2008 INFINITI FX35 Service Manual

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Page 465 of 3924

INFINITI FX35 2008 Service Manual
ATC-60
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
SYSTEM DESCRIPTION
Component Parts
Air mix door control system components are:
Unified meter and A/C amp.
Air mix door motor (LCU)
A/C LAN syste

Page 466 of 3924

INFINITI FX35 2008 Service Manual
TROUBLE DIAGNOSISATC-61
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Sunload sensor
Intake sensor
System Operation
The unified meter and A/C amp. receives data from each of the sens

Page 467 of 3924

INFINITI FX35 2008 Service Manual
ATC-62
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR MOTOR
SYMPTOM: Discharge air temperature does not change.
Perform diagnosis procedure. Refer to ATC-54, "
LAN Sys

Page 468 of 3924

INFINITI FX35 2008 Service Manual
TROUBLE DIAGNOSISATC-63
< SERVICE INFORMATION >
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SYSTEM DESCRIPTION
Component Parts
Intake door control system components are: Unified meter and A/C amp.
Intake do

Page 469 of 3924

INFINITI FX35 2008 Service Manual
ATC-64
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
Intake sensor
System Operation
The intake door control determines intake door position based on the ambient temperature, the intake air tem-
peratur

Page 470 of 3924

INFINITI FX35 2008 Service Manual
TROUBLE DIAGNOSISATC-65
< SERVICE INFORMATION >
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SYSTEM DESCRIPTION
Component Parts
Fan speed control system components are:
Unified meter and A/C amp.
A/C LAN sy

Page 471 of 3924

INFINITI FX35 2008 Service Manual
ATC-66
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
Intake sensor
System Operation
Automatic Mode
In the automatic mode, the blower motor speed is calculated by the unified meter and A/C amp. based on

ATC-66
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
Intake sensor
System Operation
Automatic Mode
In the automatic mode, the blower motor speed is calculated by the unified meter and A/C amp. based on the
input from the PBR, in-vehicle sensor, sunl oad 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 automat ic air flow control, starting air flow control, low
water temperature starting control and high passenger co mpartment 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 lo w speed until the engine coolant temperature rises above
56 °C (133 °F), and then 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 AU TO switch is pressed. The blower speed will gradu-
ally rise to the objective speed over a time period of 3 seconds or less (actual time depends on the objective
blower speed).
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. Du ring conditions of low or no sunload, the blower
speed is at duty ratio 25%. During high sunload conditi ons, the unified meter and A/C amp. raise the blower
speed (duty ratio 49%).
Fan Speed Control Specification
RJIA1995E
RJIA1996E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

Page 472 of 3924

INFINITI FX35 2008 Service Manual
TROUBLE DIAGNOSISATC-67
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COMPONENT DESCRIPTION
Brush-Less Motor
The blower motor utilizes a brush-less motor with a rotating magnet.
Quietness

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