sensor INFINITI FX35 2007 Service Manual

ATC-62
TROUBLE DIAGNOSIS
Revision: 2006 July 2007 FX35/FX45
Power Supply and Ground Circuit for Auto Amp.NJS000E2
SYMPTOM: A/C system does not come on.
INSPECTION FLOW
COMPONENT DESCRIPTION
Unified Meter and A/C Amp. (Automatic Amplifier)
The unified meter and A/C amp. has a built-in microcomputer which
processes information sent from various sensors needed for air con-
ditioner operation. The air mix door motor, mode door motor, intake
door motor, blower motor and compressor are then controlled.
When the various switches and temperature control switch are oper-
ated, data is input to the unified meter and A/C amp. from the display
control unit using CAN communication.
Self-diagnosis functions are also built into unified meter and A/C
amp. to provide quick check of malfunctions in the auto air condi-
tioner system.
*1 ATC-63, "DIAGNOSIS PROCE-
DURE FOR A/C SYSTEM"
*2 ATC-60, "Operational Check"*3AV-84, "Unable to Operate System
with A/C and AV Switch" (Without
navigation system) or AV-139,
"Unable to Operate System with A/C
and AV Switch" (With navigation
system)
SJIA1582E
SJIA1566E

ATC-68
TROUBLE DIAGNOSIS
Revision: 2006 July 2007 FX35/FX45
Mode Door Motor CircuitNJS000E4
SYMPTOM

Air outlet does not change.

Mode door motor does not operate normally.
INSPECTION FLOW
*1AT C - 3 7 , "Discharge Air Flow"*2ATC-60, "Operational Check"*3ATC-53, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 4 to
6.
*4 ATC-103, "
Ambient Sensor Circuit"*5ATC-106, "In-vehicle Sensor Cir-
cuit"
*6ATC-109, "Sunload Sensor Circuit"
*7 AT C - 11 2 , "Intake Sensor Circuit"*8ATC-71, "Air Mix Door Motor Cir-
cuit"
*9ATC-53, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 13.
*10 AT C - 6 4 , "
DIAGNOSIS PROCE-
DURE FOR LAN CIRCUIT"
*11ATC-130, "MODE DOOR MOTOR"*12ATC-41, "SYMPTOM TABLE"
SJIA1806E

TROUBLE DIAGNOSIS ATC-69
C
D E
F
G H
I
K L
M A
B
AT C
Revision: 2006 July 2007 FX35/FX45
SYSTEM DESCRIPTION
Component Parts
Mode door control system components are:

Unified meter and A/C amp.

Mode 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 unified meter and A/C amp. receives data from each of the sensors. The unified meter and A/C amp.
sends air mix door, mode door and intake door opening angle data to the air mix door motor LCUs, mode door
motor LCU and intake door motor LCU.
The air mix door motors, mode door motor and intake door motor read their respective signals according to the
address signal. Opening angle indication signals received from the unified meter and A/C amp. and each of
the motor position sensors are compared by the LCUs in each door motor with the existing decision and open-
ing angles. Subsequently, HOT/COLD, DEF/VENT and FRE/REC operation is selected. The new selection
data are returned to the unified meter and A/C amp.
SJIA1585E

TROUBLE DIAGNOSIS ATC-71
C
D E
F
G H
I
K L
M A
B
AT C
Revision: 2006 July 2007 FX35/FX45
Air Mix Door Motor CircuitNJS000E5
SYMPTOM

Discharge air temperature does not change.

Air mix door motor does not operate normally.
INSPECTION FLOW
*1ATC-53, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 4 to 6. *2
ATC-103, "
Ambient Sensor Circuit"*3 ATC-106, "In-vehicle Sensor Circuit"
*4ATC-109, "Sunload Sensor Circuit"*5ATC-71, "Air Mix Door Motor Circuit"*6 ATC-53, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 13.
*7 ATC-64, "
LAN System Circuit".*8 ATC-60, "Operational Check"*9ATC-41, "SYMPTOM TABLE"
*10ATC-112, "Intake Sensor Circuit"
SJIA1586E

