pressure INFINITI M35 2006 Factory Service Manual

ATC-94
TROUBLE DIAGNOSIS
Revision: 2006 January2006 M35/M45
Magnet Clutch CircuitNJS000GU
SYMPTOM: Magnet clutch does not engage.
INSPECTION FLOW
*1ATC-122, "Intake Sensor Circuit"*2ATC-113, "Ambient Sensor Circuit"*3AT C - 5 6 , "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 13.
*4ATC-95, "
DIAGNOSIS PROCE-
DURE FOR MAGNET CLUTCH"
*5ATC-105, "TROUBLE DIAGNOSIS
FOR UNUSUAL PRESSURE"
*6AT C - 6 4 , "Operational Check"
*7ATC-56, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 2 to 6.*8ATC-41, "
SYMPTOM TABLE"
RJIA4077E

TROUBLE DIAGNOSIS
ATC-97
C
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AT C
Revision: 2006 January2006 M35/M45
5. CHECK BCM INPUT (COMPRESSOR ON) SIGNAL
Check compressor ON/OFF signal. Refer to AT C - 4 0 , "
CONSULT-II
Function (ECM)" .
OK or NG
OK >> GO TO 8.
NG >> GO TO 6.
6. CHECK REFRIGERANT PRESSURE SENSOR
WITH CONSULT-II
1. Start the engine.
2. Check voltage of refrigerant pressure sensor. Refer to EC-149, "
CONSULT-II Reference Value in Data
Monitor" (VQ35DE) or EC-862, "CONSULT-II Reference Value in Data Monitor" (VK45DE).
WITHOUT CONSULT-II
1. Start the engine.
2. Check voltage between ECM harness connector F108 terminal
70 and ground.
OK or NG
OK >>WITH CONSULT-II: GO TO 7.
WITHOUT CONSULT-II: Repair harness or connector.
NG >> Refer to EC-692, "
REFRIGERANT PRESSURE SENSOR" (VQ35DE) or EC-1434, "REFRIGER-
ANT PRESSURE SENSOR" (VK45DE).
7. CHECK ECM INPUT (FAN ON) SIGNAL
Check FAN ON/OFF signal. Refer to AT C - 4 0 , "
CONSULT-II Function
(ECM)" .
OK or NG
OK >> GO TO 8.
NG >> Repair harness or connector.A/C SW ON : AIR COND SIG ON
A/C SW OFF : AIR COND SIG OFF
RJIA3646E
Terminals
Condition Voltage (+)
(
)
ECM
connectorTerminal
No.
F108 70 GroundA/C switch: ON
(Blower motor operates.)Approx. 1.0 -
4.0 V
PBIB1188E
FAN SW ON : HEATER FAN SW ON
FAN SW OFF : HEATER FAN SW OFF
RJIA3646E

ATC-98
TROUBLE DIAGNOSIS
Revision: 2006 January2006 M35/M45
8. CHECK CAN COMMUNICATION
Check CAN communication. Refer to EC-173, "
DTC U1000, U1001 CAN COMMUNICATION LINE"
(VQ35DE) or EC-886, "DTC U1000, U1001 CAN COMMUNICATION LINE" (VK45DE).
ECM – IPDM E/R
ECM – Unified meter and A/C amp.
OK or NG
OK >> Replace ECM.
NG >> Repair or replace malfunctioning part(s).
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-692, "
REFRIGERANT PRESSURE
SENSOR" (VQ35DE) or EC-1434, "REFRIGERANT PRESSURE
SENSOR" (VK45DE).
RJIA4080E
RJIA2954E

TROUBLE DIAGNOSIS
ATC-101
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AT C
Revision: 2006 January2006 M35/M45
PERFORMANCE TEST DIAGNOSIS
*1ATC-103, "PERFORMANCE
CHART"
*2ATC-103, "PERFORMANCE
CHART"
*3ATC-105, "TROUBLE DIAGNOSIS
FOR UNUSUAL PRESSURE"
*4AT C - 8 3 , "Air Mix Door Motor Circuit"
SJIA1226E

