2007 NISSAN 350Z air condition

TROUBLE DIAGNOSIS
ATC-47
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AT C
Revision: 2006 November2007 350Z
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.
S J I A 111 3 E
S J I A 111 4 E
SJIA1133E

TROUBLE DIAGNOSIS
ATC-53
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Revision: 2006 November2007 350Z
Operational CheckNJS0000X
The purpose of the operational check is to check if the individual system operates properly.
CHECKING BLOWER
1. Turn fan control dial to 1st speed. Blower should operate on low speed.
2. Turn fan control dial to 2nd speed, and continue checking blower speed until all speeds are checked.
3. Leave blower on max. speed.
If NG, go to trouble diagnosis procedure for AT C - 6 9 , "
Blower Motor Circuit" .
If OK, continue the check.
CHECKING DISCHARGE AIR
1. Turn mode control dial to each position.
2. Confirm that discharge air comes out according to the air distri-
bution table. Refer to AT C - 3 0 , "
Discharge Air Flow" .
Intake door position is checked in the next step.
If NG, go to trouble diagnosis procedure for AT C - 6 0 , "
Mode Door
Motor Circuit" .
If OK, continue the check.
NOTE:
Confirm that the compressor clutch is engaged (sound or visual
inspection) and intake door position is at FRESH when the D/F, D/F2
or DEF position are selected.
CHECKING INTAKE DOOR
1. Press intake switch. Recirculation LED should illuminate.
2. Press intake switch again. Fresh LED should illuminate.
3. Listen for intake door position change. (Slight change of blower sound can be heard.)
If NG, go to trouble diagnosis procedure for AT C - 6 6 , "
Intake Door Motor Circuit" .
If OK, continue the check.
CHECKING TEMPERATURE DECREASE
1. Turn temperature control dial until 18°C (60°F).
2. Check for cold air at discharge air outlets.
If NG, go to trouble diagnosis procedure for AT C - 8 1 , "
Insufficient Cooling" .
If OK, continue the check.
CHECKING TEMPERATURE INCREASE
1. Turn temperature control dial until 32°C (90°F).
2. Check for hot air at discharge air outlets.
If NG, go to trouble diagnosis procedure for AT C - 8 9 , "
Insufficient Heating" .
If OK, continue the check.
CHECKING A/C SWITCH
Turn fan control dial to AUTO position. (Compressor is turned ON automatically.)

Confirm that the compressor clutch engages (sound or visual inspection). (Discharge air and blower
speed will depend on ambient, in-vehicle, and set temperatures.)
If NG, go to trouble diagnosis procedure for AT C - 5 4 , "
Power Supply and Ground Circuit for Auto Amp." , then
if necessary, trouble diagnosis procedure for AT C - 7 4 , "
Magnet Clutch Circuit" .
If all operational checks are OK (symptom cannot be duplicated), go to Incident Simulation Tests in GI-27,
"How to Perform Efficient Diagnosis for an Electrical Incident" and perform tests as outlined to simulate driv-
ing conditions environment. If symptom appears, refer to AT C - 3 4 , "
SYMPTOM TABLE" and perform applica-
ble trouble diagnosis procedures.Conditions : Engine running at normal operating temperature
RJIA2110E

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-77
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Revision: 2006 November2007 350Z
6. CHECK CIRCUIT CONTINUITY BETWEEN BCM AND UNIFIED METER AND A/C AMP.
1. Turn ignition switch OFF.
2. Disconnect BCM connector and unified meter and A/C amp.
connector.
3. Check continuity between BCM harness connector M90 terminal
27 and unified meter and A/C amp. harness connector M50 ter-
minal 42.
OK or NG
OK >> GO TO 7.
NG >> Repair harness or connector.
7. CHECK VOLTAGE FOR UNIFIED METER AND A/C AMP. (COMPRESSOR ON SIGNAL)
1. Reconnect BCM connector and unified meter and A/C amp.
connector.
2. Turn ignition switch ON.
3. Check voltage between unified meter and A/C amp. harness
connector M50 terminal 42 and ground.
OK or NG
OK >> GO TO 8.
NG-1 >> If the voltage is approx. 5 V when A/C switch is ON: Replace unified meter and A/C amp.
NG-2 >> If the voltage is approx. 0 V when A/C switch is OFF: Replace BCM.27 – 42 : Continuity should exist.
RJIA2006E
Terminals
Condition Voltage (+)
(−) Unified meter
and A/C amp.
connectorTerminal No.
M50 42 GroundA/C switch: ON
(Blower motor oper-
ates.)Approx. 0 V
A/C switch: OFF Approx. 5 V
RJIA2007E

ATC-78
TROUBLE DIAGNOSIS
Revision: 2006 November2007 350Z
8. CHECK REFRIGERANT PRESSURE SENSOR
WITH CONSULT-III
1. Start the engine.
2. Check voltage of refrigerant pressure sensor. Refer to EC-127, "
CONSULT-III Reference Value in Data
Monitor" .
WITHOUT CONSULT-III
1. Start the engine.
2. Check voltage between ECM harness connector M71 terminal 105 and ground.
OK or NG
OK >>
WITH CONSULT-III: GO TO 9.

