Infiniti F50. Manual — part 136
TROUBLE DIAGNOSIS
ATC-69
C
D
E
F
G
H
I
K
L
M
A
B
ATC
6.
CHECK MOTOR OPERATION
Disconnect and reconnect the motor connector and confirm the motor operation.
OK or NG
OK
>> (Return to operate normally.)
●
Poor contacting the motor connector
NG
>> (Does not operate normally.)
●
GO TO 7.
7.
CHECK MODE DOOR MOTOR OPERATION
1.
Disconnect mode door motor (driver side, passenger side) and air mix door motor (driver side, passenger
side) connector.
2.
Reconnect mode door motor connector (driver side, passenger side) and confirm the mode door motor
operation.
OK or NG
OK
>> (Mode door motor operates normally.)
●
GO TO 8.
NG
>> (Mode door motor does not operate normally.)
●
GO TO 10.
8.
CHECK AIR MIX DOOR MOTOR OPERATION
1.
Disconnect mode door motor connector (driver side, passenger side).
2.
Reconnect air mix door motor connector (driver side, passenger side) and confirm the air mix door motor
operation.
OK or NG
OK
>> (Air mix door motor operates normally.)
●
GO TO 9.
NG
>> (Air mix door motor does not operate normally.)
●
GO TO 11.
9.
CHECK INTAKE DOOR MOTOR OPERATION
1.
Disconnect air mix door motor connector (driver side, passenger side).
2.
Reconnect intake door motor connector and confirm the intake door motor operation.
OK or NG
OK
>> (Intake door motor operates normally.)
●
Replace auto amp.
NG
>> (Intake door motor does not operate normally.)
●
Replace intake door motor.
10.
CHECK MODE DOOR MOTOR OPERATION
1.
Disconnect mode door motor (driver side) connector.
2.
Confirm the mode door motor (passenger side) operation.
OK or NG
OK
>> (Mode door motor operates normally.)
●
Replace driver side mode door motor.
NG
>> (Mode door motor does not operate normally.)
●
Replace passenger side mode door motor.
ATC-70
TROUBLE DIAGNOSIS
11.
CHECK AIR MIX DOOR MOTOR OPERATION
1.
Disconnect air mix door motor (driver side) connector.
2.
Confirm the air mix door motor (passenger side) operation.
OK or NG
OK
>> (Air mix door motor operates normally.)
●
Replace driver side air mix door motor.
NG
>> (Air mix door motor does not operate normally.)
●
Replace passenger side air mix door motor.
TROUBLE DIAGNOSIS
ATC-71
C
D
E
F
G
H
I
K
L
M
A
B
ATC
Mode Door Motor Circuit
EJS000JO
SYMPTOM:
●
Air outlet does not change.
●
Mode door motor does not operate normally.
INSPECTION FLOW
*1
*2
*3
ATC-54, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No.1.
*4
ATC-54, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 5 to 7.
*5
ATC-108, "Ambient Sensor Circuit"
*6
ATC-110, "In-Vehicle Sensor Cir-
cuit"
.
*7
ATC-113, "Sunload Sensor Circuit"
.
*8
ATC-74, "Air Mix Door Motor Cir-
cuit"
.
*9
ATC-54, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No.14.
RJIA1567E
ATC-72
TROUBLE DIAGNOSIS
SYSTEM DESCRIPTION
Component Parts
Mode door control system components are:
●
Auto amp.
●
Mode door motor (LCU)
●
In-vehicle sensor
●
Ambient sensor
●
Sunload sensor
●
Intake sensor
System Operation
The auto amplifier receives data from each of the sensors. The amplifier sends air mix door, mode door and
intake door opening angle data to the air mix door motor LCU, mode door motor LCU and intake door motor
LCU.
The air mix door motor, mode door motor and intake door motor read their respective signals according to the
address signal. Opening angle indication signals received from the auto amplifier and each of the motor posi-
tion sensors are compared by the LCUs in each motor with the existing decision and opening angles. Subse-
quently, HOT/COLD or DEFROST/VENT or FRESH/RECIRCULATION operation is selected. The new
selection data is returned to the auto amplifier.
Mode Door Control Specification
*10
*11
ATC-73, "COMPONENT DESCRIP-
TION"
for Mode door.
*12
.
*13
ATC-116, "Intake Sensor Circuit"
RJIA1287E
RHA384HA
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