Infiniti FX35 / FX45. Manual — part 121
ATC-80
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
Low-pressure Side Sometimes Becomes Negative
Low-pressure Side Becomes Negative
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 oc-
curs somewhere in high-
pressure side.
High-pressure pipe located be-
tween liquid tank and expan-
sion 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
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
.
• Replace compressor.
• Repair evaporator fins.
• Replace evaporator.
• Refer to
.
AC353A
Gauge indication
Refrigerant cycle
Probable cause
Corrective action
Low-pressure side sometimes be-
comes negative.
• Air conditioning system does
not function and does not cy-
clically cool the compart-
ment air.
• The system constantly func-
tions for a certain period of
time after compressor is
stopped and restarted.
Refrigerant does not discharge
cyclically.
↓
Moisture is frozen at expan-
sion valve outlet and inlet.
↓
Water is mixed with refrigerant.
• Drain water from refrigerant
or replace refrigerant.
• Replace liquid tank.
AC354A
TROUBLE DIAGNOSIS
ATC-81
< SERVICE INFORMATION >
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ATC
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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
F6 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
• 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.
2.
CHECK ECV CONTROL SIGNAL
1.
Turn ignition switch OFF.
2.
Reconnect compressor (ECV) connector.
3.
Perform self-diagnosis. Refer to
ATC-43, "Self-Diagnosis Function"
4.
Set in self-diagnosis STEP-4 (Code No. 45). Refer to
ATC-43, "Self-Diagnosis Function"
.
5.
Confirm ECV control signal between unified meter and A/C amp.
harness connector M57 terminal 45 and ground using an oscillo-
scope.
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 frost-
ed 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 wa-
ter freezes causing a block-
age. Drain water from
refrigerant or replace refrig-
erant.
• If due to foreign particles, re-
move 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
RJIA2294E
RJIA2295E
ATC-82
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
OK or NG
OK
>> Replace compressor.
NG
>> GO TO 3.
3.
CHECK CIRCUIT CONTINUITY BETWEEN ECV AND UNIFIED METER AND A/C AMP.
1.
Turn ignition switch OFF.
2.
Disconnect compressor (ECV) and unified meter and A/C amp. connector.
3.
Check continuity between compressor (ECV) harness connector
F6 terminal 3 and unified meter and A/C amp. harness connec-
tor M57 terminal 45.
OK or NG
OK
>> GO TO 4.
NG
>> Repair harness or connector.
4.
CHECK ECV
Check continuity between compressor (ECV) connector F6 terminals
2 and 3.
OK or NG
OK
>> Replace unified meter and A/C amp.
NG
>> Replace compressor.
Insufficient Heating
INFOID:0000000001328192
SYMPTOM: Insufficient heating
INSPECTION FLOW
SJIA1765E
3 – 45
: Continuity should exist.
RJIA2296E
2 – 3
: Continuity should exist.
RJIA2297E
TROUBLE DIAGNOSIS
ATC-83
< SERVICE INFORMATION >
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ATC
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Noise
INFOID:0000000001328193
SYMPTOM: Noise
INSPECTION FLOW
*1
*2
ATC-59, "Air Mix Door Motor Circuit"
*3
ATC-43, "Self-Diagnosis Function"
see No. 4 to 6.
*4
ATC-43, "Self-Diagnosis Function"
see No. 13.
*5
*6
ATC-64, "Blower Motor Circuit"
*7
(VK45DE)
*8
CO-10, "Changing Engine Coolant"
(VQ35DE) or
(VK45DE)
*9
CO-14, "Checking Radiator Cap"
(VQ35DE) or
SJIA1593E
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