Infiniti M45 (Y34). Manual — part 141
TROUBLE DIAGNOSIS
ATC-49
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ATC
Self-Diagnosis Function
AJS000C6
DESCRIPTION
The self-diagnostic 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-diagnostic 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
will be canceled by either pressing AUTO switch or turning the ignition switch OFF. Shifting from one step to
another is accomplished by means of turning temperature dial, as required.
Additionally shifting from STEP-5 to AUXILIARY MECHANISM is accomplished by means of pushing (fan)
UP switch.
RJIA1268E
ATC-50
TROUBLE DIAGNOSIS
FUNCTION CONFIRMATION PROCEDURE
1.
SET IN SELF-DIAGNOSTIC MODE
1.
Turn ignition switch ON.
2.
Set in self-diagnostic mode as follows. Within 10 seconds after starting engine (ignition switch is turned
ON.), press OFF switch for at least 5 seconds.
CAUTION:
If battery voltage drops below 12V during diagnosis step-3, actuator 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.
>> GO TO 2.
2.
STEP-1: LEDS AND DISPLAY ARE CHECKED
Check LED illumination and display screen.
OK or NG
OK
>> GO TO 3.
NG
>> Malfunctioning OFF switch, LED or auto amp. Refer to
3.
CHECK TO ADVANCE SELF-DIAGNOSIS STEP-2
Turn the temperature dial (driver side) clockwise.
Advance to self-diagnosis STEP-2?
YES
>> GO TO 4.
NO
>> Replace multifunction switch. (Temperature dial malfunctions.)
4.
CHECK TO RETURN SELF-DIAGNOSIS STEP-1
Turn the temperature dial (driver side) counterclockwise.
Return to self-diagnosis STEP-1?
YES
>> GO TO 5.
NO
>> Replace multifunction switch. (Temperature dial malfunctions.)
RJIA1565E
RJIA1269E
TROUBLE DIAGNOSIS
ATC-51
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ATC
5.
STEP-2: SENSOR CIRCUITS ARE CHECKED FOR OPEN OR SHORT CIRCUIT
Turn the temperature dial (driver side) clockwise.
Does code No. 20 appear on the display?
YES
>> GO TO 6.
NO
>> GO TO 14.
6.
STEP-3: MODE DOOR AND INTAKE DOOR POSITIONS ARE CHECKED
Turn the temperature dial (driver side) clockwise.
Does code No. 30 appear on the display?
YES
>> GO TO 7.
NO
>> GO TO 15.
7.
STEP-4: OPERATION OF EACH ACTUATOR IS CHECKED
1.
Turn the temperature dial (driver side) clockwise.
2.
Press
(DEF) switch, code No. of each actuator test is indi-
cated on the display.
>> GO TO 8.
RJIA0219E
RJIA0220E
RJIA0221E
ATC-52
TROUBLE DIAGNOSIS
8.
CHECK ACTUATORS
Refer to the following chart and confirm discharge air flow, air temperature, blower motor voltage and com-
pressor operation.
Checks must be made visually, by listening to any noise, or by touching air outlets with your hand, etc. for
improper operation.
OK or NG
OK
>> GO TO 9.
NG
>>
●
Air outlet does not change.
Go to Mode Door Motor Circuit. Refer to
ATC-66, "Mode Door Motor Circuit"
●
Intake door does not change.
Go to Intake Door Motor Circuit. Refer to
ATC-72, "Intake Door Motor Circuit"
●
Blower motor operation is malfunctioning.
Go to Blower Motor Circuit. Refer to
ATC-75, "Blower Motor Circuit"
●
Magnet clutch does not engage.
Go to Magnet Clutch Circuit Refer to
ATC-80, "Magnet Clutch Circuit"
●
Discharge air temperature does not change.
Go to Air Mix Door Motor Circuit. Refer to
ATC-69, "Air Mix Door Motor Circuit"
.
RJIA1270E
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Mode door position
(Driver side)
VENT
(B/L
OPEN)
VENT
(B/L
SHUT)
B/L1
(B/L
SHUT)
B/L1
(B/L
OPEN)
B/L2
FOOT
D/F
DEF
Mode door position
(Passenger side)
VENT
(B/L
OPEN)
VENT
(B/L
SHUT)
B/L1
(B/L
SHUT)
B/L1
(B/L
OPEN)
B/L2
FOOT1
FOOT2
DEF
Intake door position
REC
REC
REC
20% FRE
20% FRE
FRE
FRE
FRE
Air mix door position
FULL
COLD
FULL
COLD
FULL
COLD
FULL HOT
FULL HOT
FULL HOT
FULL HOT
FULL HOT
Blower motor duty ratio
37%
37%
91%
65%
65%
65%
65%
91%
Compressor
ON
ON
ON
OFF
OFF
OFF
ON
ON
Electronic control valve
(ECV) duty ratio
100%
50%
100%
0%
0%
0%
50%
100%
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