Infiniti G35 (V35). Manual — part 101
TROUBLE DIAGNOSIS
ATC-75
C
D
E
F
G
H
I
K
L
M
A
B
ATC
SYSTEM DESCRIPTION
Component Parts
Intake door control system components are:
●
Display and A/C auto amp.
●
Intake door motor (LCU)
●
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 DEF switch is pressed, the display and A/C auto amp. sets
the intake door at the FRE position. When the OFF switch is pressed, the display and A/C auto amp. operates
the intake doors are automatically controlled.
Intake Door Control Specification
RJIA1644E
RJIA1645E
ATC-76
TROUBLE DIAGNOSIS
COMPONENT DESCRIPTION
Intake Door Motor
The intake door motor is attached to the blower unit. It rotates so that
air is drawn from inlets set by the display and A/C auto amp. Motor
rotation is conveyed to a lever which activates the intake door.
DIAGNOSIS PROCEDURE FOR INTAKE DOOR MOTOR
SYMPTOM: Intake door motor does not operate normally.
Perform diagnosis procedure. Refer to
ATC-64, "DIAGNOSIS PROCEDURE FOR LAN CIRCUIT"
.
RJIA0897E
TROUBLE DIAGNOSIS
ATC-77
C
D
E
F
G
H
I
K
L
M
A
B
ATC
Blower Motor Circuit
NJS0003J
SYMPTOM: Blower motor operation is malfunctioning.
INSPECTION FLOW
*1
*2
ATC-52, "FUNCTION CONFIR-
MATION PROCEDURE"
, see No.
1.
*3
ATC-52, "FUNCTION CONFIRMATION
PROCEDURE"
, see No. 5.
*4
ATC-52, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 7.
*5
ATC-52, "FUNCTION CONFIR-
MATION PROCEDURE"
, see No.
14.
*6
ATC-79, "DIAGNOSIS PROCEDURE
FOR BLOWER MOTOR"
*7
*8
ATC-100, "Ambient Sensor Cir-
cuit"
*9
ATC-103, "In-vehicle Sensor Circuit"
*10
ATC-106, "Sunload Sensor Circuit"
*11
ATC-109, "Intake Sensor Circuit"
*12
EC-227, "DTC P0117, P0118 ECT SEN-
SOR"
RJIA3507E
ATC-78
TROUBLE DIAGNOSIS
SYSTEM DESCRIPTION
Component Parts
Fan speed control system components are:
●
Display and A/C 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 display and A/C auto amp. based on the
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 usual automatic air flow control, starting air flow control, low
water temperature starting control and high passenger compartment temperature starting control are avail-
able.
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 usual or HOT SOAK Condition (Automatic mode)
The blower will begin operation momentarily after the A/C switch is pressed. 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).
RJIA3508E
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