Infiniti M35/M45 Y50. Manual - part 140

TROUBLE DIAGNOSIS

ATC-111

C

D

E

F

G

H

I

K

L

M

A

B

ATC

Memory Function

NJS000GZ

SYMPTOM: Memory function does not operate.

INSPECTION FLOW

*1

ATC-67, "Power Supply and Ground 
Circuit for Auto Amp."

*2

ATC-65, "Operational Check"

*3

ATC-57, "FUNCTION CONFIRMA-
TION PROCEDURE"

RJIA4086E

ATC-112

TROUBLE DIAGNOSIS

Ambient Sensor Circuit

NJS000H0

COMPONENT DESCRIPTION
Ambient Sensor

The ambient sensor is attached on the radiator core support (left
side). It detects ambient temperature and converts it into a resis-
tance value which is then input into the unified meter and A/C amp.

AMBIENT TEMPERATURE INPUT PROCESS

The unified meter and A/C amp. includes a processing circuit for the ambient sensor input. However, when the
temperature detected by the ambient sensor increases quickly, the processing circuit retards the unified meter
and A/C amp. function. It only allows the unified meter and A/C amp. to recognize an ambient temperature
increase of 0.33

°

C (0.6

°

F) per 100 seconds.

As an example, consider stopping for a few minutes after high speed driving. Although the actual ambient tem-
perature has not changed, the temperature detected by the ambient sensor will increase. This is because the
heat from the engine compartment can radiate to the front bumper area, location of the ambient sensor.

DIAGNOSIS PROCEDURE FOR AMBIENT SENSOR

SYMPTOM: Ambient sensor circuit is open or shorted. (21 or 

−

21 is

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

1. 

CHECK VOLTAGE BETWEEN AMBIENT SENSOR AND GROUND

1.

Disconnect ambient sensor connector.

2.

Turn ignition switch ON.

3.

Check voltage between ambient sensor harness connector E62
terminal 1 and ground.

OK or NG

OK

>> GO TO 2.

NG

>> GO TO 4.

RJIA4087E

RJIA4088E

1 – Ground

: Approx. 5 V

RJIA2017E

TROUBLE DIAGNOSIS

ATC-113

C

D

E

F

G

H

I

K

L

M

A

B

ATC

2. 

CHECK CIRCUIT CONTINUITY BETWEEN AMBIENT 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 ambient sensor harness connector
E62 terminal 2 and unified meter and A/C amp. harness connec-
tor M65 terminal 61.

OK or NG

OK

>> GO TO 3.

NG

>> Repair harness or connector.

3. 

CHECK AMBIENT SENSOR

Refer to 

ATC-114, "Ambient 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 ambient 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 AMBIENT 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 ambient sensor harness connector
E62 terminal 1 and unified meter and A/C amp. harness connec-
tor M65 terminal 45.

4.

Check continuity between ambient sensor harness connector
E62 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 – 61

: Continuity should exist.

RJIA4089E

1 – 45

: Continuity should exist.

1 – Ground

: Continuity should not exist.

RJIA4090E

ATC-114

TROUBLE DIAGNOSIS

COMPONENT INSPECTION
Ambient Sensor

After disconnecting ambient sensor connector E62, measure resis-
tance between terminals 1 and 2 at sensor side. Refer to the table
below.

If NG, replace ambient sensor.

Temperature 

°

C (

°

F)

Resistance k

Ω

 

−

15 (5)

12.73

 

−

10 (14)

9.92

 

−

5 (23)

7.80

0 (32)

6.19

5 (41)

4.95

10 (50)

3.99

15 (59)

3.24

20 (68)

2.65

25 (77)

2.19

30 (86)

1.81

35 (95)

1.51

40 (104)

1.27

45 (113)

1.07

RJIA4091E