engine 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 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-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 - 6 7 , "
Blower Motor Circuit"
*3 Belt tension,EM-13QR engine ;EM-
11 0YD engine

TROUBLE DIAGNOSIS
ATC-85
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AT C
Test Reading (QR engine)
Recirculating-to-discharge Air Temperature Table
Ambient Air Temperature-to-operating Pressure Table
Test Reading (YD engine)
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 windows Open
Hood Open
TEMP. Max. COLD
Mode switch (Ventilation) set
Intake switch (Recirculation) set
(blower) speedMax. 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 - 6025 (77) 10.0 - 11.6 (50 - 53 )
30 (86) 13.9 - 16.2 (57 - 61)
35 (95) 17.8 - 21.4 (64 - 71)
60 - 7025 (77) 11.6 - 13.9 (53 - 57)
30 (86) 16.2 - 18.9 (61 - 66)
35 (95) 21.4 - 24.5 (71 - 76)
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 - 7030 (86)980 - 1,180
( 9.99 - 12.04 , 142 - 171)230 - 270 (2.35 - 2.75, 33 - 39)
35 (95)1,180 - 1,390
(12.04 - 14.18 , 171 - 202)260 - 310 (2.65 - 3.16, 38 - 45)
40 (104)1,400 - 1,580
( 14.28 - 16.12 , 203 - 229)300 - 350 (3.06 - 3.57, 44 - 51)
Inside air (Recirculating air) at blower assembly inlet
Discharge air temperature at center ventilator
°C(°F) Relative humidity
%Air temperature
°C(°F)
50 - 6020 (68) 6.5 - 9.0 (44 - 48)
25(77) 12 - 14(54 - 57)
30 (86) 15.5 - 18.8 (60 - 66)
35 (95) 20.4 - 24.0 (69 - 75)
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)
35 (95) 24 - 27 (75 - 81)

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

ATC-90
TROUBLE DIAGNOSIS
INSPECTION FLOW
*1 Operational checkAT C - 5 1*6 Self-diagnosisAT C -4 2, see No.14. *10 Thermostat,CO-21QR engine;CO-
42YD engine
*2 Self-diagnosisAT C -4 2
, see No.1. *7 LAN system circuitAT C - 5 6*11CO-9, "Changing Engine Coolant"QR
engine;CO-30, "
ENGINE COOLANT"
YD engine
*3 Self-diagnosisAT C - 4 2
, see No.5. *8 Blower motor circuitAT C - 6 7*12CO-9, "ENGINE COOLANT"QR
engine;CO-30, "
ENGINE COOLANT"
YD engine
*4 Self-diagnosisAT C - 4 2
, see No.7. *9 Air mix door motor circuitAT C - 6 1*13CO-13, "CHECKING RADIATOR
CAP"QR engine;CO-34, "Checking
Radiator Cap"YD ENGINE
*5 Air mix door motor circuitAT C - 6 1
RJIA0550E

ATC-92
TROUBLE DIAGNOSIS
Self-diagnosis
EJS001H9
Symptom: Self-diagnosis can not be performed.
INSPECTION FLOW
Memory FunctionEJS001HA
Symptom: Memory function does not operate.
*1ATC-129, "Removal and Installation
for Compressor Clutch"
*3AT C - 2 1 , "Maintenance of Lubricant
Quantity in Compressor"
*5EM-13, "Checking Drive Belts"QR
engine;EM-110, "
Checking Drive
Belts"YD engine
*2ATC-132, "
Inspection"*4 Operational checkAT C - 5 1
*1 Main power supply and body ground
circuit.PG-3*2 Ambient sensor circuit.AT C - 9 3*3 In-vehicle sensor circuit .AT C - 9 5
*4 sunload sensor circuit.AT C - 9 8*5 Intake sensor circuit.AT C - 1 0 1*6 Air mix door motor.AT C - 6 1
*7 Operational check.AT C - 5 1*8 Symptom table.AT C -3 0*9 Operational checkAT C - 5 1
RJIA0551E

