NISSAN X-TRAIL 2003 Electronic Repair Manual

TROUBLE DIAGNOSIS
ATC-53
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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

ATC-54
TROUBLE DIAGNOSIS
INSPECTION FLOW
COMPONENT DESCRIPTION
Automatic Amplifier (Auto Amp.)
The auto amplifier has a built-in microcomputer which processes
information sent from various sensors needed for air conditioner
operation. The air mix door motor, mode door motor, intake door
motor, blower motor and compressor are then controlled.
The auto amplifier is unitized with control mechanisms. Signals from
various switches and Potentio Temperature Control (PTC) are
directly entered into auto amplifier.
Self-diagnostic functions are also built into auto amplifier to provide
quick check of malfunctions in the auto air conditioner system.
Potentio Temperature Control (PTC)
The PTC is built into the A/C auto amp. It can be set at an interval of
0.5°C(1.0°F) in the 18°C(60°F) to 32°C(90°F) temperature range
by turning the temperature dial. The set temperature is displayed.
*1 Main power supply and ground circuit
PG-3*2 Operational CheckAT C - 5 1*3 Refer to A/C system circuitAT C - 5 5
RJIA0503E
RJIA0488E
RJIA0488E

TROUBLE DIAGNOSIS
ATC-55
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AT C
DIAGNOSTIC PROCEDURE
SYMPTOM: A/C system does not come on.
1.CHECK POWER SUPPLY CIRCUIT FOR AUTO AMP.
OK or NG
OK >> GO TO 2.
NG >> Check 10A fuses (Nos. 15, 19 and 28) located in the fuse block.
lIf fuses are OK, check for open circuit in wiring harness. Repair or replace as necessary.
lIf fuses are NG, replace fuse and check wiring harness for short circuit. Repair or replace as
necessary.
2.CHECK BODY GROUND CIRCUIT FOR AUTO AMP.
Ye s o r N o
Yes >> Replace auto amp. INSPECTION END
No >> Repair or replace harness.
RJIA0504E
Terminals Ignition switch position
(+)
(-) OFF ACC ON
ConnectorTe r m i n a l
(Wire color)
M52 1 (BR/Y)
GroundApprox.
0VApprox.
0VApprox.
12V
M522
(With gaso-
line engine:
R/B), (With
diesel
engine: L)Approx.
12VApprox.
12VApprox.
12V
M52 20 (L/W)Approx.
0VApprox.
12VApprox.
12V
RJIA0505E
Ohmmeter terminal
Continuity (+)
(-)
ConnectorTerminal (Wire
color)
M52 3 (B) Ground Yes
RJIA0506E

ATC-56
TROUBLE DIAGNOSIS
LAN System Circuit
EJS001H0
SYMPTOM: Mode door motor, intake door motor and/or air mix door motor does not operate normally.
DIAGNOSTIC PROCEDURE
1.CHECK POWER SUPPLY FOR AUTO AMP. (LCU) SIDE
OK or NG
OK >> GO TO 2.
NG >> Replace auto amp.(LCU).
2.CHECK SIGNAL FOR AUTO AMP. (LCU) SIDE
OK or NG
OK >> GO TO 3.
NG >> Replace auto amp.(LCU).
RJIA0507E
Te r m i n a l s
Vo l ta g e (+)
(-)
ConnectorTerminal (Wire
color)
M52 5 (L/R) Ground Approx. 12V
RJIA0273E
Te r m i n a l s
Vo ltag e (+)
(-)
ConnectorTerminal (Wire
color)
M52 15 (L) Ground Approx. 5.5V
RJIA0508E

TROUBLE DIAGNOSIS
ATC-57
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AT C
3.CHECK POWER SUPPLY FOR MOTOR SIDE
OK or NG
OK >> GO TO 4.
NG >> Replace harness or connector.
4.CHECK SIGNAL FOR MOTOR SIDE
OK or NG
OK >> GO TO 5.
NG >> Replace harness or connector.
5.CHECK MOTOR GROUND CIRCUIT
OK or NG
OK >> GO TO 6.
NG >> Replace harness or connector.
6.CHECK MOTOR OPERATION
Disconnect and reconnect the motor connector and confirm the motor operation.
OK or NG
OK >> (Return to operate normally.)
lPoor contacting the motor connector
NG >> (Does not operate normally.)
lGO TO 7
Door motorTe r m i n a l s
Voltag e (+)
(-)
ConnectorTe r m i n a l
(Wire color)
Mode M37 1 (L/R)
Body groundApprox.
12V Air mix M38 1 (L/R)
Intake M47 1 (L/R)
RJIA0509E
Door motorTe r m i n a l s
Vo l ta g e (+)
(-)
ConnectorTe r m i n a l
(Wire color)
Mode M37 3 (L)
Body groundApprox.
5.5V Air mix M38 3 (L)
Intake M47 3 (L)
RJIA0610E
Door motorTe r m i n a l s
Continuity (+)
(-)
ConnectorTe r m i n a l
(Wire color)
Mode M37 2 (B)
Body ground Yes Air mix M38 2 (B)
Intake M47 2 (B)
RJIA0511E

