E

1 – 46

: Continuity should exist.

1 – Ground

: Continuity should not exist.

RJIA4101E

ATC-120

TROUBLE DIAGNOSIS

COMPONENT INSPECTION
Sunload Sensor

Measure voltage between unified meter and A/C amp. harness con-
nector M65 terminal 46 and ground.

●

When checking sunload sensor, select a place where sunshine directly on it.

If NG, replace sunload sensor.

RJIA4102E

SHA930E

TROUBLE DIAGNOSIS

ATC-121

C

D

E

F

G

H

I

K

L

M

A

B

ATC

Intake Sensor Circuit

NJS000H3

COMPONENT DESCRIPTION
Intake Sensor

The intake sensor is located on the heater & cooling unit assembly. It
converts temperature of air after it passes through the evaporator
into a resistance value which is then input to the unified meter and A/
C amp.

DIAGNOSIS PROCEDURE FOR INTAKE SENSOR

SYMPTOM: Intake sensor circuit is open or shorted. (24 or 

−

24 is

indicated on unified meter and A/C amp. as a result of performing
self-diagnosis STEP-2.)

1. 

CHECK VOLTAGE BETWEEN INTAKE SENSOR AND GROUND

1.

Disconnect intake sensor  connector.

2.

Turn ignition switch ON.

3.

Check voltage between intake sensor harness connector M82
terminal 1 and ground.

OK or NG

OK

>> GO TO 2.

NG

>> GO TO 4.

2. 

CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND UNIFIED METER AND A/C AMP.

1.

Turn ignition switch OFF.

2.

Disconnect unified meter and A/C amp. connector.

3.

Check continuity between intake sensor harness connector M82
terminal 2 and unified meter and A/C amp. harness connector
M65 terminal 59.

OK or NG

OK

>> GO TO 3.

NG

>> Repair harness or connector.

RJIA4103E

RJIA4104E

1 – Ground

: Approx. 5 V

RJIA4215E

2 – 59

: Continuity should exist.

RJIA4106E

ATC-122

TROUBLE DIAGNOSIS

3. 

CHECK INTAKE SENSOR

Refer to 

ATC-122, "Intake Sensor"

 .

OK or NG

OK

>> 1. Replace unified meter and A/C amp.

2. Go to self-diagnosis 

ATC-57, "FUNCTION CONFIRMATION PROCEDURE"

  and perform self-

diagnosis STEP-2. Confirm that code No. 20 is displayed.

NG

>> 1. Replace intake sensor.

2. Go to self-diagnosis 

ATC-57, "FUNCTION CONFIRMATION PROCEDURE"

  and perform self-

diagnosis STEP-2. Confirm that code No. 20 is displayed.

4. 

CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND UNIFIED METER AND A/C AMP.

1.

Turn ignition switch OFF.

2.

Disconnect unified meter and A/C amp. connector.

3.

Check continuity between intake sensor harness connector M82
terminal 1 and unified meter and A/C amp. harness connector
M65 terminal 43.

4.

Check continuity between intake sensor harness connector M82
terminal 1 and ground.

OK or NG

OK

>> 1. Replace unified meter and A/C amp.

2. Go to self-diagnosis 

ATC-57, "FUNCTION CONFIRMATION PROCEDURE"

  and perform self-

diagnosis STEP-2. Confirm that code No. 20 is displayed.

NG

>> Repair harness or connector.

COMPONENT INSPECTION
Intake Sensor

After disconnecting intake sensor connector M82, measure resis-
tance between terminals 1 and 2 at sensor side. Refer to the table
below.

If NG, replace intake sensor.

1 – 43

: Continuity should exist.

1 – Ground

: Continuity should not exist.

RJIA4105E

Temperature 

°

C (

°

F)

Resistance k

Ω

−

15 (5)

12.34

−

10 (14)

9.62

−

5 (23)

7.56

0 (32)

6.00

5 (41)

4.80

10 (50)

3.87

15 (59)

3.15

20 (68)

2.57

25 (77)

2.12

30 (86)

1.76

35 (95)

1.47

40 (104)

1.23

45 (113)

1.04

RJIA4107E