NISSAN ALMERA N16 2003 Electronic Repair Manual

TROUBLE DIAGNOSIS
ATC-61
C
D
E
F
G
H
I
K
L
MA
B
AT C
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
RJIA0773E
RHA384HA

ATC-62
TROUBLE DIAGNOSIS
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
SYMPTOM: Mode door motor does not operate normally.
Perform diagnostic procedure for LAN system circuit. Refer to AT C - 5 7 , "
LAN System Circuit" .
RJIA0774E
RJIA0775E

TROUBLE DIAGNOSIS
ATC-63
C
D
E
F
G
H
I
K
L
MA
B
AT C
Air Mix Door Motor CircuitEJS001ZM
SYMPTOM:
●Discharge air temperature does not change.
●Air mix door motor does not operate.
INSPECTION FLOW
*1AT C - 4 2 , "Self-diagnosis Function",
see No.1*2ATC-100, "Ambient Sensor Circuit"*3ATC-102, "In-vehicle Sensor Circuit"
*4ATC-105, "Sunload Sensor Circuit"*5AT C - 6 3 , "Air Mix Door Motor Cir-
cuit"
*6AT C - 4 2 , "Self-diagnosis Function",
see No. 14.
*7AT C - 5 7 , "
LAN System Circuit"*8AT C - 5 1 , "Operational Check"*9AT C - 5 1 , "Operational Check"
*10AT C - 2 9 , "SYMPTOM TABLE"*11ATC-108, "Intake Sensor Circuit"*12AT C - 4 2 , "Self-diagnosis Function",
see No. 7
RJIA1694E

ATC-64
TROUBLE DIAGNOSIS
SYSTEM DESCRIPTION
Component Parts
Air mix door control system components are:
●Auto amp.
●Air mix 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 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
RJIA0777E
RHA457H

TROUBLE DIAGNOSIS
ATC-65
C
D
E
F
G
H
I
K
L
MA
B
AT C
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. 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-57, "
LAN System Circuit" .
RJIA0774E
RJIA0775E

ATC-66
TROUBLE DIAGNOSIS
Intake Door Motor Circuit
EJS001ZN
SYMPTOM:
●Intake door does not change.
●Intake door motor does not operate normally.
INSPECTION FLOW
*1 AT C - 4 2 , "Self-diagnosis Function" ,
see No.1*2ATC-100, "Ambient Sensor Circuit"*3AT C - 1 0 2 , "In-vehicle Sensor Circuit"
*4ATC-105, "Sunload Sensor Circuit"*5ATC-63, "Air Mix Door Motor Circuit"*6AT C - 4 2 , "Self-diagnosis Function",
see No. 14.
*7AT C - 5 7 , "
LAN System Circuit"*8ATC-67, "COMPONENT DESCRIP-
TION"
*9AT C - 5 1 , "Operational Check"
RJIA1695E

TROUBLE DIAGNOSIS
ATC-67
C
D
E
F
G
H
I
K
L
MA
B
AT C
SYSTEM DESCRIPTION
Component Parts
Intake door control system components are:
●Auto amp.
●Intake 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 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.
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 amplifier. Motor rotation is
conveyed to a lever which activates the intake door.
*10AT C - 4 2 , "Self-diagnosis Function",
see No.5 or 7*11AT C - 5 1 , "Operational Check"*12AT C - 2 9 , "SYMPTOM TABLE"
*13ATC-108, "Intake Sensor Circuit"
RJIA0781E
RJIA0782E

ATC-68
TROUBLE DIAGNOSIS
DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR
SYMPTOM: Intake door motor does not operate normally.
Perform diagnostic procedure for LAN system circuit. Refer to AT C - 5 7 , "
LAN System Circuit" .
RJIA0783E

TROUBLE DIAGNOSIS
ATC-69
C
D
E
F
G
H
I
K
L
MA
B
AT C
Blower Motor CircuitEJS001ZO
SYMPTOM:
●Blower motor operation is malfunctioning.
●Blower motor operation is malfunctioning under out of starting fan speed control.
INSPECTION FLOW
RJIA1696E

ATC-70
TROUBLE DIAGNOSIS
SYSTEM DESCRIPTION
Component Parts
Fan speed control system components are:
●Auto amp.
●A/C LAN system (PBR built-in air mix door motor, mode door motor and intake door motor)
●Fan control amp.
●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 automatic amplifier based on input from
the PBR, in-vehicle sensor, sunload sensor, intake sensor and ambient sensor.
The blower motor applied voltage ranges from approximately 4 volts (lowest speed) to 12 volts (highest
speed).
The control blower speed (in the range of 4 to 12V), the automatic amplifier supplies a gate voltage to the fan
control amplifier. Based on this voltage, the fan control amplifier controls the voltage supplied to the blower
motor.
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.
*1AT C - 4 2 , "Self-diagnosis Function"*2AT C - 4 2 , "Self-diagnosis Function",
see No.14.*3AT C - 6 9 , "Blower Motor Circuit"
*4AT C - 5 1 , "Operational Check"*5AT C - 2 9 , "SYMPTOM TABLE"*6 QG engine (With EURO–OBD): EC-
144, "DTC P0117, P0118 ECT SEN-
SOR"
QG engine (Without EURO–OBD):
EC-501, "
DTC P0117, P0118 ECT
SENSOR"
YD engine: EC-84, "DTC 0115
COOLANT TEMP SEN"
RJIA0785E