Infiniti FX35, FX50 (S51). Manual - part 1166

 

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Infiniti FX35, FX50 (S51). Manual - part 1166

 

 

DIAGNOSIS SYSTEM (UNIFIED METER & A/C AMP.)

HAC-61

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

1.

Press intake switch.

2.

CAN communication error between each unit that uses the uni-
fied meter and A/C amp. can be detected as self-diagnosis
results. (The display of each error will blink twice for 0.5 second
intervals if plural errors occur.)

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to CAN communication (Unified meter and A/C amp.

– AV control unit). Refer to 

MWI-49,

"Diagnosis Procedure"

.

11.

CHECK MALFUNCTIONING SENSOR AND DOOR MOTOR

Refer to the following chart for malfunctioning code No.
(Corresponding code Nos. indicates 1 second each if two or more sensors and door motors malfunction.)
(Corresponding code Nos. indicates 0.5 second each if two door motors malfunction.)

*: Perform self-diagnosis STEP-2 under sunshine.
When performing indoors, aim a light (more than 60 W) at sunload sensor, otherwise code No. 25 indicates
despite that sunload sensor is functioning normally.

>> INSPECTION END

12.

CHECK MALFUNCTIONING DOOR MOTOR POSITION SWITCH

Mode and/or intake door motor PBR(s) is/are malfunctioning.

(Corresponding code Nos. indicates 1 second each if two or more mode or intake door motors malfunction.)
*1: The following display pattern will appear if mode door motor harness connector is disconnected.
31

32

Return to 31

*2: The following display pattern will appear if intake door motor harness connector is disconnected.

JSIIA0138GB

Code No.

Malfunctioning sensor and door motor (Including circuits)

Reference

21 / 

21

Ambient sensor

HAC-88, "Diagnosis Procedure"

22 / 

22

In-vehicle sensor

HAC-91, "Diagnosis Procedure"

24 / 

24

Intake sensor

HAC-97, "Diagnosis Procedure"

25 / 

25

Sunload sensor 

*

HAC-94, "Diagnosis Procedure"

26 / 

26

Air mix door motor PBR (Driver side)

HAC-72, "Diagnosis Procedure"

27 / 

27

Air mix door motor PBR (Passenger side)

HAC-74, "Diagnosis Procedure"

SJIA1781E

Code No. 

*1 *2

Mode or intake door position

Reference

31

VENT

Mode door motor

HAC-70, "Diagnosis Procedure"

32

DEF

37

FRE

Intake door motor

HAC-76, "WITHOUT ACCS : Diagnosis 

Procedure"

38

20% FRE

39

REC

HAC-62

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

DIAGNOSIS SYSTEM (UNIFIED METER & A/C AMP.)

37

38

39

Return to 37

>> INSPECTION END

WITHOUT ACCS : CONSULT-III Function

INFOID:0000000005246244

CONSULT-III APPLICATION ITEMS

CONSULT-III can display each diagnosis item using the diagnosis test modes shown as per the following.

DATA MONITOR

Display Item List

WITH ACCS

WITH ACCS : Diagnosis Description

INFOID:0000000005246245

SELF-DIAGNOSIS SYSTEM

The self-diagnosis system is built into the unified meter and A/C amp. to quickly locate the cause of malfunc-
tions.

SELF-DIAGNOSIS FUNCTION

• The self-diagnosis system diagnoses sensors, door motors, blower motor, etc. by system line. Refer to appli-

cable sections (items) for details. Shifting from normal control to the self-diagnosis system is accomplished
by starting the engine (turning the ignition switch ON) and pressing OFF switch for at least 5 seconds. The
OFF switch must be pressed within 10 seconds after starting the engine (ignition switch is turned ON). This
system is canceled by either pressing AUTO switch or turning the ignition switch OFF. Shifting from one step
is accomplished by means of turning temperature control dial (driver side), as required.

• Shifting from STEP-5 to AUXILIARY MECHANISM is accomplished by means of pressing fan (UP: +)

switch.

