Infiniti FX35 / FX45. Manual — part 112
ATC-44
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
Shifting from STEP-5 to AUXILIARY MECHANISM is accomplished by means of pressing (fan) UP switch.
FUNCTION CONFIRMATION PROCEDURE
1.
SET IN SELF-DIAGNOSIS MODE
1.
Turn ignition switch ON.
2.
Set in self-diagnosis mode as follows. Within 10 seconds after starting engine (ignition switch is turned
ON.), press OFF switch for at least 5 seconds.
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. To avoid this, start engine before
performing this diagnosis.
• Former STEP-1 (LEDs and display screen are checked) does not exist in this self-diagnosis function.
>> GO TO 2.
2.
STEP-2: SENSOR CIRCUITS ARE CHECKED FOR OPEN OR SHORT CIRCUIT
SJIA1571E
TROUBLE DIAGNOSIS
ATC-45
< SERVICE INFORMATION >
C
D
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F
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B
ATC
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Does code No. 20 appear on the display?
YES
>> GO TO 3.
NO
>> GO TO 13.
3.
CHECK TO ADVANCE SELF-DIAGNOSIS STEP-3
Press temperature control (UP) switch (driver side).
Advance to self-diagnosis STEP-3?
YES
>> GO TO 4.
NO
>> Replace A/C and AV switch. (Temperature control switch is malfunctioning.)
4.
CHECK TO RETURN SELF-DIAGNOSIS STEP-2
Press temperature control (DOWN) switch (driver side).
Return to self-diagnosis STEP-2?
YES
>> GO TO 5.
NO
>> Malfunctioning A/C and AV switch or unified meter and A/C amp. Refer to
5.
STEP-3: MODE DOOR AND INTAKE DOOR POSITIONS ARE CHECKED
Press temperature control (UP) switch (driver side).
Does code No. 30 appear on the display?
YES
>> GO TO 6.
NO
>> GO TO 14.
6.
STEP-4: OPERATION OF EACH DOOR MOTOR IS CHECKED
1.
Press temperature control (UP) switch (driver side).
2.
Press
(DEF) switch. Code No. of each door motor test is
indicated on the display.
>> GO TO 7.
7.
CHECK ACTUATORS
SJIA1778E
SJIA1779E
SJIA1780E
ATC-46
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
Refer to the following chart and check discharge air flow, air temper-
ature, blower motor duty ratio and compressor operation.
Checks must be made visually, by listening the sound, or by touching air outlets with hand, etc. for improper
operation.
*1: FOOT position during automatic control. Refer to "AUXILIARY MECHANISM: FOOT POSITION SETTING
TRIMMER".
OK or NG
OK
>> GO TO 8.
NG
>> • Air outlet does not change.
Go to Mode Door Motor Circuit. Refer to
ATC-57, "Mode Door Motor Circuit"
• Intake door does not change.
Go to Intake Door Motor Circuit. Refer to
ATC-62, "Intake Door Motor Circuit"
.
• Discharge air temperature does not change.
Go to Air Mix Door Motor Circuit. Refer to
ATC-59, "Air Mix Door Motor Circuit"
.
• Blower motor operation is malfunctioning.
Go to Blower Motor Circuit. Refer to
ATC-64, "Blower Motor Circuit"
.
• Magnet clutch does not engage.
Go to Magnet Clutch Circuit. Refer to
ATC-69, "Magnet Clutch Circuit"
8.
STEP-5: TEMPERATURE OF EACH SENSOR IS CHECKED
1.
Press temperature control (UP) switch (driver side).
2.
Code No. 51 appears on the display.
>> GO TO 9.
9.
CHECK AMBIENT SENSOR
Press
(DEF) switch one time. Temperature detected by ambient
sensor is indicated on the display.
NOTE:
If the temperature indicated on the display greatly differs from the
actual temperature, check sensor circuit first, and then check sensor.
OK or NG
OK
>> GO TO 10.
NG
>> Go to Ambient Sensor Circuit. Refer to
SJIA0302E
Code No.
41
42
43
44
45
46
Mode door position
VENT
B/L 1
B/L 2
FOOT
*1
D/F
DEF
Intake door position
REC
REC
20% FRE
FRE
FRE
FRE
Air mix door position
FULL COLD
FULL COLD
FULL HOT
FULL HOT
FULL HOT
FULL HOT
Blower motor duty ratio
37%
91%
65%
65%
65%
91%
Compressor
ON
ON
OFF
OFF
ON
ON
Electronic control valve
(ECV) duty ratio
100%
100%
0%
0%
50%
100%
PJIA0151E
TROUBLE DIAGNOSIS
ATC-47
< SERVICE INFORMATION >
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ATC
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10.
CHECK IN-VEHICLE SENSOR
Press
(DEF) switch for the second time. Temperature detected
by in-vehicle sensor is indicated on the display.
NOTE:
If the temperature indicated on the display greatly differs from the
actual temperature, check sensor circuit first, and then check sensor.
OK or NG
OK
>> GO TO 11.
NG
>> Go to In-vehicle Sensor Circuit. Refer to
11.
CHECK INTAKE SENSOR
Press
(DEF) switch for the third time. Temperature detected by
intake sensor is indicated on the display.
NOTE:
If the temperature indicated on the display greatly differs from the
actual temperature, check sensor circuit first, and then check sensor.
OK or NG
OK
>> GO TO 12.
NG
>> Go to Intake Sensor Circuit. Refer to
.
12.
CHECK CAN COMMUNICATION ERROR
1.
Press intake switch.
2.
CAN communication error between the unified meter and A/C
amp. and the display control unit can be detected as self-diag-
nosis results. (If plural errors occur, the display of each error will
blink twice for 0.5 second intervals.)
OK or NG
OK
>> 1.
Turn ignition switch OFF or AUTO switch ON.
2.
INSPECTION END
NG
>>
Go to CAN communication. Refer to
.
• Unified meter and A/C amp. - Display control unit
13.
CHECK MALFUNCTIONING SENSOR AND DOOR MOTOR
Refer to the following chart for malfunctioning code No.
(If two or more sensors and door motors malfunction, corresponding code Nos. indicates 1 second each.)
*1: Perform self-diagnosis STEP-2 under sunshine.
PJIA0152E
PJIA0153E
SJIA1611E
Code No.
Malfunctioning sensor and door motor (Including circuits)
Reference page
21 /
−
21
Ambient sensor
ATC-86, "Ambient Sensor Circuit"
22 /
−
22
In-vehicle sensor
ATC-88, "In-vehicle Sensor Circuit"
24 /
−
24
Intake sensor
ATC-94, "Intake Sensor Circuit"
25 /
−
25
Sunload sensor
*1
ATC-91, "Sunload Sensor Circuit"
26 /
−
26
Air mix door motor PBR (Driver side)
ATC-62, "Air Mix Door Motor PBR Circuit"
27 /
−
27
Air mix door motor PBR (Passenger side)
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