ATC-60
TROUBLE DIAGNOSIS
SYSTEM DESCRIPTION
Component Parts
Mode door control system components are:
●
Auto amp.
●
Mode door motor (LCU)
●
A/C LAN system (PBR built-in air mix door motor, mode door motor and intake door motor)
●
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
ATC-56, "LAN System Circuit"
*11
ATC-61, "COMPONENT DESCRIP-
TION"
*12
ATC-50, "Operational Check"
*13
ATC-29, "SYMPTOM TABLE"
*14
ATC-103, "Intake Sensor Circuit"
*15
ATC-51, "CHECKING DISCHARGE
AIR"
RJIA0773E
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