Infiniti F50. Manual — part 142
TROUBLE DIAGNOSIS
ATC-93
C
D
E
F
G
H
I
K
L
M
A
B
ATC
PERFORMANCE TEST DIAGNOSES
*1
.
*2
*3
ATC-96, "TROUBLE DIAGNOSES
FOR UNUSUAL PRESSURE"
*4
ATC-74, "Air Mix Door Motor Circuit"
RJIA1601E
TROUBLE DIAGNOSIS
ATC-95
C
D
E
F
G
H
I
K
L
M
A
B
ATC
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 location
Indoors or in the shade (in a well-ventilated place)
Doors
Closed
Door window
Open
Hood
Open
TEMP.
Max. COLD
Mode switch
(Ventilation) set
Intake switch
(Recirculation) set
(blower) speed
Max. 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 - 60
25 (77)
8.8 - 11.1 (48 - 52)
30 (86)
12.2 - 15.1 (54 - 59)
35 (95)
16.4 - 20.0 (62 - 68)
60 - 70
25 (77)
11.1 - 13.5 (52 - 56)
30 (86)
15.1 - 18.0 (59 - 64)
35 (95)
20.0 - 23.2 (68 - 74)
Ambient air
High-pressure (Discharge side)
kPa (kg/cm
2
, psi)
Low-pressure (Suction side)
kPa (kg/cm
2
, psi)
Relative humidity
%
Air temperature
°
C (
°
F)
50 - 70
30 (86)
1,360 - 1,660
(13.87 - 16.93, 197.2 - 240.7)
210 - 270 (2.14 - 2.70, 30.5 - 39.2)
35 (95)
1,480 - 1,800
(15.10 - 18.00, 214.6 - 261.0)
250 - 320 (2.55 - 3.26, 36.3 - 46.4)
40 (104)
1,900 - 2,080
(19.38 - 20.80, 275.5 - 301.6)
300 - 360 (3.06 - 3.67, 43.5 - 52.2)
ATC-96
TROUBLE DIAGNOSIS
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 cycle
Probable cause
Corrective 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
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-pressure
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 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
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