Infiniti F50. Manual — part 137
TROUBLE DIAGNOSIS
ATC-73
C
D
E
F
G
H
I
K
L
M
A
B
ATC
COMPONENT DESCRIPTION
Mode Door Motor
The mode door motor is attached to the heater & cooling unit. It
rotates so that air is discharged from the outlet set by the auto ampli-
fier. Motor rotation is conveyed to a link which activates the mode
door.
DIAGNOSTIC PROCEDURE FOR MODE DOOR MOTOR
SYMPTOM: Mode door motor does not operate normally.
Perform diagnostic procedure for LAN system circuit. Refer to
ATC-67, "DIAGNOSTIC PROCEDURE FOR
.
RJIA0283E
RJIA0284E
ATC-74
TROUBLE DIAGNOSIS
Air Mix Door Motor Circuit
EJS000JP
SYMPTOM:
●
Discharge air temperature does not change.
●
Air mix door motor does not operate.
INSPECTION FLOW
*1
ATC-54, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No.1.
*2
ATC-108, "Ambient Sensor Circuit"
*3
ATC-110, "In-Vehicle Sensor Circuit"
*4
ATC-113, "Sunload Sensor Circuit"
*5
ATC-74, "Air Mix Door Motor Circuit"
. *6
ATC-54, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 14.
*7
.
*8
ATC-76, "COMPONENT DESCRIP-
TION"
*9
*10
*11
ATC-116, "Intake Sensor Circuit"
*12
ATC-54, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No.5 to 7.
RJIA1568E
TROUBLE DIAGNOSIS
ATC-75
C
D
E
F
G
H
I
K
L
M
A
B
ATC
SYSTEM DESCRIPTION
Component Parts
Air mix door control system components are:
●
Auto amp.
●
Air mix 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 motor 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.
Air Mix Door Control Specification
RJIA1289E
RHA457H
ATC-76
TROUBLE DIAGNOSIS
COMPONENT DESCRIPTION
Air Mix Door Motor
The air mix door motor is attached to the heater & cooling unit. It
rotates so that the air mix door is opened or closed to a position set
by the auto amplifier. Motor rotation is then conveyed through a shaft
and the air mix door position is then fed back to the auto amplifier by
PBR built-in air mix door motor.
DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR
SYMPTOM: Discharge air temperature does not change.
Perform diagnostic procedure for LAN system circuit. Refer to
ATC-67, "DIAGNOSTIC PROCEDURE FOR
Air Mix Door Motor PBR Circuit
EJS001Y8
SYMPTOM: If PBR circuit is open or shorted. (26/-26 or 27/-27 is indicated on auto amp. as a result of con-
ducting Self-diagnosis STEP-2.)
DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR PBR
Perform diagnostic procedure for LAN system circuit. Refer to
ATC-67, "DIAGNOSTIC PROCEDURE FOR
RJIA0287E
RJIA0288E
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