sensor INFINITI FX35 2005 Service Manual

TROUBLE DIAGNOSIS ATC-57
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AT C
Revision: 2005 July 2005 FX
12. CHECK CAN COMMUNICATION ERROR
1. Press (REC) switch.
2. CAN communication error between unified meter and A/C amp. and display unit or display control unit is detected.
OK or NG
OK >> 1. Turn ignition switch OFF or AUTO switch ON. 2. INSPECTION END
NG >> Go to CAN communication. Refer to BCS-15, "
CAN
Communication Inspection Using CONSULT-II (Self-
Diagnosis)" .

Unified meter and A/C amp. - Display unit

Unified meter and A/C amp. - Display control unit
13. CHECK MALFUNCTIONING SENSOR
Refer to the following chart for malfunctioning code No.
(If two or more sensors malfunction, corresponding code Nos. blink respectively twice.)
*1: Perform self-diagnosis STEP-2 under sunshine.
When performing indoors, aim a light (more than 60 W) at sunload sensor, otherwise code No. 25 will indicate
despite that sunload sensor is functioning properly.
*2: ATC-104, "
DIAGNOSIS PROCEDURE FOR AMBIENT SENSOR" .
*3: ATC-108, "
DIAGNOSIS PROCEDURE FOR IN-VEHICLE SENSOR" .
*4: AT C - 11 3 , "
DIAGNOSIS PROCEDURE FOR INTAKE SENSOR" .
*5: AT C - 11 0 , "
DIAGNOSIS PROCEDURE FOR SUNLOAD SENSOR" .
*6: AT C - 7 5 , "
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR MOTOR PBR" .
>> INSPECTION END
RJIA1969E
Code No. Malfunctioning sensor (Including circuits) Reference page 21 / −21 Ambient sensor *2
22 / −22 In-vehicle sensor *3
24 / −24 Intake sensor *4
25 / −25
Sunload sensor *
1*5
26 / −26 Air mix door motor PBR (Driver side)
*6
27 / −27 Air mix door motor PBR (Passenger side)
RJIA0227E

ATC-64
TROUBLE DIAGNOSIS
Revision: 2005 July 2005 FX
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 switch are operated,
data is input to the unified meter and A/C amp. from the display unit/
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.
Potentio Temperature Control (PTC)
The PTC is built into the A/C and AV switch. It can be set at an inter-
val of 0.5 °C (1.0 °F) in the 18 °C (60 °F) to 32 °C (90 °F) temperature
range by pressing temperature switch. The set temperature is dis-
played.
DIAGNOSIS PROCEDURE FOR A/C SYSTEM
SYMPTOM: A/C system does not come on.
RJIA1965E
RJIA1982E
RJIA1983E

ATC-70
TROUBLE DIAGNOSIS
Revision: 2005 July 2005 FX
Mode Door Motor CircuitAJS0014T
SYMPTOM:

Air outlet does not change.

Mode door motor does not operate normally.
INSPECTION FLOW
*1AT C - 3 7 , "Discharge Air Flow"*2ATC-61, "Operational Check"*3ATC-113, "Intake Sensor Circuit"
*4 AT C - 5 4 , "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 4 to 6. *5
ATC-104, "
Ambient Sensor Circuit"*6ATC-107, "In-vehicle Sensor Circuit"
*7 AT C - 11 0 , "Sunload Sensor Circuit"*8ATC-73, "Air Mix Door Motor Cir-
cuit"
*9ATC-54, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 13.
*10 AT C - 6 6 , "
DIAGNOSIS PROCE-
DURE FOR LAN CIRCUIT"
*11ATC-131, "MODE DOOR MOTOR"*12ATC-42, "SYMPTOM TABLE"
RJIA1991E

TROUBLE DIAGNOSIS ATC-71
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Revision: 2005 July 2005 FX
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 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 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 FRESH/RECIRCULATION operation is selected. The
new selection data are returned to the unified meter and A/C amp.
RJIA1777E

TROUBLE DIAGNOSIS ATC-73
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AT C
Revision: 2005 July 2005 FX
Air Mix Door Motor CircuitAJS0014U
SYMPTOM:

Discharge air temperature does not change.

Air mix door motor does not operate normally.
INSPECTION FLOW
*1ATC-54, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 4 to 6. *2
ATC-104, "
Ambient Sensor Circuit"*3 ATC-107, "In-vehicle Sensor Circuit"
*4ATC-110, "Sunload Sensor Circuit"*5ATC-73, "Air Mix Door Motor Circuit"*6 ATC-54, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 13.
*7 ATC-66, "
LAN System Circuit".*8 ATC-61, "Operational Check"*9ATC-42, "SYMPTOM TABLE"
*10ATC-113, "Intake Sensor Circuit"
SJIA0546E

ATC-74
TROUBLE DIAGNOSIS
Revision: 2005 July 2005 FX
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 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 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 FRESH/RECIRCULATION 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-76
TROUBLE DIAGNOSIS
Revision: 2005 July 2005 FX
Intake Door Motor CircuitAJS0014W
SYMPTOM:

Intake door does not change.

Intake door motor does not operate normally.
INSPECTION FLOW
*1AT C - 5 4 , "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 4 to 6. *2
ATC-104, "
Ambient Sensor Circuit"*3 ATC-107, "In-vehicle Sensor Circuit"
*4 AT C - 11 0 , "Sunload Sensor Circuit"*5AT C - 7 3 , "Air Mix Door Motor Circuit"*6 AT C - 5 4 , "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 13.
*7 AT C - 6 6 , "
LAN System Circuit"*8ATC-124, "INTAKE DOOR MOTOR"*9 AT C - 6 1 , "Operational Check"
*10 AT C - 4 2 , "SYMPTOM TABLE"*11AT C - 11 3 , "Intake Sensor Circuit"
RJIA1993E

TROUBLE DIAGNOSIS ATC-77
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Revision: 2005 July 2005 FX
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 FRESH position.
Intake Door Control Specification
RJIA1786E
RJIA1787E

TROUBLE DIAGNOSIS ATC-79
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Revision: 2005 July 2005 FX
Blower Motor CircuitAJS0014X
SYMPTOM: Blower motor operation is malfunctioning.
INSPECTION FLOW
*1ATC-61, "Operational Check"*2AT C - 11 3 , "Intake Sensor Circuit"*3ATC-54, "FUNCTION CONFIRMA-
TION PROCEDURE", see No.4.
*4 ATC-54, "
FUNCTION CONFIRMA-
TION PROCEDURE", see No.6. *5
AT C - 5 4 , "
FUNCTION CONFIRMA-
TION PROCEDURE", see No.13. *6
ATC-81, "
DIAGNOSIS PROCE-
DURE FOR BLOWER MOTOR"
*7 ATC-42, "SYMPTOM TABLE"*8ATC-104, "Ambient Sensor Circuit"*9ATC-107, "In-vehicle Sensor Circuit"
*10 ATC-110, "Sunload Sensor Circuit"*11EC-208, "DTC P0117, P0118 ECT
SENSOR" (VQ35DE) or EC-914,
"DTC P0117, P0118 ECT SEN-
SOR" (VK45DE)
RJIA1994E

ATC-80
TROUBLE DIAGNOSIS
Revision: 2005 July 2005 FX
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