2006 INFINITI QX56 Factory Service Manual

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Page 521 of 3383

INFINITI QX56 2006 Factory Service Manual ATC-120
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
12. CHECK CAN COMMUNICATION
Check CAN communication. Refer to LAN-26, "
CAN COMMUNICATION" .
BCM – ECM
ECM – IPDM E/R
ECM – Front

Page 522 of 3383

INFINITI QX56 2006 Factory Service Manual TROUBLE DIAGNOSISATC-121
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Revision: November 2009 2006 QX56
Insufficient CoolingEJS003XW
SYMPTOM: Insufficient cooling
INSPECTION FLOW
*1ATC-58, "Operational Check
(Front)"

Page 523 of 3383

INFINITI QX56 2006 Factory Service Manual ATC-122
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
PERFORMANCE TEST DIAGNOSES
*1ATC-124, "PERFORMANCE
CHART"
*2 ATC-124, "PERFORMANCE
CHART"
*3ATC-125, "Trouble Diagnoses for
Unusual Pressu

Page 524 of 3383

INFINITI QX56 2006 Factory Service Manual TROUBLE DIAGNOSISATC-123
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Revision: November 2009 2006 QX56
*1ATC-176, "Removal and Installation
for Compressor Clutch"
*2ATC-93, "Front Blower Motor Circuit"*3 EM-13, "Che

Page 525 of 3383

INFINITI QX56 2006 Factory Service Manual ATC-124
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
PERFORMANCE CHART
Test Condition
Testing must be performed as follows:
Test Reading
Recirculating-to-discharge Air Temperature Table
Ambient

Page 526 of 3383

INFINITI QX56 2006 Factory Service Manual TROUBLE DIAGNOSISATC-125
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Revision: November 2009 2006 QX56
TROUBLE DIAGNOSES FOR UNUSUAL PRESSURE
Whenever system′s high and/or low side pressure is unusual, diagnose usi

TROUBLE DIAGNOSISATC-125
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Revision: November 2009 2006 QX56
TROUBLE DIAGNOSES FOR UNUSUAL PRESSURE
Whenever system′s high and/or low side pressure is unusual, diagnose using a manifold gauge. The marker
above the gauge scale in the following tables indicates the standard (usual) pressure range. Since the stan-
dard (usual) pressure, however, differs from vehicle to vehicle, refer to above table (Ambient air temperature-
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 cycleProbable causeCorrective action
Both high- and low-pressure sides
are too high. Pressure is reduced 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
if 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 and recharge sys-
tem.
Engine tends to overheat. Engine cooling systems mal-
function. Check and repair engine cool-
ing system.
An area of the low-pres-
sure pipe is colder than
areas near the evaporator
outlet.
Plates are sometimes cov-
ered 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 cycleProbable causeCorrective 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 oil for contamination.
AC360A

Page 527 of 3383

INFINITI QX56 2006 Factory Service Manual ATC-126
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
High-pressure Side is Too Low and Low-pressure Side is Too High
Both High- and Low-pressure Sides are Too Low
Gauge indicationRefrigerant cyc

ATC-126
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
High-pressure Side is Too Low and Low-pressure Side is Too High
Both High- and Low-pressure Sides are Too Low
Gauge indicationRefrigerant cycleProbable causeCorrective 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 cycleProbable causeCorrective 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 oil for contamination.
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 liquit tank and expan-
sion valve is clogged.
Check and repair malfunc-
tioning parts.
Check oil for contamination.
Expansion valve and liquid
tank are warm or only cool
when touched. Low refrigerant charge.
↓
Leaking fittings or compo-
nents.Check refrigerant system for
leaks. Refer to AT C - 1 8 7 ,
"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.
Check oil for contamination.
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 oil for contamination.
Air flow volume is too low. Evaporator is frozen.
Check intake sensor circuit.
Refer to ATC-142, "
Intake
Sensor Circuit" .
Repair evaporator fins.
Replace evaporator.
Refer to AT C - 9 3 , "Front
Blower Motor Circuit" .
AC353A

Page 528 of 3383

INFINITI QX56 2006 Factory Service Manual TROUBLE DIAGNOSISATC-127
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Revision: November 2009 2006 QX56
Low-pressure Side Sometimes Becomes Negative
Low-pressure Side Becomes Negative
Gauge indicationRefrigerant cycle

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