TROUBLE DIAGNOSIS
ATC-103
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AT C
Revision: 2006 January2006 M35/M45
PERFORMANCE CHART
Test Condition
Testing must be performed as follows:
Test Reading (VQ35DE)
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 switch
(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 temperatureC (F)
50 - 6020 (68) 5.5 - 7.2 (42 - 45)
25 (77) 8.5 - 10.9 (47 - 52)
30 (86) 12.3 - 15.1 (54 - 59)
35 (95) 16.5 - 19.8 (62 - 68)
40 (104) 21.0 - 25.0 (70 - 77)
60 - 7020 (68) 7.2 - 9.0 (45 - 48)
25 (77) 10.9 - 13.4 (52 - 56)
30 (86) 15.1 - 18.0 (59 - 64)
35 (95) 19.8 - 23.0 (68 - 73)
40 (104) 25.0 - 29.0 (77 - 84)
Ambient air
High-pressure (Discharge side)
kPa (kg/cm
2 , psi)Low-pressure (Suction side)
kPa (kg/cm2 , psi) Relative humidity
%Air temperatureC (F)
50 - 7020 (68)733 - 895
(7.4 - 9.2, 106.3 - 129.8)180 - 220
(1.8 - 2.2, 26.1 - 31.9)
25 (77)838 - 1,025
(8.6 - 10.5, 121.5 - 148.6)210 - 257
(2.1 - 2.7, 30.5 - 37.3)
30 (86)985 - 1,204
(10.1 - 12.2, 142.8 - 174.6)239 - 293
(2.4 - 3.0, 34.7 - 42.5)
35 (95)1,115 - 1,363
(11.4 - 13.9, 161.7 - 197.6)270 - 330
(2.8 - 3.4, 39.2 - 47.9)
40 (104)1,294 - 1,581
(13.2 - 16.1, 187.6 - 229.2)331 - 405
(3.4 - 4.2, 48.0 - 58.7)

ATC-104
TROUBLE DIAGNOSIS
Revision: 2006 January2006 M35/M45
Test Reading (VK45DE)
Recirculating-to-discharge Air Temperature Table
Ambient Air Temperature-to-operating Pressure Table
Inside air (Recirculating air) at blower assembly inlet
Discharge air temperature at center ventilator
C (F) Relative humidity
%Air temperatureC (F)
50 - 6020 (68) 6.0 - 7.4 (43 - 45)
25 (77) 8.9 - 10.6 (48 - 51)
30 (86) 12.5 - 14.6 (55 - 58)
35 (95) 16.7 - 19.4 (62 - 67)
60 - 7020 (68) 7.4 - 8.7 (45 - 48)
25 (77) 10.6 - 12.2 (51 - 54)
30 (86) 14.6 - 16.7 (58 - 62)
35 (95) 19.4 - 22.1 (67 - 72)
Ambient air
High-pressure (Discharge side)
kPa (kg/cm
2 , psi)Low-pressure (Suction side)
kPa (kg/cm2 , psi) Relative humidity
%Air temperatureC (F)
50 - 7020 (68)907 - 1,106
(9.3 - 11.3, 131.5 - 160.4)192 - 238
(1.9 - 2.4, 27.8 - 34.5)
25 (77)987 - 1,207
(10.1 - 12.3, 143.1 - 175.0)210 - 262
(2.1 - 2.7, 30.5 - 38.0)
30 (86)1,072 - 1,312
(10.9 - 13.4, 155.4 - 190.2)233 - 284
(2.3 - 2.9, 33.8 - 41.2)
35 (95)1,168 - 1,425
(11.9 - 14.6, 169.4 - 206.6)258 - 320
(2.7 - 3.3, 37.4 - 46.4)
40 (104)1,272 - 1,550
(12.9 - 15.8, 184.4 - 224.8)288 - 356
(3.0 - 3.7, 41.8 - 51.6)

