sensor NISSAN 350Z 2007 Z33 Automatic Air Conditioner Owner's Manual

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
C
D
E
F
G
H
I
K
L
MA
B
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

TROUBLE DIAGNOSIS
ATC-69
C
D
E
F
G
H
I
K
L
MA
B
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

ATC-74
TROUBLE DIAGNOSIS
Revision: 2006 November2007 350Z
Magnet Clutch CircuitNJS00015
SYMPTOM: Magnet clutch does not engage.
INSPECTION FLOW
*1ATC-46, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 1.*2ATC-92, "
Ambient Sensor Circuit"*3AT C - 4 6 , "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 9.
*4ATC-75, "
DIAGNOSIS PROCE-
DURE FOR MAGNET CLUTCH"
*5ATC-86, "TROUBLE DIAGNOSIS
FOR UNUSUAL PRESSURE"
*6AT C - 5 3 , "Operational Check"
*7ATC-46, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 5 to 7.*8ATC-34, "
SYMPTOM TABLE"*9ATC-100, "Intake Sensor Circuit"
SJIA1129E

TROUBLE DIAGNOSIS
ATC-75
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: 2006 November2007 350Z
SYSTEM DESCRIPTION
Unified meter and A/C amp. controls compressor operation by ambient temperature, intake air temperature
and signal from ECM.
Low Temperature Protection Control
Unified meter and A/C amp. will turn compressor ON or OFF as determined by a signal detected by ambient
sensor and intake sensor.
When ambient temperature is higher than −2°C (28°F), the compres-
sor turns ON. The compressor turns OFF when ambient temperature
is lower than −5°C (23°F).
When intake air temperature is higher than 1°C (34°F), the compres-
sor turns ON. The compressor turns OFF when intake air tempera-
ture is lower than −5°C (23°F).
DIAGNOSIS PROCEDURE FOR MAGNET CLUTCH
SYMPTOM: Magnet clutch does not engage when A/C switch is ON.
RHA094GB
SJIA0267E
SJIA1891E

ATC-76
TROUBLE DIAGNOSIS
Revision: 2006 November2007 350Z
1. CHECK AMBIENT SENSOR CIRCUIT AND INTAKE SENSOR CIRCUIT
Check ambient sensor and intake sensor. Refer to AT C - 4 6 , "
FUNCTION CONFIRMATION PROCEDURE" ,
see No. 9.
OK or NG
OK >> GO TO 2.
NG >>

Malfunctioning ambient sensor: Refer to AT C - 9 2 , "Ambient Sensor Circuit" .

Malfunctioning intake sensor: Refer to ATC-100, "Intake Sensor Circuit" .
2. PERFORM AUTO ACTIVE TEST
Refer to PG-20, "
Auto Active Test" .
Dose the magnet clutch operate?
YES >>
WITH CONSULT-III: GO TO 5.

WITHOUT CONSULT-III: GO TO 6.
NO >> Check 10A fuse (No. 79, located in IPDM E/R), and GO TO 3. Refer to PG-23, "
IPDM E/R Termi-
nal Arrangement" .
3. CHECK CIRCUIT CONTINUITY BETWEEN IPDM E/R AND COMPRESSOR
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R connector and compressor connector.
3. Check continuity between IPDM E/R harness connector E8 ter-
minal 33 and compressor harness connector F24 terminal 1.
OK or NG
OK >> GO TO 4.
NG >> Repair harness or connector.
4. CHECK MAGNET CLUTCH CIRCUIT
Check for operation sound when applying battery voltage direct cur-
rent to terminal.
OK or NG
OK >> 1. Replace IPDM E/R.
2. Go to self-diagnosis procedure AT C - 4 6 , "
FUNCTION
CONFIRMATION PROCEDURE" and preform self-
diagnosis STEP-4. Confirm that magnet clutch opera-
tion normal.
NG >> 1. Replace magnet clutch.
2. Go to self-diagnosis procedure AT C - 4 6 , "
FUNCTION
CONFIRMATION PROCEDURE" and preform self-
diagnosis STEP-4. Confirm that magnet clutch operation normal.
5. CHECK BCM INPUT (COMPRESSOR ON) SIGNAL
Check compressor ON/OFF signal. Refer to AT C - 3 3 , "
CONSULT-III Function (BCM)" .
OK or NG
OK >> GO TO 8.
NG >> GO TO 6.
33 – 1 : Continuity should exist.
RJIA2004E
RJIA2005E
A/C SW ON : AIR COND SIG ON
A/C SW OFF : AIR COND SIG OFF

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

ATC-80
TROUBLE DIAGNOSIS
Revision: 2006 November2007 350Z
COMPONENT INSPECTION
Refrigerant Pressure Sensor
The refrigerant pressure sensor is attached to the liquid tank.
Make sure that the A/C refrigerant pressure and the sensor output
voltage are within the specified range as shown in the A/C operating
condition figure. Refer to EC-710, "
REFRIGERANT PRESSURE
SENSOR" .
RJIA1393E
SJIA1841E

TROUBLE DIAGNOSIS
ATC-87
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: 2006 November2007 350Z
High-pressure Side is Too Low and Low-pressure Side is Too High
Both High- and Low-pressure Sides are Too Low
Gauge indication Refrigerant cycle Probable cause Corrective action
High-pressure side is too low and
low-pressure side is too high.High- and low-pressure sides
become equal soon after com-
pressor operation stops.Compressor pressure opera-
tion is improper.
↓
Damaged inside compressor
packings.Replace compressor.
No temperature difference
between high- and low-pres-
sure sides.Compressor pressure opera-
tion is improper.
↓
Damaged inside compressor
packings.Replace compressor.
AC356A
Gauge indication Refrigerant cycle Probable cause Corrective action
Both high- and low-pressure sides
are too low.

There is a big temperature
difference between liquid
tank outlet and inlet. Outlet
temperature is extremely
low.

Liquid tank inlet and expan-
sion valve are frosted.Liquid tank inside is slightly
clogged.

Replace liquid tank.

Check lubricant for contami-
nation.

Temperature of expansion
valve inlet is extremely low
as compared with areas
near liquid tank.

Expansion valve inlet is
frosted.

Temperature difference
occurs somewhere in high-
pressure side.High-pressure pipe located
between liquid tank and
expansion valve is clogged.

Check and repair malfunc-
tioning parts.

Check lubricant for contami-
nation.
Expansion valve and liquid
tank are warm or slightly cool
when touched.Low refrigerant charge.
↓
Leaking fittings or compo-
nents.Check refrigerant for leaks.
Refer to ATC-138, "
Checking
for Refrigerant Leaks" .
There is a big temperature dif-
ference between expansion
valve inlet and outlet while the
valve itself is frosted.Expansion valve closes a little
compared with the specifica-
tion.
↓
1. Improper expansion valve
adjustment.
2. Malfunctioning expansion
valve.
3. Outlet and inlet may be
clogged.

Remove foreign particles by
using compressed air.

Replace expansion valve.

Check lubricant for contami-
nation.
An area of the low-pressure
pipe is colder than areas near
the evaporator outlet.Low-pressure pipe is clogged
or crushed.

Check and repair malfunc-
tioning parts.

Check lubricant for contami-
nation.
Air flow volume is not enough
or is too low.Evaporator is frozen.

Check intake sensor circuit.
Refer to ATC-100, "
Intake
Sensor Circuit" .

Replace compressor.

Repair evaporator fins.

Replace evaporator.

Refer to AT C - 6 9 , "Blower
Motor Circuit" .
AC353A