ECO mode NISSAN 350Z 2007 Z33 Automatic Air Conditioner Workshop Manual

ATC-1
AUTOMATIC AIR CONDITIONER
J AIR CONDITIONER
CONTENTS
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Revision: 2006 November2007 350Z
AUTOMATIC AIR CONDITIONER
PRECAUTIONS .......................................................... 4
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 4
Precautions for Battery Service ................................ 4
Precautions for Procedures without Cowl Top Cover ..... 4
Precautions for Working with HFC-134a (R-134a) ..... 5
CONTAMINATED REFRIGERANT ....................... 5
General Refrigerant Precautions .............................. 6
Precautions for Refrigerant Connection ................... 7
ABOUT ONE-TOUCH JOINT ................................ 7
FEATURES OF NEW TYPE REFRIGERANT
CONNECTION ...................................................... 9
O-RING AND REFRIGERANT CONNECTION ... 10
Precautions for Servicing Compressor ................... 12
Precautions for Service Equipment ........................ 12
RECOVERY/RECYCLING EQUIPMENT ............ 12
ELECTRICAL LEAK DETECTOR ....................... 12
VACUUM PUMP ................................................. 12
MANIFOLD GAUGE SET .................................... 12
SERVICE HOSES ............................................... 13
SERVICE COUPLERS ........................................ 13
REFRIGERANT WEIGHT SCALE ...................... 13
CHARGING CYLINDER ...................................... 13
Precautions for Leak Detection Dye ....................... 14
IDENTIFICATION ................................................ 14
IDENTIFICATION LABEL FOR VEHICLE ........... 14
PREPARATION ......................................................... 15
Special Service Tools ............................................. 15
HFC-134a (R-134a) Service Tools and Equipment ... 16
Commercial Service Tools ...................................... 18
REFRIGERATION SYSTEM ..................................... 19
Refrigerant Cycle ................................................... 19
REFRIGERANT FLOW ....................................... 19
FREEZE PROTECTION ..................................... 19
Refrigerant System Protection ............................... 19
REFRIGERANT PRESSURE SENSOR ............. 19
PRESSURE RELIEF VALVE ............................... 19
Component Layout ................................................. 20LUBRICANT .............................................................. 21
Maintenance of Lubricant Quantity in Compressor ... 21
LUBRICANT ........................................................ 21
LUBRICANT RETURN OPERATION .................. 21
LUBRICANT ADJUSTING PROCEDURE FOR
COMPONENTS REPLACEMENT EXCEPT
COMPRESSOR .................................................. 22
LUBRICANT ADJUSTING PROCEDURE FOR
COMPRESSOR REPLACEMENT ....................... 23
AIR CONDITIONER CONTROL ............................... 24
Description of Air Conditioner LAN Control System ... 24
System Construction .............................................. 24
OPERATION ........................................................ 25
TRANSMISSION DATA AND TRANSMISSION
ORDER ............................................................... 25
AIR MIX DOOR CONTROL (AUTOMATIC TEM-
PERATURE CONTROL) ..................................... 26
FAN SPEED CONTROL ...................................... 26
INTAKE DOOR CONTROL ................................. 26
MODE DOOR CONTROL ................................... 26
MAGNET CLUTCH CONTROL ........................... 27
SELF-DIAGNOSIS SYSTEM .............................. 27
Description of Control System ................................ 28
Control Operation ................................................... 29
MODE CONTROL DIAL ...................................... 29
TEMPERATURE CONTROL DIAL (POTENTIO
TEMPERATURE CONTROL) .............................. 29
FAN CONTROL DIAL .......................................... 29
REAR WINDOW DEFOGGER SWITCH ............. 29
INTAKE SWITCH ................................................. 29
A/C SWITCH ....................................................... 29
Discharge Air Flow ................................................. 30
System Description ................................................. 31
SWITCHES AND THEIR CONTROL FUNCTION ... 31
CAN Communication System Description .............. 32
TROUBLE DIAGNOSIS ............................................ 33
CONSULT-III Function (BCM) ................................ 33
DATA MONITOR ................................................. 33
How to Perform Trouble Diagnosis for Quick and
Accurate Repair ...................................................... 34

AIR CONDITIONER CONTROL
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Control OperationNJS0000M
MODE CONTROL DIAL
The air discharge outlets are controlled with this dial.
Mode doors are set to the defrost position with this dial. Also, intake doors are set to the outside air position.
When shifting mode control dial to D/F, D/F2 or DEF position under the following conditions, compressor is
turned ON. (A/C LED ON)

FAN: O N

A/C: OFF
TEMPERATURE CONTROL DIAL (POTENTIO TEMPERATURE CONTROL)
The set temperature is increased or decreased with this dial.
FAN CONTROL DIAL
The blower speed is automatically or manually controlled with this dial. Twenty-five speeds are available for
manual control.
Shifting fan control dial to AUTO, compressor is turned ON automatically.
REAR WINDOW DEFOGGER SWITCH
When illumination is ON, rear window is defogged.
INTAKE SWITCH

When intake switch is ON, REC LED turns ON, and air inlet is fixed to REC.

When press intake switch again, FRE LED turns ON, and air inlet is fixed to FRE.

When intake switch is pressed for approximately 1.5 seconds or longer, REC and FRE LEDs blink twice.
Then, automatic control mode is entered. Inlet status is displayed even during automatic control.

When FRE LED is turned ON, shifting mode control dial to D/F, D/F2 or DEF, or when compressor is
turned from ON to OFF, intake switch is automatically turned OFF (fixed to FRE mode). REC mode can be
re-entered by pressing intake switch again, and then compressor is turned ON. (Except D/F, D/F2 or DEF
position)
A/C SWITCH
Compressor is ON or OFF with this switch.
(Pressing the A/C switch when the fan control dial is ON, will turn OFF the A/C switch and compressor.)
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ATC-46
TROUBLE DIAGNOSIS
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FUNCTION CONFIRMATION PROCEDURE
1. SET IN SELF-DIAGNOSIS MODE (STEP-1 TO 4)
1. Set the fan control dial to OFF position.
2. Turn ignition switch ON.
3. Set in self-diagnosis mode as follows. Within 10 seconds after starting engine (ignition switch is turned
ON.), press A/C switch for at least 5 seconds.
NOTE:
If battery voltage drops below 12 V during diagnosis STEP-3, door motor speed becomes slower and as a
result, the system may generate an error even when operation is normal. To avoid this, start engine before
performing this diagnosis.
>> GO TO 2.
2. STEP-1: LEDS ARE CHECKED
Check intake and A/C switch LEDs illumination.
OK >> GO TO 3.
NG >> Refer to AT C - 9 1 , "
Self-diagnosis" .
3. CHECK TO ADVANCE SELF-DIAGNOSIS STEP-2
1. Turn fan control dial to AUTO position.
NOTE:
When switched to STEP-2, LED of REC position blinks for
approximately 25 seconds.
2. Check A/C switch LED illumination.
Advance to self
-diagnosis STEP-2?
YES >> GO TO 4.
NO >> Replace A/C controller. (Fan control dial is malfunction-
ing.)
4. CHECK TO RETURN SELF-DIAGNOSIS STEP-1
Turn fan control dial to OFF position.
Return to self
-diagnosis STEP-1?
YES >> GO TO 5.
NO >> Replace A/C controller. (Fan control dial is malfunctioning.)
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TROUBLE DIAGNOSIS
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5. STEP-2: SENSOR CIRCUITS ARE CHECKED FOR OPEN OR SHORT CIRCUIT
1. Turn fan control dial to AUTO position.
2. Turn mode control dial to AUTO position.
NOTE:
When switched to STEP-2, LED of REC position blinks for
approximately 25 seconds.
3. Check A/C switch LED is illuminate.
OK or NG
OK >> GO TO 6.
NG >> GO TO 9.
6. STEP-3: MODE DOOR AND INTAKE DOOR POSITIONS ARE CHECKED
1. Turn fan control dial to 1st - 12th speed.
NOTE:
When switched to STEP-3, LED of REC position blinks for
approximately 50 seconds.
2. Check A/C switch LED is illuminate.
OK or NG
OK >> GO TO 7.
NG >> GO TO 10.
7. STEP-4: OPERATION OF EACH ACTUATOR IS CHECKED
1. Turn fan control dial to 13th - 25th speed.
2. Change operation status of air conditioner by changing mode
control dial position.
>> GO TO 8.
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TROUBLE DIAGNOSIS
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9. CHECK MALFUNCTIONING SENSOR AND DOOR MOTOR
Refer to the following chart.
*1: Perform self-diagnosis STEP-2 under sunshine.
When performing indoors, aim a light (more than 60 W) at sunload
sensor, otherwise LED of A/C switch will not indicate despite that
sunload sensor is functioning properly.
NOTE:
When switched to STEP-2, LED of REC position blinks for approxi-
mately 25 seconds.
*2: AT C - 9 2 , "
DIAGNOSIS PROCEDURE FOR AMBIENT SENSOR" .
*3: AT C - 9 5 , "
DIAGNOSIS PROCEDURE FOR IN-VEHICLE SENSOR" .
*4: AT C - 9 7 , "
DIAGNOSIS PROCEDURE FOR SUNLOAD SENSOR" .
*5: ATC-100, "
DIAGNOSIS PROCEDURE FOR INTAKE SENSOR" .
*6: AT C - 6 5 , "
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR MOTOR PBR" .
>> INSPECTION END
10. CHECK MALFUNCTIONING DOOR MOTOR POSITION SWITCH
Mode and/or intake door motor PBR(s) is/are malfunctioning.
NOTE:
When switched to STEP-3, LED of REC position blinks for approxi-
mately 50 seconds.
*1: AT C - 6 2 , "
DIAGNOSIS PROCEDURE FOR MODE DOOR
MOTOR" .
*2: AT C - 6 8 , "
DIAGNOSIS PROCEDURE FOR INTAKE DOOR
MOTOR" .
>> INSPECTION END
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Mode control dial position Unusual Malfunctioning sensor and door motor (Including circuits) Reference page
VENT
A/C LED: OFFAmbient sensor *2
B/L In-vehicle sensor *3
FOOT or FOOT2
Sunload sensor
*1*4
D/F or D/F2 Intake sensor *5
DEF Air mix door motor (LCU) PBR *6
Unusual Mode or intake door position Reference page
REC LED: ON Mode door motor *1
FRE LED: ON Intake door motor *2
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AUXILIARY MECHANISM: TEMPERATURE SETTING TRIMMER
The trimmer compensates for differences in range of ±3°C (±6°F) between temperature setting (temperature
control dial position) and temperature felt by customer.
Operating procedures for this trimmer are as follows:
1. Set fan control dial to OFF.
2. Turn ignition switch ON.
3. Set in self-diagnosis mode as follows. Within 10 seconds after starting engine (ignition switch is turned
ON.), press intake switch for at least 5 seconds.
4. When intake switch is pressed, temperature shifts in following order: 0°C (0°F)→ 1°C (2°F)→ 2°C (4°F)→
3°C (6°F)→ −3°C (−6°F)→ −2°C (−4°F)→ −1°C (−2°F)→ return to 0°C (0°F).
When battery cable is disconnected or battery voltage is below 9 V, trimmer operation is canceled. Tempera-
ture set becomes that of initial condition, i.e. 0°C (0°F).
Setting temperatureLED status of each switch
FRE REC A/C
−3°C (−6°F) ON ON ON
−2°C (−4°F) ON ON OFF
−1°C (−2°F) ON OFF ON
0°C (0°F) (Initial setting) OFF OFF OFF
1°C (2°F) OFF OFF ON
2°C (4°F) OFF ON OFF
3°C (6°F) OFF ON ON

