Infiniti M35/M45 Y50. Manual — part 126
TROUBLE DIAGNOSIS
ATC-55
C
D
E
F
G
H
I
K
L
M
A
B
ATC
65
O
ECV (Electric Control Valve)
signal
ON
Self-diagnosis. STEP-4
(Code No. 45)
69
R
A/C LAN signal
ON
—
70
W
Power supply for each door
motor
ON
—
Battery voltage
71
B
Ground (Power)
ON
—
Approx. 0
72
P
CAN-L
—
—
—
Terminal
No.
Wire
color
Item
Ignition
switch
Condition
Voltage
(V)
SJIA1607E
SJIA1453J
ATC-56
TROUBLE DIAGNOSIS
Self-diagnosis Function
NJS000GJ
DESCRIPTION
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
will be canceled by either pressing AUTO switch or turning the ignition switch OFF. Shifting from one step is
accomplished by means of pressing temperature control switch (driver side), as required.
Shifting from STEP-5 to AUXILIARY MECHANISM is accomplished by means of pressing (fan) UP switch.
RJIA4034E
TROUBLE DIAGNOSIS
ATC-57
C
D
E
F
G
H
I
K
L
M
A
B
ATC
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
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 Multifunction 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 multifunction 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.
SJIA1778E
SJIA1779E
ATC-58
TROUBLE DIAGNOSIS
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
Refer to the following chart and check discharge air flow, air temperature, blower motor duty ratio and com-
pressor operation.
SJIA1780E
RJIA4035E
Code No.
41
42
43
44
45
46
Mode door position
VENT
B/L 1
B/L 2
FOOT
*1
D/F
DEF
Upper ventilator door
position
OPEN
SHUT
SHUT
SHUT
SHUT
SHUT
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%
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