TROUBLE DIAGNOSIS
ATC-93
C
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AT C
INSPECTION FLOW
Ambient Sensor CircuitEJS001HB
COMPONENT DESCRIPTION
Ambient Sensor
The ambient sensor is attached on the hood lock stay. It detects
ambient temperature and converts it into a resistance value which is
then input into the auto amplifier.
AMBIENT TEMPERATURE INPUT PROCESS
The automatic amplifier includes a processing circuit for the ambient sensor input. However, when the temper-
ature detected by the ambient sensor increases quickly, the processing circuit retards the auto amp. function.
It only allows the auto amp. to recognize an ambient temperature increase of 0.33°C(0.6°F) per 100 seconds.
As an example, consider stopping for a cup of coffee after high speed driving. Although the actual ambient
temperature has not changed, the temperature detected by the ambient sensor will increase. This is because
the heat from the engine compartment can radiate to the front grille area, location of the ambient sensor.
*1 Main power supply and body ground
circuit.PG-3*2 Operational check.AT C - 5 1*3 Self-diagnosis.AT C - 4 2
*4 A/C system circuit.AT C - 5 3
RJIA0552E
RJIA0048E

TROUBLE DIAGNOSIS
ATC-101
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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-102
TROUBLE DIAGNOSIS
1.CHECK INTAKE SENSOR CIRCUIT BETWEEN INTAKE SENSOR AND BODY GROUND
Disconnect intake sensor harness connector.
Ye s o r N o
Yes >>GOTO2.
No >> GO TO 4.
2.CHECK INTAKE SENSOR CIRCUIT BETWEEN INTAKE SENSOR AND AUTO AMP. (LCU)
Disconnect auto amp. (LCU) harness connector.
OK or NG
OK >> GO TO 3.
NG >> Repair harness or connector.
Engine modelTe r m i n a l s
Vo l ta g e (+)
(-)
ConnectorTe r m i n a l ( W i r e
color)
With gasoline
engineM68 1 (BR/Y)
Ground Approx. 5V
With diesel engine M69 1 (BR/Y)
RJIA0568E
Engine modelTe r m i n a l s
Continuity Intake sensor Auto amp.
ConnectorTerminal (Wire
color)ConnectorTerminal (Wire
color)
With gasoline
engineM68 2 (B/Y)
M5324 (B/Y)
Ye s
With diesel engine M69 2 (B/Y) 24 (B/Y)
RJIA0569E

TROUBLE DIAGNOSIS
ATC-103
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AT C
3.CHECK INTAKE SENSOR
Refer toATC-101, "
Intake Sensor"
OK or NG
OK >> 1. Replace auto amp.
2. Go to self-diagnosis step-by-stepAT C - 4 3 , "
PROCEDURE"and perform self-diagnosis STEP-
2.Confirm that code No. 20 is displayed.
NG >> 1. Replace intake sensor.
2. Go to self-diagnosis step-by-stepAT C - 4 3 , "
PROCEDURE"and perform self-diagnosis STEP-
2.Confirm that code No. 20 is displayed.
4.CHECK INTAKE SENSOR CIRCUIT BETWEEN AMBIENT SENSOR AND AUTO AMP. (LCU)
Disconnect auto amp. (LCU) harness connector.
OK or NG
OK >> 1. Replace auto amp.
2. Go to self-diagnosis step-by-stepAT C - 4 3 , "
PROCEDURE"and perform self-diagnosis STEP-
2.Confirm that code No. 20 is displayed.
NG >> Repair harness or connector.
Engine modelTerminals
Continuity Intake sensor Auto amp.
ConnectorTerminal (Wire
colorConnectorTerminal (Wire
color)
With gasoline
engineM68 1 (BR/Y)
M5325 (BR/Y)
Ye s
With diesel engine M69 1 (BR/Y) 25 (BR/Y)
RJIA0570E