Infiniti M45 (Y34). Manual — part 147
TROUBLE DIAGNOSIS
ATC-73
C
D
E
F
G
H
I
K
L
M
A
B
ATC
SYSTEM DESCRIPTION
Component Parts
Intake door control system components are:
●
Auto amp.
●
Intake door motor
●
A/C LAN system (PBR built-in mode door motor, air mix door motor and intake door motor)
●
In-vehicle sensor
●
Ambient sensor
●
Sunload sensor
●
Intake sensor
System Operation
The intake door control determines intake door position based on the ambient temperature, the intake air tem-
perature and the in-vehicle temperature. When the ECON, DEFROST or OFF switches are pushed, the auto
amp. sets the intake door at the FRESH position.
Intake Door Control Specification
RJIA1291E
RHA383H
ATC-74
TROUBLE DIAGNOSIS
COMPONENT DESCRIPTION
Intake Door Motor
The intake door motor is attached to the intake unit. It rotates so that
air is drawn from inlets set by the auto amp. Motor rotation is con-
veyed to a lever which activates the intake door.
DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR
SYMPTOM: Intake door motor does not operate normally.
Perform diagnostic procedure. Refer to
ATC-62, "DIAGNOSTIC PROCEDURE FOR LAN CIRCUIT"
RJIA0280E
TROUBLE DIAGNOSIS
ATC-75
C
D
E
F
G
H
I
K
L
M
A
B
ATC
Blower Motor Circuit
AJS001F1
SYMPTOM:
●
Blower motor operation is malfunctioning.
●
Blower motor operation is malfunctioning under out of starting fan speed control.
INSPECTION FLOW
*1
*2
ATC-50, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No.1.
*3
ATC-50, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No.5.
*4
ATC-50, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No.7.
*5
ATC-50, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No.14.
*6
ATC-77, "DIAGNOSTIC PROCE-
DURE FOR BLOWER MOTOR"
.
*7
ATC-75, "Blower Motor Circuit"
.
*8
ATC-101, "Ambient Sensor Circuit"
*9
ATC-103, "In-Vehicle Sensor Circuit"
.
*10
ATC-106, "Sunload Sensor Circuit"
*11
ATC-109, "Intake Sensor Circuit"
*12
RJIA1292E
ATC-76
TROUBLE DIAGNOSIS
SYSTEM DESCRIPTION
Component Parts
Fan speed control system components are:
●
Auto amp.
●
A/C LAN system (PBR built-in mode door motor, air mix door motor and intake door motor)
●
In-vehicle sensor
●
Ambient sensor
●
Sunload sensor
●
Intake sensor
System Operation
Automatic Mode
In the automatic mode, the blower motor speed is calculated by the auto amp. based on input from the PBR,
in-vehicle sensor, sunload sensor, intake sensor and ambient sensor.
When the air flow is increased, the duty ratio of the blower fan motor's drive signal is changed at 8% sec to
prevent a sudden increase in air flow.
In addition to manual air flow control and the normal automatic air flow control, starting air flow control, low
water temperature starting control and high passenger compartment temperature starting control are avail-
able.
When the audio-recognition signal is input to the auto amp., the maximum fan speed is limited to the 3rd step.
(Except DEF).
Starting Fan Speed Control
Start Up from COLD SOAK Condition (Automatic mode)
In a cold start up condition where the engine coolant temperature is below 56
°
C (133
°
F), the blower will not
operate for a short period of time (up to 150 seconds). The exact start delay time varies depending on the
ambient and engine coolant temperature.
In the most extreme case (very low ambient) the blower starting delay will be 150 seconds as described
above. After this delay, the blower will operate at low speed until the engine coolant temperature rises above
56
°
C (133
°
F), at which time the blower speed will increase to the objective speed.
Start Up from Normal or HOT SOAK Condition (Automatic mode)
The blower will begin operation momentarily after the AUTO switch is pushed. The blower speed will gradually
rise to the objective speed over a time period of 3 seconds or less (actual time depends on the objective
blower speed).
RJIA1293E
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