NISSAN X-TRAIL 2003 Electronic Repair Manual

TROUBLE DIAGNOSIS
ATC-93
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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

ATC-94
TROUBLE DIAGNOSIS
DIAGNOSTIC PROCEDURE
SYMPTOM: Ambient sensor circuit is open or shorted. (21 or -21 is
indicated on auto amp. As a result of conducting Self-diagnosis
STEP 2.)
1.CHECK VOLTAGE BETWEEN AMBIENT SENSOR HARNESS CONNECTOR AND GROUND
Disconnect ambient sensor harness connector.
Ye s o r N o
Yes >>GOTO2.
No >> GO TO 4.
2.CHECK AMBIENT SENSOR CIRCUIT BETWEEN AMBIENT SENSOR AND AUTO AMP. (LCU)
Disconnect auto amp. (LCU) harness connector.
OK or NG
OK >> GO TO 3.
NG >> Repair harness or connector.
3.CHECK AMBIENT SENSOR
Refer toATC-95, "
Ambient Sensor"
OK or NG
OK >> 1. Replace auto amp. (LCU).
2. Go to self-diagnosis procedureATC-42, "
Self-diagnosis Function"and perform self-diagnosis
STEP-2.Confirm that code No. 20 is displayed.
NG >> Replace ambient sensor.
RHA051GD
Te r m i n a l s
Voltag e (+)
(-)
ConnectorTerminal (Wire
color)
E38 1 (R/B) Ground Approx. 5V
RJIA0553E
Te r m i n a l s
Continuity
ConnectorTerminal (Wire
color)ConnectorTerminal (Wire
color)
E38 2 (B/Y) M53 24 (B/Y) Yes
RJIA0554E

TROUBLE DIAGNOSIS
ATC-95
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AT C
4.CHECK AMBIENT SENSOR CIRCUIT BETWEEN AMBIENT SENSOR AND AUTO AMP. (LCU)
Disconnect auto amp. (LCU) harness connector.
OK or NG
OK >> 1. Replace auto amp. (LCU).
2. Go to self-diagnosis step-by-step procedureAT C - 4 2 ,
"Self-diagnosis Function"and perform self-diagnosis
STEP-2.Confirm that code No. 20 is displayed.
NG >> Repair harness or connector.
COMPONENT INSPECTION
Ambient Sensor
After disconnecting ambient sensor harness connector, measure
resistance between terminals 2 and 1 at sensor harness side, using
the table below.
If NG, replace ambient sensor.
In-vehicle Sensor CircuitEJS001HC
COMPONENT DESCRIPTION
In-vehicle sensor
The in-vehicle sensor is located on instrument lower panel. It con-
verts variations in temperature of compartment air drawn from the
aspirator into a resistance value. It is then input into the auto ampli-
fier.
Te r m i n a l s
Continuity
ConnectorTe r m i n a l
(Wire color)ConnectorTerminal
(Wire color)
E38 1 (R/B) M52 9 (R/B) Yes
RJIA0555E
Temperature°C(°F) Resistance kW
-15 (5) 12.73
-10 (14) 9.92
-5 (23) 7.80
0(32) 6.19
5(41) 4.95
10 (50) 3.99
15 (59) 3.24
20 (68) 2.65
25 (77) 2.19
30 (86) 1.81
35 (95) 1.51
40 (104) 1.27
45 (113) 1.07
RJIA0556E
RJIA0049E

