Nissan Pathfinder (2006 year). Manual — part 336
TROUBLE DIAGNOSIS
MTC-41
C
D
E
F
G
H
I
K
L
M
A
B
MTC
2006 Pathfinder
If NG, listen for sound of air mix door motor operation. If OK, go to trouble diagnosis procedure for
. If air mix door motor (front) appears to be malfunctioning, go to
PROCEDURE FOR AIR MIX DOOR MOTOR (FRONT)"
If OK, continue with next check.
CHECK A/C SWITCH
1.
Press A/C switch with the blower switch ON.
2.
A/C switch indicator will turn ON.
●
Confirm that the compressor clutch engages (sound or visual inspection).
If NG, go to trouble diagnosis procedure for
MTC-65, "Magnet Clutch Circuit"
If OK, continue with next check.
MTC-42
TROUBLE DIAGNOSIS
2006 Pathfinder
Power Supply and Ground Circuit for Front Air Control
EJS004RM
SYMPTOM: A/C system does not come on.
INSPECTION FLOW
*1
MTC-43, "DIAGNOSTIC PROCE-
DURE FOR A/C SYSTEM"
*2
ATC-53, "Operational Check (Front)"
WJIA1498E
TROUBLE DIAGNOSIS
MTC-43
C
D
E
F
G
H
I
K
L
M
A
B
MTC
2006 Pathfinder
COMPONENT DESCRIPTION
Front Air Control
The front air control 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, defroster door motor, blower motor and compressor are then
controlled.
The front air control is unitized with control mechanisms. When the
various switches and temperature dials are operated, data is input to
the front air control.
Potentio Temperature Control (PTC)
The PTC is built into the front air control. It can be set from cold to
hot or any intermediate position by rotating the temperature dial.
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM
SYMPTOM: A/C system does not come on.
WJIA1302E
WJIA1311E
WJIA1461E
MTC-44
TROUBLE DIAGNOSIS
2006 Pathfinder
1.
CHECK POWER SUPPLY CIRCUITS FOR FRONT AIR CONTROL
1.
Turn ignition switch OFF.
2.
Disconnect front air control connector.
3.
Turn ignition switch ON.
4.
Check voltage between front air control harness connector M49
terminals 6 and 19, and ground.
OK or NG
OK
>> GO TO 2.
NG
>> Check 10A fuses [Nos. 8 and 19, located in the fuse block (J/B)]. Refer to
●
If fuses are OK, check harness for open circuit. Repair or replace as necessary.
●
If fuses are NG, replace fuse and check harness for short circuit. Repair or replace as neces-
sary.
2.
CHECK GROUND CIRCUIT FOR FRONT AIR CONTROL
1.
Turn ignition switch OFF.
2.
Check continuity between front air control harness connector
M49 terminal 20 and ground.
OK or NG
OK
>> Replace front air control. Refer to
.
NG
>> Repair harness or connector.
Terminals
Ignition switch position
(+)
(-)
OFF
ACC
ON
Front air
control
connector
Terminal No.
M49
6
Ground
Approx. 0V
Approx. 0V
Battery
voltage
M49
19
Battery
voltage
Battery
voltage
Battery
voltage
WJIA1082E
20 - Ground
: Continuity should exist.
WJIA1239E
TROUBLE DIAGNOSIS
MTC-45
C
D
E
F
G
H
I
K
L
M
A
B
MTC
2006 Pathfinder
Mode Door Motor Circuit
EJS004RN
SYMPTOM:
●
Air outlet does not change.
●
Mode door motor does not operate normally.
INSPECTION FLOW
SYSTEM DESCRIPTION
Component Parts
Mode door control system components are:
●
Front air control
*1
*2
ATC-53, "Operational Check
(Front)"
*3
ATC-61, "DIAGNOSTIC PROCE-
DURE FOR MODE DOOR MOTOR"
*4
*5
WJIA1630E
MTC-46
TROUBLE DIAGNOSIS
2006 Pathfinder
●
Mode door motor
●
PBR (built into mode door motor)
●
Intake sensor
System Operation
The mode door position (vent, B/L, foot, D/F, and defrost) is set by the front air control by means of the mode
door motor. When a mode door position is selected on the front air control, voltage is applied to one circuit of
the mode door motor while ground is applied to the other circuit, causing the mode door motor to rotate. The
direction of rotation is determined by which circuit has voltage applied to it, and which one has ground applied
to it. The front air control monitors the mode door position by measuring the voltage signal on the PBR circuit.
COMPONENT DESCRIPTION
Mode Door Motor
The mode door motor is attached to the heater and cooling unit
assembly. It rotates so that air is discharged from the outlet as indi-
cated by the front air control. Motor rotation is conveyed to a link
which activates the mode door.
WJIA1314E
WJIA1484E
TROUBLE DIAGNOSIS
MTC-47
C
D
E
F
G
H
I
K
L
M
A
B
MTC
2006 Pathfinder
DIAGNOSTIC PROCEDURE FOR MODE DOOR MOTOR
1.
CHECK POWER SUPPLY AND GROUND CIRCUITS FOR MODE DOOR MOTOR
1.
Turn ignition switch OFF.
2.
Disconnect front air control connector and mode door motor
connector.
3.
Check continuity between front air control harness connector
M49 terminal 1 and mode door motor harness connector M142
terminal 1 and between front air control harness connector M49
terminal 14 and mode door motor harness connector M142 ter-
minal 6.
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace harness as necessary.
2.
CHECK PBR REFERENCE SIGNAL VOLTAGE
1.
Reconnect the front air control connector.
2.
Turn ignition switch ON.
3.
Check voltage between mode door motor harness connector
M142 terminal 3 and ground.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 3.
3.
CHECK PBR REFERENCE VOLTAGE CIRCUIT BETWEEN MODE DOOR AND FRONT AIR CONTROL
1.
Turn ignition switch OFF.
2.
Disconnect the front air control connector.
3.
Check continuity between mode door motor harness connector
M142 terminal 3 and front air control harness connector M49 ter-
minal 23.
OK or NG
OK
>> Replace front air control. Refer to
.
NG
>> Repair or replace harness as necessary.
1 - 1
: Continuity should exist.
14 - 6
: Continuity should exist.
WJIA1241E
3 - Ground
: Approx. 5V
WJIA1242E
3 - 23
: Continuity should exist.
WJIA1085E
MTC-48
TROUBLE DIAGNOSIS
2006 Pathfinder
4.
CHECK PBR GROUND REFERENCE CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect the front air control connector.
3.
Check continuity between mode door motor harness connector
M142 terminal 2 and front air control harness connector M49 ter-
minal 26.
OK or NG
OK
>> GO TO 5.
NG
>> Repair or replace harness as necessary.
5.
CHECK PBR FEEDBACK SIGNAL
1.
Reconnect the front air control connector and mode door motor
connector.
2.
Turn ignition switch ON.
3.
Check voltage between front air control harness connector M49
terminal 21 and ground.
4.
Press mode switch through all modes.
OK or NG
OK
>> Replace front air control. Refer to
.
NG
>> GO TO 6.
6.
CHECK PBR FEEDBACK CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect the mode door motor connector and front air control
harness connector.
3.
Check continuity between mode door motor harness connector
M142 terminal 4 and front air control harness connector M49 ter-
minal 21.
OK or NG
OK
>> Replace mode door motor. Refer to
NG
>> Repair or replace harness as necessary.
2 - 26
: Continuity should exist.
WJIA1087E
21 - Ground
: Approx. 0 - 5V
WJIA1088E
4 - 21
: Continuity should exist.
WJIA1089E
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст