2003 NISSAN ALMERA N16 Electronic Repair Manual

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Page 2065 of 3189

NISSAN ALMERA N16 2003 Electronic Repair Manual TROUBLE DIAGNOSIS
ATC-85
C
D
E
F
G
H
I
K
L
MA
B
AT C
COMPONENT INSPECTION
A/C Relay
Check continuity between terminal Nos. 3 and 5.
If NG, replace relay.
Refrigerant Pressure Sensor (With Gasoline Eng

Page 2066 of 3189

NISSAN ALMERA N16 2003 Electronic Repair Manual ATC-86
TROUBLE DIAGNOSIS
Insufficient Cooling
EJS001ZQ
SYMPTOM: Insufficient cooling
INSPECTION FLOW
*1ATC-42, "Self-diagnosis Function",
see No.1.*2ATC-63, "Air Mix Door Motor Circuit"

Page 2067 of 3189

NISSAN ALMERA N16 2003 Electronic Repair Manual TROUBLE DIAGNOSIS
ATC-87
C
D
E
F
G
H
I
K
L
MA
B
AT C
*7ATC-75, "Magnet Clutch Circuit"*8AT C - 8 8 , "PERFORMANCE TEST
DIAGNOSES"
*9AT C - 5 1 , "Operational Check"
*10ATC

Page 2068 of 3189

NISSAN ALMERA N16 2003 Electronic Repair Manual ATC-88
TROUBLE DIAGNOSIS
PERFORMANCE TEST DIAGNOSES
*1ATC-90, "PERFORMANCE CHART"*2ATC-90, "PERFORMANCE CHART"*3AT C - 9 2 , "TROUBLE DIAGNOSES
FOR UNUSUAL PRESSURE"
*4 ATC

Page 2069 of 3189

NISSAN ALMERA N16 2003 Electronic Repair Manual TROUBLE DIAGNOSIS
ATC-89
C
D
E
F
G
H
I
K
L
MA
B
AT C
*1ATC-138, "Compressor Clutch"*2AT C - 6 9 , "Blower Motor Circuit"*3 QG engine: EM-11, "Checking Drive
Belts"
YD engine

Page 2070 of 3189

NISSAN ALMERA N16 2003 Electronic Repair Manual ATC-90
TROUBLE DIAGNOSIS
PERFORMANCE CHART
Test Condition
Testing must be performed as follows:
Test Reading (Gasoline Engine)
Recirculating-to-discharge Air Temperature Table
Ambient Air Temperature-

Page 2071 of 3189

NISSAN ALMERA N16 2003 Electronic Repair Manual TROUBLE DIAGNOSIS
ATC-91
C
D
E
F
G
H
I
K
L
MA
B
AT C
Ambient Air Temperature-to-operating Pressure Table
60 - 7020 (68) 9.0 - 11.0 (48 - 52)
25(77) 14.0 - 16.5 (57 - 62)
30 (86) 18.8 - 21.5 (66 - 71)

Page 2072 of 3189

NISSAN ALMERA N16 2003 Electronic Repair Manual ATC-92
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

ATC-92
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 cycleReduce refrigerant until spec-
ified pressure is obtained.
Air suction by cooling fan is
insufficient.Insufficient condenser cooling
performance
↓
1. Condenser fins are clogged.
2. Improper fan rotation of cool-
ing 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
(1.96 bar, 2 kg/cm
2 , 28
psi). It then decreases
gradually thereafter.Poor heat exchange in con-
denser
(After compressor operation
stops, high pressure decreases
too slowly.)
↓
Air in refrigeration cycleEvacuate 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.
●Plates are sometimes cov-
ered with frost.
●Excessive liquid refrigerant
on low-pressure side
●Excessive refrigerant dis-
charge flow
●Expansion valve is open a lit-
tle compared with the specifi-
cation.
↓
1. Improper expansion valve
installation
2. Improper expansion valve
adjustmentReplace 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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