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-97
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2.CHECK IN-VEHICLE SENSOR CIRCUIT BETWEEN IN-VEHICLE SENSOR AND AUTO AMP. (LCU)
Disconnect auto amp. (LCU) harness connector.
OK or NG
OK >> GO TO 3.
NG >> Repair harness or connector.
3.CHECK IN-VEHICLE SENSOR
Refer toAT C - 9 7 , "
In-vehicle 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 in-vehicle 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 IN-VEHICLE SENSOR CIRCUIT BETWEEN AMBIENT SENSOR AND AUTO AMP. (LCU)
Disconnect auto amp. (LCU) harness connector.
OK or NG
OK >> 1. Replace auto amp. (LCU).
2. Go to self-diagnosis step-by-stepAT C - 4 3 , "
PROCE-
DURE"and perform self-diagnosis STEP-2.Confirm
that code No. 20 is displayed.
NG >> Repair harness or connector.
COMPONENT INSPECTION
In-vehicle Sensor
After disconnecting in-vehicle sensor harness connector, measure
resistance between terminals 1 and 2 at sensor harness side, using
the table below.
Te r m i n a l s
Continuity
ConnectorTe r m i n a l
(Wire color)ConnectorTe r m i n a l
(Wire color)
M34 2 (B/Y) M53 24 (B/Y) Yes
RJIA0560E
Te r m i n a l s
Continuity
ConnectorTerminal (Wire
color)ConnectorTerminal (Wire
color)
M34 1 (P) M53 8 (P) Yes
RJIA0561E
Temperature°C(°F) Resistance kW
-15 (5) 12.73
-10 (14) 9.92
-5 (23) 7.80
0(32) 6.19
5(41) 4.95
10 (50) 3.99
15 (59) 3.24
RJIA0562E

ATC-98
TROUBLE DIAGNOSIS
If NG, replace in-vehicle sensor.
Sunload Sensor CircuitEJ S00 1HD
COMPONENT DESCRIPTION
The sunload sensor is located on the left defroster grille. It detects
sunload entering through windshield by means of a photo diode. The
sensor converts the sunload into a current value which is then input
into the auto amplifier.
SUNLOAD INPUT PROCESS
The auto amp. also includes a processing circuit which averages the variations in detected sunload over a
period of time. This prevents drastic swings in the ATC system operation due to small or quick variations in
detected sunload.
For example, consider driving along a road bordered by an occasional group of large trees. The sunload
detected by the sun-load sensor will vary whenever the trees obstruct the sunlight. The processing circuit
averages the detected sun-load over a period of time, so that the (insignificant) effect of the trees momentarily
obstructing the sunlight does not cause any change in the ATC system operation. On the other hand, shortly
after entering a long tunnel, the system will recognize the change in sun-load, and the system will react
accordingly.
DIAGNOSTIC PROCEDURE
SYMPTOM: Sunload sensor circuit is open or shorted. (25 or -25) is
indicated on auto amp. as a result of conducting Self-diagnosis
STEP 2.)
20 (68) 2.65
25 (77) 2.19
30 (86) 1.81
35 (95) 1.51
40 (104) 1.27
45 (113) 1.07 Temperature°C(°F) Resistance kW
RJIA0050E
SHA601F

TROUBLE DIAGNOSIS
ATC-99
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1.CHECK SUN-LOAD SENSOR CIRCUIT BETWEEN SUNLOAD SENSOR AND GROUND
Disconnect sunload sensor harness connector.
OK or NG
OK >> GO TO 2.
NG >> GO TO 4.
2.CHECK SUNLOAD SENSOR CIRCUIT BETWEEN SUNLOAD SENSOR AND AUTO AMP. (LCU)
Disconnect auto amp. (LCU) harness connector.
OK or NG
OK >> GO TO 3.
NG >> Repair harness or connector.
3.CHECK SUNLOAD SENSOR.
Refer toATC-100, "
Sunload Sensor".
OK or NG
OK >> 1. Replace auto amp. (LCU).
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 sunload 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 SUNLOAD SENSOR CIRCUIT BETWEEN SUNLOAD 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 , "
PROCE-
DURE"and perform self-diagnosis STEP-2. Confirm
that code No. 20 is displayed.
NG >> Repair harness or connector.
Te r m i n a l s
Vo l ta g e (+)
(-)
ConnectorTerminal (Wire
color)
M74 1 (O/R) Ground Approx. 5V
RJIA0563E
Te r m i n a l s
Continuity
ConnectorTerminal (Wire
color)ConnectorTerminal (Wire
color)
M74 2 (B/Y) M63 24 (B/Y) Yes
RJIA0564E
Te r m i n a l s
Continuity
ConnectorTerminal (Wire
color)ConnectorTe r m i n a l
(Wirecolor)
M74 1 (OR) M52 10(OR) Yes
RJIA0565E

ATC-100
TROUBLE DIAGNOSIS
COMPONENT INSPECTION
Sunload Sensor
Measure voltage between auto amp. terminal 10 and body ground.
If NG, replace auto amp.
lWhen checking sunload sensor, select a place where sun shines directly on it.
RJIA0566E
SHA930E

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