cooling NISSAN X-TRAIL 2003 Electronic User Guide

TROUBLE DIAGNOSIS
ATC-53
C
D
E
F
G
H
I
K
L
MA
B
AT C
CHECKING TEMPERATURE DECREASE
1. Turn the temperature dial until 18°C(60°F) is displayed.
2. Check for cold air at discharge air outlets.
If NG, go to trouble diagnosis procedure for insufficient coolingAT C -
81.
If OK, continue with next check.
CHECKING TEMPERATURE INCREASE
1. Turn the temperature dial until 32°C(90°F) is displayed.
2. Check for hot air at discharge air outlets.
If NG, go to trouble diagnosis procedure for insufficient heatingAT C -
89.
If OK, continue with next check.
CHECKING AUTO MODE
1. Press A/C switch.
2. Display should indicate AUTO (no ECON).
lConfirm that the compressor clutch engages (audio or visual
inspection). (Discharge air and blower speed will depend on
ambient, in-vehicle, and set temperatures.)
If NG, go to trouble diagnosis procedure for A/C systemAT C - 5 3
,
then if necessary, trouble diagnosis procedure for magnet clutch
AT C - 7 3
.
If all operational check are OK (symptom can not be duplicated), go
to Incident Simulation Tests inGI-24, "
How to Perform Efficient Diag-
nosis for an Electrical Incident"and perform tests as outlined to
simulate driving conditions environment. If symptom appears, refer
toAT C - 3 0
and perform applicable trouble diagnosis procedures.
Power Supply and Ground Circuit for Auto Amp.EJS001GZ
SYMPTOM: A/C system does not come on.
RJIA0500E
RJIA0501E
RJIA0502E

TROUBLE DIAGNOSIS
ATC-61
C
D
E
F
G
H
I
K
L
MA
B
AT C
COMPONENT DESCRIPTION
Mode Door Motor
The mode door motor is attached to the heater & cooling unit. It
rotates so that air is discharged from the outlet set by the auto ampli-
fier. Motor rotation is conveyed to a link which activates the mode
door.
DIAGNOSTIC PROCEDURE
SYMPTOM: Mode door motor and/or air mix door motor does not operate normally.
Perform diagnostic procedure for LAN system circuit. Refer toATC-56, "
LAN System Circuit".
Air Mix Door Motor CircuitEJS001H2
SYMPTOM:
lDischarge air temperature does not change.
lAir mix door motor does not operate.
RJIA0513E
RJIA0514E

ATC-64
TROUBLE DIAGNOSIS
COMPONENT DESCRIPTION
Air Mix Door Motor
The air mix door motor is attached to the heater & cooling unit. It
rotates so that the air mix door is opened or closed to a position set
by the auto amplifier. The air mix door position is then fed back to the
auto amplifier by PBR built-in air mix door motor.
DIAGNOSTIC PROCEDURE
SYMPTOM: Discharge air temperature does not change.
Perform diagnostic procedure for LAN system circuit. Refer toAT C - 5 6 , "
LAN System Circuit".
Intake Door Motor CircuitEJS001H3
SYMPTOM:
lIntake door does not change.
lIntake door motor does not operate normally.
RJIA0516E
RJIA0517E

TROUBLE DIAGNOSIS
ATC-81
C
D
E
F
G
H
I
K
L
MA
B
AT C
Dual-pressure Switch (With diesel engine)
Thermal Protector (With diesel engine)
Check continuity between compressor harness terminal and field
coil.
Insufficient CoolingEJS001H6
SYMPTOM: Insufficient cooling
Compressor: ON
KPa (bar, kg/cm2,psi)Compressor: OFF
KPa (bar, kg/cm2,psi)
Low-pressure side 186 (1.86, 1.9, 27) 177 (1.77, 1.8, 26)
High-pressure side 1,569 (15.7, 16, 228) 2,746 (27.5, 28, 398)
RJIA0548E
RHA671H

