Page 60 of 142
ATC-60
TROUBLE DIAGNOSIS
Revision: 2006 November2007 350Z
Mode Door Motor CircuitNJS00010
SYMPTOM
Air outlet does not change.
Mode door motor does not operate normally.
INSPECTION FLOW
*1AT C - 3 0 , "Discharge Air Flow"*2ATC-53, "Operational Check"*3ATC-46, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 1.
*4AT C - 4 6 , "
FUNCTION CONFIRMA-
TION PROCEDURE", see No. 5 to 7.*5ATC-92, "
Ambient Sensor Circuit"*6ATC-94, "In-vehicle Sensor Circuit"
*7AT C - 9 7 , "Sunload Sensor Circuit"*8ATC-65, "Air Mix Door Motor PBR
Circuit"
*9ATC-46, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 9.
SJIA1850E
Page 61 of 142
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
Page 63 of 142
TROUBLE DIAGNOSIS
ATC-63
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AT C
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
Page 64 of 142
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
Page 66 of 142
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
Page 67 of 142
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
Page 69 of 142
TROUBLE DIAGNOSIS
ATC-69
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AT C
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
Page 70 of 142
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
