Infiniti FX35, FX50 (S51). Manual — part 1165
DIAGNOSIS SYSTEM (UNIFIED METER & A/C AMP.)
HAC-57
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONER]
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DIAGNOSIS SYSTEM (UNIFIED METER & A/C AMP.)
WITHOUT ACCS
WITHOUT ACCS : Diagnosis Description
INFOID:0000000005246243
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-6, "WITHOUT ACCS : Temperature Setting Trimmer"
.
- Foot position setting trimmer. Refer to
HAC-58
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONER]
DIAGNOSIS SYSTEM (UNIFIED METER & A/C AMP.)
- Inlet port memory function. Refer to
HAC-8, "WITHOUT ACCS : Inlet Port Memory 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.
• 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
JMIIA0489GB
DIAGNOSIS SYSTEM (UNIFIED METER & A/C AMP.)
HAC-59
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONER]
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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.
Checks must be made visually, by listening the sound, or by touching air outlets with hand, etc. for improper
operation. Refer to
.
Is this inspection result normal?
YES
>> GO TO 6.
NO-1
>> Air outlet does not change. Refer to
.
NO-2
>> Intake door does not change. Refer to
HAC-76, "WITHOUT ACCS : Diagnosis Procedure"
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%
HAC-60
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONER]
DIAGNOSIS SYSTEM (UNIFIED METER & A/C AMP.)
NO-3
>> Discharge air temperature (driver side) does not change. Refer to
.
NO-4
>> Discharge air temperature (passenger side) does not change. Refer to
NO-5
>> Blower motor operation is malfunctioning. Refer to
.
NO-6
>> Magnet clutch does not engage. Refer to
6.
STEP-5: TEMPERATURE OF EACH SENSOR IS CHECKED
1.
Turn temperature control dial (driver side) clockwise.
2.
Code No. 51 appears on the display.
>> GO TO 7.
7.
CHECK AMBIENT SENSOR
Press DEF (
) switch one time. Temperature detected by ambient
sensor is indicated on the display.
NOTE:
Check sensor circuit first if the temperature indicated on the display
greatly differs from the actual temperature, and then check sensor.
Is this inspection result normal?
YES
>> GO TO 8.
NO
>> Go to Ambient Sensor Circuit. Refer to
.
8.
CHECK IN-VEHICLE SENSOR
Press DEF (
) switch for the second time. Temperature detected
by in-vehicle sensor is indicated on the display.
NOTE:
Check sensor circuit first if the temperature indicated on the display
greatly differs from the actual temperature, and then check sensor.
Is this inspection result normal?
YES
>> GO TO 9.
NO
>> Go to In-vehicle Sensor Circuit. Refer to
.
9.
CHECK INTAKE SENSOR
Press DEF (
) switch for the third time. Temperature detected by
intake sensor is indicated on the display.
NOTE:
Check sensor circuit first if the temperature indicated on the display
greatly differs from the actual temperature, and then check sensor.
Is this inspection result normal?
YES
>> GO TO 10.
NO
>> Go to Intake Sensor Circuit. Refer to
10.
CHECK CAN COMMUNICATION ERROR
PJIA0151E
PJIA0152E
PJIA0153E
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