NISSAN 350Z 2007 Z33 Automatic Air Conditioner Repair Manual

TROUBLE DIAGNOSIS
ATC-61
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AT C
Revision: 2006 November2007 350Z
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 FRE/REC operation is selected. The new selection
data are returned to the unified meter and A/C amp.
Mode Door Control Specification
*10ATC-56, "DIAGNOSIS PROCE-
DURE FOR LAN CIRCUIT"
*11AT C - 11 6 , "MODE DOOR MOTOR"*12AT C - 3 4 , "SYMPTOM TABLE"
*13ATC-100, "Intake Sensor Circuit"
RJIA1380E
RJIA1778E

ATC-62
TROUBLE DIAGNOSIS
Revision: 2006 November2007 350Z
COMPONENT DESCRIPTION
Mode Door Motor
The mode door motor is attached to the heater & cooling unit assem-
bly. It rotates so that air is discharged from the outlet set by the uni-
fied meter and A/C amp. Motor rotation is conveyed to a link which
activates the mode door.
DIAGNOSIS PROCEDURE FOR MODE DOOR MOTOR
SYMPTOM: Mode door motor does not operate normally.
Perform diagnosis procedure. Refer to AT C - 5 6 , "
DIAGNOSIS PROCEDURE FOR LAN CIRCUIT" .
RJIA0890E

TROUBLE DIAGNOSIS
ATC-63
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Revision: 2006 November2007 350Z
Air Mix Door Motor CircuitNJS00011
SYMPTOM

Discharge air temperature does not change.

Air mix door motor does not operate normally.
INSPECTION FLOW
*1ATC-46, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 1.*2ATC-92, "
Ambient Sensor Circuit"*3ATC-94, "In-vehicle Sensor Circuit"
*4ATC-97, "Sunload Sensor Circuit"*5ATC-65, "Air Mix Door Motor PBR
Circuit"
*6ATC-46, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 9.
*7ATC-56, "
LAN System Circuit"*8ATC-65, "Air Mix Door Motor"*9ATC-53, "Operational Check"
*10ATC-34, "SYMPTOM TABLE"*11ATC-100, "Intake Sensor Circuit"*12ATC-46, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 5 to
7.
SJIA1126E

ATC-64
TROUBLE DIAGNOSIS
Revision: 2006 November2007 350Z
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 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 FRE/REC operation is selected. The new selection
data are returned to the unified meter and A/C amp.
Air Mix Door Control Specification
RJIA1382E
RJIA1782E

TROUBLE DIAGNOSIS
ATC-65
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Revision: 2006 November2007 350Z
COMPONENT DESCRIPTION
Air Mix Door Motor
The air mix door motor is attached to the heater & cooling unit
assembly. It rotates so that the air mix door is opened or closed to a
position set by the unified meter and A/C amp. Motor rotation is then
sent conveyed through a shaft and the air mix door position feed-
back is then sent to the unified meter and A/C amp. by PBR built-in
air mix door motor.
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR
SYMPTOM: Discharge air temperature does not change.
Perform diagnosis procedure. Refer to AT C - 5 6 , "
DIAGNOSIS PROCEDURE FOR LAN CIRCUIT" .
Air Mix Door Motor PBR CircuitNJS00012
SYMPTOM

Discharge air temperature does not change.

PBR circuit is open or shorted.
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR MOTOR PBR
Perform diagnosis procedure. Refer to AT C - 5 6 , "DIAGNOSIS PROCEDURE FOR LAN CIRCUIT" .
RJIA1383E

ATC-66
TROUBLE DIAGNOSIS
Revision: 2006 November2007 350Z
Intake Door Motor CircuitNJS00013
SYMPTOM

Intake door does not change.

Intake door motor does not operate normally.
INSPECTION FLOW
*1ATC-46, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 1.*2ATC-92, "
Ambient Sensor Circuit"*3AT C - 9 4 , "In-vehicle Sensor Circuit"
*4ATC-97, "Sunload Sensor Circuit"*5ATC-65, "Air Mix Door Motor PBR
Circuit"
*6AT C - 4 6 , "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 9.
*7ATC-56, "
LAN System Circuit"*8AT C - 111 , "INTAKE DOOR MOTOR"*9AT C - 5 3 , "Operational Check"
*10ATC-46, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 5 to 7.*11ATC-34, "
SYMPTOM TABLE"*12ATC-100, "Intake Sensor Circuit"
SJIA1127E

TROUBLE DIAGNOSIS
ATC-67
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AT C
Revision: 2006 November2007 350Z
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 setting mode control dial to D/F, D/F2 or DEF position, fan con-
trol dial OFF position, the unified meter and A/C amp. sets the intake door at the FRE position.
Intake Door Control Specification
RJIA1385E
RJIA1787E

ATC-68
TROUBLE DIAGNOSIS
Revision: 2006 November2007 350Z
COMPONENT DESCRIPTION
Intake Door Motor
The intake door motor is attached to the blower unit. It rotates so that
air is drawn from inlets set by the unified meter and A/C amp. Motor
rotation is conveyed to a lever which activates the intake door.
DIAGNOSIS PROCEDURE FOR INTAKE DOOR MOTOR
SYMPTOM: Intake door motor does not operate normally.
Perform diagnosis procedure. Refer to AT C - 5 6 , "
DIAGNOSIS PROCEDURE FOR LAN CIRCUIT" .
RJIA1386E

TROUBLE DIAGNOSIS
ATC-69
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Revision: 2006 November2007 350Z
Blower Motor CircuitNJS00014
SYMPTOM: Blower motor operation is malfunctioning.
INSPECTION FLOW
*1ATC-53, "Operational Check"*2AT C - 4 6 , "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 1.*3ATC-46, "
FUNCTION CONFIRMA-
TION PROCEDURE", see No. 5.
*4ATC-46, "
FUNCTION CONFIRMA-
TION PROCEDURE", see No. 7.*5AT C - 4 6 , "
FUNCTION CONFIRMA-
TION PROCEDURE", see No. 9.*6ATC-71, "
DIAGNOSIS PROCE-
DURE FOR BLOWER MOTOR"
*7ATC-34, "SYMPTOM TABLE"*8AT C - 9 2 , "Ambient Sensor Circuit"*9ATC-94, "In-vehicle Sensor Circuit"
*10ATC-97, "Sunload Sensor Circuit"*11ATC-100, "Intake Sensor Circuit"*12EC-223, "DTC P0117, P0118 ECT
SENSOR"
SJIA1128E

ATC-70
TROUBLE DIAGNOSIS
Revision: 2006 November2007 350Z
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 motor’s drive signal is changed at 8%/sec. to pre-
vent 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.
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 low 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 fan control dial to AUTO position. The blower speed will
gradually rise to the objective speed over a time period of 3 seconds or less (actual time depends on the
objective blower speed).
RJIA1388E