2003 NISSAN X-TRAIL Electronic Repair Manual

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Page 657 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual TROUBLE DIAGNOSIS
ATC-79
C
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MA
B
AT C
12.CHECK CIRCUIT CONTINUITY BETWEEN ECM AND AUTO AMP. (QR ENGINE)
Disconnect ECM connector and auto amp. connector.
OK or NG
OK >> CheckEC-634, "RE

Page 658 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual ATC-80
TROUBLE DIAGNOSIS
16.CHECK CIRCUIT CONTINUITY BETWEEN AUTO AMP. AND DUAL-PRESSURE SWITCH
Disconnect the auto amp. connector.
OK or NG
OK >> GO TO 17.
NG >> Repair harness or connector.
17.CHECK

Page 659 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual TROUBLE DIAGNOSIS
ATC-81
C
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B
AT C
Dual-pressure Switch (With diesel engine)
Thermal Protector (With diesel engine)
Check continuity between compressor harness terminal and field
coi

Page 660 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual ATC-82
TROUBLE DIAGNOSIS
INSPECTION FLOW
*1 Self-diagnosisAT C - 4 2, see No.1. *2 Air mix door motor circuitAT C - 6 1*3 Test readingAT C - 8 5 , "Te s t R e a d i n g
(QR engine)",AT C - 8 5 , "Test

Page 661 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual TROUBLE DIAGNOSIS
ATC-83
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B
AT C
PERFORMANCE TEST DIAGNOSES
*1 Performance chartAT C - 8 4*3 Trouble diagnoses for abnormal pres-
sureAT C - 8 6*4 Air mix door motor circuitAT C -

Page 662 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual ATC-84
TROUBLE DIAGNOSIS
PERFORMANCE CHART
Test Condition
Testing must be performed as follows:
*1ATC-129, "Removal and Installation
for Compressor Clutch"
*2 Trouble diagnoses for blower motor
AT C -

Page 663 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual TROUBLE DIAGNOSIS
ATC-85
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MA
B
AT C
Test Reading (QR engine)
Recirculating-to-discharge Air Temperature Table
Ambient Air Temperature-to-operating Pressure Table
Test Reading (YD engi

Page 664 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual ATC-86
TROUBLE DIAGNOSIS
TROUBLE DIAGNOSES FOR ABNORMAL PRESSURE
Whenever systems high and/or low side pressure is abnormal, diagnose using a manifold gauge. The marker
above the gauge scale in the f

ATC-86
TROUBLE DIAGNOSIS
TROUBLE DIAGNOSES FOR ABNORMAL PRESSURE
Whenever system's high and/or low side pressure is abnormal, diagnose using a manifold gauge. The marker
above the gauge scale in the following tables indicates the standard (normal) pressure range. Since the stan-
dard (normal) 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.
Ambient air
High-pressure (Discharge side)
kPa (kg/cm2, psi)Low-pressure (Suction side)
kPa (kg/cm2, psi) Relative humidity
%Air temperature
°C(°F)
50 - 7020 (68) 765 - 922 (7.8 - 9.4, 111 - 134) 177 - 226 (1.8 - 2.3, 26 - 33)
25 (77) 922 - 1,020 ( 9.4 - 10.4, 134 - 148) 196 - 245 (2.0 - 2.5, 28 - 36)
30 (86) 1,177 - 1,451 (12.0 - 14.8, 171 - 210) 235 - 284 (2.4 - 2.9, 34 - 41)
35 (95) 1,373 - 1,667 (14 - 17, 199 - 242) 275 - 333 (2.8 - 3.4, 40 - 48)
40 (104) 1,618 - 1,961 (16.5 - 20.0, 235 - 284) 333 - 392 (3.4 - 4.0, 48 - 57)
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 con-
denser.Excessive refrigerant charge in
refrigeration cycleReduce 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 cool-
ing fan
lClean condenser.
lCheck and repair cooling fan
as necessary.
lLow-pressure pipe is not
cold.
lWhen compressor is stopped
high-pressure value quickly
drops by approximately 196
kPa (2 kg/cm2, 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.
lAn area of the low-pressure
pipe is colder than areas
near the evaporator outlet.
lPlates are sometimes cov-
ered with frost.
lExcessive liquid refrigerant
on low-pressure side
lExcessive refrigerant dis-
charge flow
lExpansion valve is open a lit-
tle compared with the specifi-
cation.
¯
1. Improper thermal valve
installation
2. Improper expansion valve
adjustmentReplace expansion valve.
AC359A

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