TROUBLE DIAGNOSIS
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AUXILIARY MECHANISM: FOOT POSITION SETTING TRIMMER
Wind distribution ratio in FOOT mode can be set.
Operating procedures for this trimmer are as follows:
1. Set fan control dial to AUTO.
2. Turn ignition switch ON.
3. Set in self-diagnosis mode as follows. Within 10 seconds after starting engine (ignition switch is turned
ON.), press intake switch for at least 5 seconds.
4. Press intake switch as desired.
When battery cable is disconnected or battery voltage is below 9 V, trimmer operation is canceled. Wind distri-
bution ratio set becomes that of initial condition.
AUXILIARY MECHANISM: INLET PORT MEMORY FUNCTION
When ignition switch is turned from OFF to ON, inlet port memory function at manual mode can be set.
Operating procedures for this trimmer are as follows:
1. Set fan control dial to 1st - 12th speed.
2. Turn ignition switch ON.
3. Set in self-diagnosis mode as follows. Within 10 seconds after starting engine (ignition switch is turned
ON.), press intake switch for at least 5 seconds.
4. Press intake switch as desired.
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Ty p eLED status of each switch
FRE REC A/C
Type-A (Initial setting) OFF OFF ON
Ty p e - B O F F O N O F F
Type-C OFF ON ON
Type-D ON OFF OFF
LED status of
FRE positionLED status of
REC positionSetting status
Setting changeover
method
FRE REC
OFF OFF AUTO control AUTO control
Intake SW: ON OFF ON AUTO control (Initial setting)Manual REC status is memorized.
(Initial setting)
ON ON Manual FRE status is memorized. AUTO control
ON OFF Manual FRE status is memorized. Manual REC status is memorized.

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5. CHECK MOTOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect each door motor connector.
3. Check continuity between each door motor harness connector
terminal 2 and ground.
OK or NG
OK >> GO TO 6.
NG >> Repair harness or connector.
6. CHECK MOTOR OPERATION
1. Reconnect each door motor connector.
2. Turn ignition switch ON.
3. Confirm operation of each door motor.
OK or NG
OK >> Return to operate normally.

Poor contact in motor connector
NG >> Does not operate normally.

GO TO 7.
7. CHECK AIR MIX DOOR MOTOR AND INTAKE DOOR MOTOR OPERATION
1. Turn ignition switch OFF.
2. Disconnect mode door motor, air mix door motor and intake door motor connector.
3. Reconnect air mix door motor and intake door motor connector.
4. Turn ignition switch ON.
5. Confirm operation of air mix door motor and intake door motor.
OK or NG
OK >> Air mix door motor and intake door motor operate normally.

Replace mode door motor.
NG >> Air mix door motor and intake door motor does not operate normally.

GO TO 8.
8. CHECK MODE DOOR MOTOR AND INTAKE DOOR MOTOR OPERATION
1. Turn ignition switch OFF.
2. Disconnect air mix door motor connector.
3. Reconnect mode door motor connector.
4. Turn ignition switch ON.
5. Confirm operation of mode door motor and intake door motor.
OK or NG
OK >> Mode door motor and intake door motor operate normally.

Replace air mix door motor.
NG >> Mode door motor and intake door motor does not operate normally.

GO TO 9. 2 – Ground : Continuity should exist.
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TROUBLE DIAGNOSIS
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9. CHECK MODE DOOR MOTOR AND AIR MIX DOOR MOTOR OPERATION
1. Turn ignition switch OFF.
2. Disconnect intake door motor connector.
3. Reconnect air mix door motor connector.
4. Turn ignition switch ON.
5. Confirm operation of mode door motor and air mix door motor.
OK or NG
OK >> Mode door motor and air mix door motor operate normally.

Replace intake door motor.
NG >> Mode door motor and air mix door motor does not operate normally.

Replace unified meter and A/C amp.

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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).
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