ATC-58
TROUBLE DIAGNOSIS
7.CHECK MODE DOOR MOTOR OPERATION
1. Disconnect mode door motor and air mix door motor connector.
2. Reconnect mode door motor connector and confirm the mode door motor operation.
OK or NG
OK >> (Mode door motor operates normally.)
lGO TO 8
NG >> (Mode door motor does not operate normally.)
lReplace the mode door motor.
8.CHECK AIR MIX DOOR MOTOR OPERATION
1. Disconnect mode door motor connector.
2. Reconnect air mix door motor connector and confirm the air mix door motor operation.
OK or NG
OK >> (Air mix door motor operates normally.)
lGO TO 9
NG >> (Air mix door motor does not operate normally.)
lReplace the air mix door motor.
9.CHECK INTAKE DOOR MOTOR OPERATION
1. Disconnect air mix door motor connector.
2. Reconnect intake door motor connector and confirm the intake door motor operation.
OK or NG
OK >> (Intake door motor operates normally.)
lReplace auto amp.
NG >> (Intake door motor does not operate normally.)
lReplace intake door motor.
Mode Door Motor CircuitEJS001H1
SYMPTOM:
lAir outlet does not change.
lMode door motor does not operate normally.

TROUBLE DIAGNOSIS
ATC-59
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MA
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AT C
INSPECTION FLOW
*1 Discharge air flowAT C - 2 8*7 Sunload sensor circuitAT C -9 8*13 Symptom tableAT C - 3 0
*2 Operational checkAT C -5 1*8 Air mix door motor circuitAT C -6 1*14 Intake sensor circuitAT C - 1 0 8
*3 Self-diagnosisAT C - 4 2, see No.1 *9 Self-diagnosisAT C - 4 2,seeNo.14
*4 Self-diagnosisAT C - 4 2
, see No. 5 *10 LAN system circuitAT C -4 2
*5 Ambient sensor circuitAT C - 9 3*11 Component description for Mode door
AT C -6 1
*6 In-vehicle sensor circuitAT C - 9 5*12 Operational checkAT C - 5 1
RJIA0512E

ATC-60
TROUBLE DIAGNOSIS
SYSTEM DESCRIPTION
Component Parts
Mode door control system components are:
lAuto amp.
lMode door motor (LCU)
lA/C LAN system (PBR built-in air mix door motor, mode door motor and intake door motor)
lIn-vehicle sensor
lAmbient sensor
lSunload sensor
lIntake sensor
System Operation
The auto amplifier receives data from each of the sensors. The amplifier sends air mix door, mode door and
intake door opening angle data to the air mix door motor LCU, mode door motor LCU and intake door motor
LCU.
The air mix door motor, mode door motor and intake door motor read their respective signals according to the
address signal. Opening angle indication signals received from the auto amplifier and each of the motor posi-
tion sensors are compared by the LCUs in each motor with the existing decision and opening angles. Subse-
quently, HOT/COLD or DEFROST/VENT or FRESH/RECIRCULATION operation is selected. The new
selection data is returned to the auto amplifier.
Mode Door Control Specification
RHA045HA
RHA384HA

TROUBLE DIAGNOSIS
ATC-61
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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-62
TROUBLE DIAGNOSIS
INSPECTION FLOW
SYSTEM DESCRIPTION
Component Parts
Air mix door control system components are:
lAuto amp.
lAir mix door motor (LCU)
lA/C LAN system (PBR built-in air mix door motor, mode door motor and intake door motor)
*1 Self-diagnosisAT C - 4 2, see No.1 *6 Self-diagnosisAT C -4 2, see No. 14. *11 Intake sensor circuitATC-101
*2 Ambient sensor circuitAT C - 9 3*7 LAN system circuitAT C - 5 6*12 Self-diagnosisAT C - 4 2,seeNo.7
*3 In-vehicle sensor circuitAT C - 9 5
*8 Operational checkAT C - 5 1
*4 Sunload sensor circuitAT C - 9 8*9 Operational checkAT C - 5 1
*5 Air mix door motor circuitAT C - 6 1*10 Symptom tableAT C - 3 0
RJIA0515E