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 Reading
(YD engine)".
*4 Self-diagnosisAT C - 4 9 , "
AUXILIARY
MECHANISM: TEMPERATURE SET-
TING TRIMMER"STEP6.*5 LAN system circuitAT C -5 6
*6 Blower motor circuitAT C -6 7
*7 Magnet clutch circuitAT C - 7 3*8AT C - 8 3 , "PERFORMANCE TEST
DIAGNOSES"
*9 Operational checkAT C - 5 1
*10 Self-diagnosisAT C - 4 2, see No.5 or
7.*11 Checking drive belts,EM-13QR
engine;EM-110
YD engine*12 Cooling fan motor operation ,CO-7QR engine;CO-28YD engine
RJIA0549E

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

TROUBLE DIAGNOSIS
ATC-89
C
D
E
F
G
H
I
K
L
MA
B
AT C
Low-pressure Side Becomes Negative.
Insufficient HeatingEJS001H7
SYMPTOM: Insufficient heating
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
frosted or dewed.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 problem is caused by
water or foreign particles.
lIf water is the cause, initially
cooling is okay. Then the
water freezes causing a
blockage. Drain water from
refrigerant or replace refrig-
erant.
lIf due to foreign particles,
remove expansion valve
and remove the particles
with dry and compressed air
(not shop air).
lIf either of the above meth-
ods cannot correct the prob-
lem, replace expansion
valve.
lReplace desiccant assy.
lCheck lubricant for contami-
nation.
AC362A

ATC-96
TROUBLE DIAGNOSIS
Aspirator
The aspirator is located on front side of heater & cooling unit. It pro-
duces vacuum pressure due to air discharged from the heater &
cooling unit, continuously taking compartment air in the aspirator.
DIAGNOSTIC PROCEDURE
SYMPTOM: In-vehicle sensor circuit is open or shorted. (22 or -22 is
indicated on auto amp. as a result of conducting Self-diagnosis
STEP 2.)
1.CHECK IN-VEHICLE SENSOR CIRCUIT BETWEEN IN-VEHICLE SENSOR AND BODY GROUND
Disconnect in-vehicle sensor harness connector.
Ye s o r N o
Yes >>GOTO2.
No >> GO TO 4.
RJIA0557E
RHA482A
RJIA0058E
Te r m i n a l s
Voltag e (+)
(-)
ConnectorTerminal (Wire
color)
M34 1 (P) ground Approx. 5V
RJIA0559E

TROUBLE DIAGNOSIS
ATC-101
C
D
E
F
G
H
I
K
L
MA
B
AT C
Intake Sensor CircuitEJS001HE
COMPONENT DESCRIPTION
Intake Sensor
The intake sensor is located on the heater & cooling unit. It converts
temperature of air after it passes through the evaporator into a resis-
tance value which is then input to the auto amp.
After disconnecting intake sensor harness connector, measure resis-
tance between terminals 1 and 2 at sensor harness side, using the
table below.
If NG, replace intake sensor.
DIAGNOSTIC PROCEDURE
SYMPTOM: Intake sensor circuit is open or shorted. (24 or -24) is
indicated on auto amp. as a result of conducting Self-diagnosis
STEP 2.)
Temperature°C(°F)Resistance kW
With gasoline engine With diesel engine
-15 (5) 12.34 18.63
-10 (14) 9.62 14.15
-5 (23) 7.56 10.86
0(32) 6.00 8.41
5(41) 4.80 6.58
10 (50) 3.87 5.19
15 (59) 3.15 4.12
20 (68) 2.57 3.30
25 (77) 2.12 2.67
30 (86) 1.76 2.17
35 (95) 1.47 1.78
40 (104) 1.23 1.46
45 (113) 1.04 1.21
RJIA0051E
RJIA0567E

ATC-110
BLOWER UNIT
CAUTION:
If retaining tabs are damaged while disassembling blower unit,
use 9 screws (27111-2Y000) to assemble blower unit.
1. Fan control amplifier 8. Screw 15. Upper case 2
2. Screw 9. Bell mouth 16. Intake door 2
3. Cooling hose 10. Intake door lever 2 17. Intake door 1
4. Blower fan motor assembly 11. Intake door lever 1 18. Upper case 1
5. Washer 12. Intake door link 19. Screw
6. Blower fan 13. Intake door motor 20. Clean filter
7. Nut 14. Screw 21. Filter cover
RJIA0053J
RJIA0097E