WITHOUT CONSULT-III: GO TO 10.
NG >> Refer to EC-710, "
REFRIGERANT PRESSURE SENSOR" .
9. CHECK BCM INPUT (FAN ON) SIGNAL
Check FAN ON/OFF signal. Refer to AT C - 3 3 , "
CONSULT-III Function (BCM)" .
OK or NG
OK >> GO TO 12.
NG >> GO TO 10.
10. CHECK CIRCUIT CONTINUITY BETWEEN BCM AND UNIFIED METER AND A/C AMP.
1. Turn ignition switch OFF.
2. Disconnect BCM connector and unified meter and A/C amp.
connector.
3. Check continuity between BCM harness connector M90 terminal
28 and unified meter and A/C amp. harness connector M50 ter-
minal 57.
OK or NG
OK >> GO TO 11.
NG >> Repair harness or connector.
Terminals
Condition Voltage (+)
(−)
ECM con-
nectorTerminal No.
M71 105 GroundA/C switch: ON
(Blower motor
operates.)Approx. 1.0 - 4.0 V
FAN SW ON : HEATER FAN SW ON
FAN SW OFF : HEATER FAN SW OFF
28 – 57 : Continuity should exist.
RJIA2009E

TROUBLE DIAGNOSIS
ATC-79
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AT C
Revision: 2006 November2007 350Z
11 . CHECK VOLTAGE FOR UNIFIED METER AND A/C AMP. (FAN ON SIGNAL)
1. Reconnect BCM connector and unified meter and A/C amp.
connector.
2. Turn ignition switch ON.
3. Check voltage between unified meter and A/C amp. harness
connector M50 terminal 57 and ground.
OK or NG
OK >> GO TO 12.
NG-1 >> If the voltage is approx. 5 V when blower motor is ON: Replace unified meter and A/C amp.
NG-2 >> If the voltage is approx. 0 V when blower motor is OFF: Replace BCM.
12. CHECK CAN COMMUNICATION
Check CAN communication. Refer to BCS-16, "
CAN Communication Inspection Using CONSULT-III (Self-
Diagnosis)" .

BCM – ECM

ECM – IPDM E/R

ECM – Unified meter and A/C amp.
OK or NG
OK >> Replace ECM.
NG >> Repair or replace malfunctioning part(s).
Terminals
Condition Voltage (+)
(−) Unified meter
and A/C amp.
connectorTerminal No.
M50 57 GroundFan control dial: ON
(Blower motor oper-
ates.)Approx. 0 V
Fan control dial: OFF Approx. 5 V
RJIA2010E

TROUBLE DIAGNOSIS
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Revision: 2006 November2007 350Z
PERFORMANCE CHART
Test Condition
Testing must be performed as follows:
Test Reading
Recirculating-to-discharge Air Temperature Table
Ambient Air Temperature-to-operating Pressure Table
Vehicle condition Indoors or in the shade (in a well-ventilated place)
Doors Closed
Door windows Open
Hood Open
TEMP. Max. COLD
Mode control dial
(Ventilation) set
Intake switch
(Recirculation) set
Fan (blower) speedMax. speed set
Engine speed Idle speed
Operate the air conditioning system for 10 minutes before taking measurements.
Inside air (Recirculating air) at blower assembly inlet
Discharge air temperature at center ventilator
°C (°F) Relative humidity
%Air temperature
°C (°F)
50 - 6020 (68) 6.1 - 8.7 (43 - 48)
25 (77) 8.5 - 11.5 (47 - 53)
60 - 7020 (68) 8.7 - 11.1 (48 - 52)
25 (77) 11.5 - 14.5 (53 - 58)
Ambient air
High-pressure (Discharge side)
kPa (kg/cm
2 , psi)Low-pressure (Suction side)
kPa (kg/cm2 , psi) Relative humidity
%Air temperature
°C (°F)
50 - 7020 (68)850 - 1,050
(8.67 - 10.71, 123.3 - 152.3)180 - 230
(1.84 - 2.35, 26.1 - 33.4)
25 (77)1,020 - 1,260
(10.40 - 12.85, 147.9 - 182.7)190 - 240
(1.94 - 2.45, 27.6 - 34.8)
30 (86)1,150 - 1,410
(11.73 - 14.38, 166.8 - 204.5)210 - 250
(2.14 - 2.55, 30.5 - 36.3)
35 (95)1,240 - 1,510
(12.65 - 15.40, 179.8 - 219.0)220 - 270
(2.24 - 2.75, 31.9 - 39.2)

ATC-88
TROUBLE DIAGNOSIS
Revision: 2006 November2007 350Z
Low-pressure Side Sometimes Becomes Negative
Low-pressure Side Becomes Negative
Gauge indication Refrigerant cycle Probable cause Corrective action
Low-pressure side sometimes
becomes negative.

Air conditioning system
does not function and does
not cyclically cool the com-
partment air.

The system constantly func-
tions for a certain period of
time after compressor is
stopped and restarted.Refrigerant does not dis-
charge cyclically.
↓
Moisture is frozen at expan-
sion valve outlet and inlet.
↓
Water is mixed with refriger-
ant.

Drain water from refrigerant
or replace refrigerant.

Replace liquid tank.
AC354A
Gauge indication Refrigerant cycle Probable cause Corrective action
Low-pressure side becomes nega-
tive.
Liquid tank or front/rear side of
expansion valve’s pipe is
frosted or wet with dew.High-pressure side is closed
and refrigerant does not flow.
↓
Expansion valve or liquid tank
is frosted.Leave the system at rest until
no frost is present. Start it
again to check whether or not
the malfunction is caused by
water or foreign particles.

If water is the cause, initially
cooling is okay. Then the
water freezes causing a
blockage. Drain water from
refrigerant or replace refrig-
erant.

If due to foreign particles,
remove expansion valve
and remove the particles
with dry and compressed air
(not shop air).

If either of the above meth-
ods cannot correct the mal-
function, replace expansion
valve.

Replace liquid tank.

Check lubricant for contami-
nation.
AC362A