- Temperature setting trimmer. Refer to 

HAC-11, "WITH ACCS : Temperature Setting Trimmer"

.

- Foot position setting trimmer. Refer to 

HAC-12, "WITH ACCS : Foot Position Setting Trimmer"

.

- Inlet port memory function. Refer to 

HAC-13, "WITH ACCS : Inlet Port Memory Function"

.

- Gas sensor sensitivity adjustment function. Refer to 

HAC-13, "WITH ACCS : Gas Sensor Sensitivity Adjust-

ment Function"

.

SJIA1782E

System part

Check item, diagnosis mode

Description

ECM

Data monitor

Displays ECM input data in real time.

Monitor Item

Condition

Value/Status

IGNITION SW

Ignition switch OFF 

 ON

Off 

 On

HEATER FAN SW

Ignition switch ON

Blower fan motor switch ON

On

Blower fan motor switch OFF

Off

AIR COND SIG

Ignition switch ON

Compressor ON

On

Compressor OFF

Off

REFRIGERANT PRESSURE 
SENSOR

• Engine is running
• Warm-up condition
• Both A/C switch and blower fan motor switch: ON (Compressor 

operates)

1.0 – 4.0 V

DIAGNOSIS SYSTEM (UNIFIED METER & A/C AMP.)

HAC-63

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

- Auto intake interlocking movement change function. Refer to 

HAC-14, "WITH ACCS : Auto Intake Interlock-

ing Movement Change Function"

.

CONFORMATION METHOD

1.

SET IN SELF-DIAGNOSIS MODE

1.

Turn ignition switch ON.

2.

Set in self-diagnosis mode as per the following. Press OFF switch for at least 5 seconds Within 10 sec-
onds after starting engine (ignition switch is turned ON).

NOTE:
• If battery voltage drops below 12 V during diagnosis STEP-3, door motor speed becomes slower and as a

result, the system may generate an error even when operation is normal. Start engine before performing this
diagnosis to avoid this.

• Former STEP-1 (indicators and display screen are checked) does not exist in this self-diagnosis function.

JMIIA0490GB

HAC-64

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

DIAGNOSIS SYSTEM (UNIFIED METER & A/C AMP.)

• OFF switch may not be recognized according to the timing of pressing it. Operate OFF switch after the

intake switch indicators are turned ON.

>> GO TO 2.

2.

STEP-2: SENSOR AND DOOR MOTOR CIRCUITS ARE CHECKED FOR OPEN OR SHORT CIRCUIT

Does code No. 20 appear on the display?

YES

>> GO TO 3.

NO

>> GO TO 11.

3.

STEP-3: MODE DOOR AND INTAKE DOOR POSITIONS ARE CHECKED

Turn temperature control dial (driver side) clockwise.

Does code No. 30 appear on the display?

YES

>> GO TO 4.

NO

>> GO TO 12.

4.

STEP-4: OPERATION OF EACH DOOR MOTOR IS CHECKED

1.

Turn temperature control dial (driver side) clockwise.

2.

Press DEF (

) switch. Code No. of each door motor test is

indicated on the display.

>> GO TO 5.

5.

CHECK ACTUATORS

Refer to the following chart and check discharge air flow, air temperature, blower motor duty ratio and com-
pressor operation.

SJIA1778E

SJIA1779E

SJIA1780E

Code  No.

41

42

43

44

45

46

Mode door position

VENT

B/L 1

B/L 2

FOOT

D/F

DEF

Intake door position

REC

REC

20% FRE

FRE

FRE

FRE

Air mix door position

FULL COOL

FULL COOL

FULL HOT

FULL HOT

FULL HOT

FULL HOT

Blower motor duty ratio

37%

91%

65%

65%

65%

91%

Compressor (Magnet 
clutch)

ON

ON

OFF

OFF

ON

ON

Electronic control valve 
(ECV) duty ratio

100%

100%

0%

0%

50%

100%

 

 

 

 

 

 

 

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