TROUBLE DIAGNOSIS
ATC-105
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AT C
Revision: 2006 January2006 M35/M45
TROUBLE DIAGNOSIS FOR UNUSUAL PRESSURE
Whenever system’s high and/or low side pressure(s) is/are unusual, diagnose using a manifold gauge. The
marker above the gauge scale in the following tables indicates the standard (usual) pressure range. Since the
standard (usual) pressure, however, differs from vehicle to vehicle, refer to above table (Ambient air tempera-
ture-to-operating pressure table).
Both High- and Low-pressure Sides are Too High
High-pressure Side is Too High and Low-pressure Side is Too Low
Gauge indication Refrigerant cycle Probable cause Corrective action
Both high- and low-pressure sides
are too high.The pressure returns to nor-
mal soon after water is
splashed on condenser.Excessive refrigerant charge
in refrigeration cycle.Reduce refrigerant until speci-
fied pressure is obtained.
Air suction by cooling fan is
insufficient.Insufficient condenser cooling
performance.
1. Condenser fins are clogged.
2. Improper fan rotation of
cooling fan.
Clean condenser.
Check and repair cooling fan
as necessary.
Low-pressure pipe is not
cold.
When compressor is
stopped high-pressure
value quickly drops by
approximately 196 kPa (2
kg/cm
2 , 28 psi). It then
decreases gradually there-
after.Poor heat exchange in con-
denser
(After compressor operation
stops, high-pressure
decreases too slowly.).Air in refrigeration cycle.Evacuate repeatedly and
recharge system.
Engine tends to overheat.Engine cooling systems mal-
function.Check and repair each engine
cooling system.
An area of the low-pres-
sure pipe is colder than
areas near the evaporator
outlet.
Low-pressure pipe is
sometimes covered with
frost.
Excessive liquid refrigerant
on low-pressure side.
Excessive refrigerant dis-
charge flow.
Expansion valve is open a
little compared with the
specification.

Improper expansion valve
adjustment.Replace expansion valve.
AC359A
Gauge indication Refrigerant cycle Probable cause Corrective action
High-pressure side is too high and
low-pressure side is too low.
Upper side of condenser and
high-pressure side are hot,
however, liquid tank is not so
hot.High-pressure tube or parts
located between compressor
and condenser are clogged or
crushed.
Check and repair or replace
malfunctioning parts.
Check lubricant for contami-
nation.
AC360A

ATC-106
TROUBLE DIAGNOSIS
Revision: 2006 January2006 M35/M45
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 may
be 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-170, "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-122, "
Intake
Sensor Circuit" .
Replace compressor.
Repair evaporator fins.
Replace evaporator.
Refer to AT C - 8 9 , "Blower
Motor Circuit" .
AC353A

TROUBLE DIAGNOSIS
ATC-107
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AT C
Revision: 2006 January2006 M35/M45
Low-pressure Side Sometimes Becomes Negative
Low-pressure Side Becomes Negative
DIAGNOSIS PROCEDURE FOR INSUFFICIENT COOLING
SYMPTOM: Insufficient cooling
1. CHECK POWER SUPPLY FOR ECV (ELECTRONIC CONTROL VALVE)
1. Disconnect compressor (ECV) connector.
2. Turn ignition switch ON.
3. Check voltage between compressor (ECV) harness connector
F34 terminal 2 and ground.
OK or NG
OK >> GO TO 2.
NG >> Check power supply circuit and 10A fuse [No. 12,
located in the fuse block (J/B)]. Refer to P G - 111 , "
FUSE
BLOCK - JUNCTION BOX (J/B)" .
If fuse is OK, check harness for open circuit. Repair or replace if necessary.
If fuse is NG, check harness for short circuit and replace fuse.
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
2 – ground : Battery voltage
RJIA4213E

ATC-116
TROUBLE DIAGNOSIS
Revision: 2006 January2006 M35/M45
In-Vehicle Sensor CircuitNJS000H1
COMPONENT DESCRIPTION
In-vehicle Sensor
The in-vehicle sensor is located on instrument driver lower panel. It
converts variations in temperature of compartment air drawn from
the aspirator into a resistance value. It is then input into the unified
meter and A/C amp.
Aspirator
The aspirator is located on driver’s side of heater & cooling unit
assembly. It produces vacuum pressure due to air discharged from
the heater & cooling unit assembly, continuously taking compartment
air in the aspirator.
RJIA4092E
RJIA4093E
RJIA1804E