2007 NISSAN 350Z Automatic Air Conditioner Workshop Manual

TROUBLE DIAGNOSIS
ATC-65
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AT C
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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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

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

TROUBLE DIAGNOSIS
ATC-71
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AT C
Revision: 2006 November2007 350Z
Blower Speed Compensation
Sunload
When the in-vehicle temperature and the set temperature are very close, the blower will be operating at low
speed. The low speed will vary depending on the sunload. During conditions of low or no sunload, the blower
speed is at duty ratio 25%. During high sunload conditions, the unified meter and A/C amp. raise the blower
speed.(duty ratio 49%).
Fan Speed Control Specification
COMPONENT DESCRIPTION
Brush-less Motor
The blower motor utilizes a brush-less motor with a rotating magnet.
Quietness is improved over previous motors where the brush was
the point of contact and the coil rotated.
DIAGNOSIS PROCEDURE FOR BLOWER MOTOR
SYMPTOM: Blower motor operation is malfunctioning.
RJIA1996E
ZHA152H
SJIA0266E

ATC-72
TROUBLE DIAGNOSIS
Revision: 2006 November2007 350Z
1. CHECK POWER SUPPLY FOR BLOWER MOTOR
1. Disconnect blower motor connector.
2. Turn ignition switch ON.
3. Check voltage between blower motor harness connector M62
terminal 1 and ground.
OK or NG
OK >> GO TO 2.
NG >> Check power supply circuit and 15A fuses [Nos. 10 and
11, located in the fuse block (J/B)]. Refer to PG-85,
"FUSE BLOCK - JUNCTION BOX (J/B)" .

If fuse are OK, check harness for open circuit. Repair or replace if necessary.

If fuse are NG, check harness for short circuit and replace fuse.
2. CHECK GROUND CIRCUIT FOR BLOWER MOTOR
1. Turn ignition switch OFF.
2. Check continuity between blower motor harness connector M62
terminal 3 and ground.
OK or NG
OK >> GO TO 3.
NG >> Repair harness or connector.
3. CHECK CIRCUIT CONTINUITY BETWEEN BLOWER MOTOR AND UNIFIED METER AND A/C AMP.
1. Disconnect unified meter connector and A/C amp. connector.
2. Check continuity between blower motor harness connector M62
terminal 2 and unified meter and A/C amp. harness connector
M50 terminal 53.
OK or NG
OK >> GO TO 4.
NG >> Repair harness or connector.1 – Ground : Battery voltage
RJIA1997E
3 – Ground : Continuity should exist.
RJIA1998E
2 – 53 : Continuity should exist.
RJIA1999E