ATC-72
TROUBLE DIAGNOSIS
Revision: 2006 July 2007 FX35/FX45
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 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 unified meter and A/C amp. receives data from each of the sensors. The unified meter and A/C amp.
sends air mix door, mode door and intake door motor opening angle data to the air mix door motor LCUs,
mode door motor LCU and intake door motor LCU.
The air mix door motors, mode door motor and intake door motor read their respective signals according to the
address signal. Opening angle indication signals received from the unified meter and A/C amp. and each of
the motor position sensors are compared by the LCUs in each door motor with the existing decision and open-
ing angles. Subsequently, HOT/COLD, DEF/VENT and FRE/REC operation is selected. The new selection
data are returned to the unified meter and A/C amp.
Air Mix Door Control Specification
RJIA1781E
RJIA1782E

ATC-74
TROUBLE DIAGNOSIS
Revision: 2006 July 2007 FX35/FX45
Intake Door Motor CircuitNJS000E7
SYMPTOM

Intake door does not change.

Intake door motor does not operate normally.
INSPECTION FLOW
*1AT C - 6 0 , "Operational Check"*2AT C - 5 3 , "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 4 to
6. *3
ATC-103, "
Ambient Sensor Circuit"
*4 ATC-106, "In-vehicle Sensor Circuit"*5ATC-109, "Sunload Sensor Circuit"*6 AT C - 11 2 , "Intake Sensor Circuit"
*7 AT C - 7 1 , "Air Mix Door Motor Circuit"*8AT C - 4 1 , "SYMPTOM TABLE"*9 AT C - 5 3 , "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 13.
*10 AT C - 6 4 , "
LAN System Circuit"*11ATC-123, "INTAKE DOOR MOTOR"
SJIA1807E

TROUBLE DIAGNOSIS ATC-75
C
D E
F
G H
I
K L
M A
B
AT C
Revision: 2006 July 2007 FX35/FX45
SYSTEM DESCRIPTION
Component Parts
Intake door control system components are:

Unified meter and A/C 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, or OFF switches are pressed or A/C switch is OFF,
the unified meter and A/C amp. sets the intake door at the FRE position.
Intake Door Control Specification
SJIA1588E
RJIA1787E

TROUBLE DIAGNOSIS ATC-77
C
D E
F
G H
I
K L
M A
B
AT C
Revision: 2006 July 2007 FX35/FX45
Blower Motor CircuitNJS000E8
SYMPTOM: Blower motor operation is malfunctioning.
INSPECTION FLOW
*1ATC-60, "Operational Check"*2AT C - 5 3 , "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 4. *3
ATC-53, "
FUNCTION CONFIRMA-
TION PROCEDURE", see No. 6.
*4 ATC-103, "
Ambient Sensor Circuit"*5ATC-106, "In-vehicle Sensor Circuit"*6ATC-109, "Sunload Sensor Circuit"
*7 ATC-112, "Intake Sensor Circuit"*8AT C - 4 1 , "SYMPTOM TABLE"*9ATC-53, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 13.
*10 ATC-79, "
DIAGNOSIS PROCE-
DURE FOR BLOWER MOTOR"
*11EC-209, "DTC P0117, P0118 ECT
SENSOR" (VQ35DE) or EC-880,
"DTC P0117, P0118 ECT SEN-
SOR" (VK45DE)
SJIA1808E

ATC-78
TROUBLE DIAGNOSIS
Revision: 2006 July 2007 FX35/FX45
SYSTEM DESCRIPTION
Component Parts
Fan speed control system components are:

Unified meter and A/C 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 unified meter and A/C 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.
RJIA1995E

ATC-82
TROUBLE DIAGNOSIS
Revision: 2006 July 2007 FX35/FX45
Magnet Clutch CircuitNJS000E9
SYMPTOM: Magnet clutch does not engage.
INSPECTION FLOW
*1ATC-112, "Intake Sensor Circuit"*2 ATC-103, "Ambient Sensor Circuit"*3AT C - 5 3 , "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 13.
*4 ATC-83, "
DIAGNOSIS PROCE-
DURE FOR MAGNET CLUTCH"
*5 ATC-95, "TROUBLE DIAGNOSIS
FOR UNUSUAL PRESSURE"
*6AT C - 6 0 , "Operational Check"
*7ATC-53, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 4 to 6. *8
ATC-41, "
SYMPTOM TABLE"
SJIA1590E