Infiniti M45 (Y34). Manual — part 148
TROUBLE DIAGNOSIS
ATC-77
C
D
E
F
G
H
I
K
L
M
A
B
ATC
Blower Speed Compensation
Sunload
When the in-vehicle temperature and the set temperature are very close, the blower will be operating at low
speed. The low speed will vary depending on the sunload. During conditions of low or no sunload, the blower
low speed is normal low speed (duty ratio 25%). During high sunload conditions, the auto amp causes the
blower fan speed to increase (duty ratio 49%).
Fan Speed Control Specification
COMPONENT DESCRIPTION
Brush-Less Motor
The blower motor utilizes a brush-less motor with a rotating magnet.
Quietness is improved over previous motors where the brush was
the point of contact and the coil rotated.
DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR
SYMPTOM: Blower motor operation is malfunctioning under Starting
Fan Speed Control.
RJIA1907E
ZHA152H
RJIA0900E
ATC-78
TROUBLE DIAGNOSIS
1.
CHECK POWER SUPPLY FOR BLOWER MOTOR
1.
Disconnect blower motor connector.
2.
Turn ignition switch ON.
3.
Check voltage between blower motor harness connector M112
terminal 1 (L/W) and ground.
OK or NG
OK
>> GO TO 2.
NG
>> Check power supply circuit and 15A fuses [Nos. 31 and
33, located in the fuse block (J/B) No. 2]. Refer to
63, "FUSE BLOCK - JUNCTION BOX (J/B) NO.2"
●
If OK, check for open circuit in wiring harness. Repair or replace if necessary.
●
If NG, replace fuse and check wiring harness for short circuit. Repair or replace if necessary.
2.
CHECK GROUND CIRCUIT FOR BLOWER MOTOR
1.
Turn ignition switch OFF.
2.
Check continuity between blower motor harness connector
M112 terminal 3 (B) and ground.
OK or NG
OK
>> GO TO 3.
NG
>> Repair harness or connector.
3.
CHECK CIRCUIT CONTINUITY BLOWER MOTOR AND AUTO AMP.
1.
Disconnect auto amp. connector.
2.
Check continuity between blower motor harness connector
M112 terminal 2 (L/OR) and auto amp. harness connector M120
terminal 35 (L/OR).
OK or NG
OK
>> GO TO 4.
NG
>> Repair harness or connector.
1 – Ground
: Battery voltage
RJIA1997E
3 – Ground
: Continuity should exist.
RJIA1998E
2 – 35
: Continuity should exist.
RJIA0903E
TROUBLE DIAGNOSIS
ATC-79
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D
E
F
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H
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A
B
ATC
4.
CHECK FOR AUTO AMP. OUTPUT
1.
Reconnect blower motor connector and auto amp. connector.
2.
Turn ignition switch ON.
3.
Vary the fan speed between Lo and Hi and confirm the blower
motor connector terminal 2 (L/OR) duty ratios using an oscillo-
scope. Usual terminal 2 (L/OR) drive signal duty ratios are
shown in the table below.
OK or NG
OK
>> GO TO 5.
NG
>> Replace auto amp.
5.
CHECK BLOWER MOTOR DRIVE SIGNAL
If the fan air flow does not change, usual terminal 2 (L/OR) drive signal duty ratios are shown in the table
above.
OK or NG
OK
>> Replace blower motor.
NG
>> INSPECTION END
COMPONENT INSPECTION
Blower Motor
Confirm smooth rotation of the blower motor.
●
Ensure that there are no foreign particles inside the intake unit.
RJIA2000E
RJIA1294E
RJIA0271E
ATC-80
TROUBLE DIAGNOSIS
Magnet Clutch Circuit
AJS000CE
SYMPTOM: Magnet clutch does not engage.
INSPECTION FLOW
*1
ATC-50, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 1.
*2
ATC-101, "Ambient Sensor Circuit"
*3
ATC-50, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 14.
*4
ATC-81, "DIAGNOSTIC PROCE-
DURE FOR MAGNET CLUTCH"
*5
ATC-92, "TROUBLE DIAGNOSIS
FOR UNUSUAL PRESSURE"
*6
*7
ATC-50, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 5 to 7.
*8
*9
ATC-109, "Intake Sensor Circuit"
.
RJIA1295E
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