Nissan Pathfinder (2007 year). Manual — part 324
TROUBLE DIAGNOSIS
MTC-39
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MTC
2007 Pathfinder
Operational Check
EJS004RL
The purpose of the operational check is to confirm that the system operates properly.
CHECKING BLOWER
1.
Turn blower control dial clockwise. Blower should operate on low speed.
2.
Turn the blower control dial again, and continue checking each blower speed until all speeds are checked.
3.
Leave blower on speed 4.
If NG, go to trouble diagnosis procedure for
MTC-56, "Front Blower Motor Circuit"
If OK, continue with next check.
CHECKING DISCHARGE AIR
1.
Turn the mode switch to each position.
2.
Confirm that discharge air comes out according to the air distribution table. Refer to
Mode door position is checked in the next step.
If NG, go to trouble diagnosis procedure for
MTC-43, "Mode Door Motor Circuit"
If OK, continue with next check.
NOTE:
Confirm that the A/C compressor clutch is engaged (sound or visual inspection) and intake door position is at
fresh when the DEF (
) or D/F (
) is selected.
CHECKING RECIRCULATION
1.
Press recirculation (
) switch one time. Recirculation indicator should illuminate.
2.
Press recirculation (
) switch one more time. Recirculation indicator should go off.
3.
Listen for intake door position change (blower sound should change slightly).
If NG, go to trouble diagnosis procedure for
MTC-52, "Intake Door Motor Circuit"
If OK, continue with next check.
NOTE:
Confirm that the compressor clutch is engaged (sound or visual inspection) and intake door position is at fresh
when the DEF or D/F is selected.
CHECKING TEMPERATURE DECREASE
1.
Rotate temperature control dial counterclockwise.
2.
Check for cold air at appropriate discharge air outlets.
If NG, listen for sound of air mix door motor operation if OK, go to trouble diagnosis procedure for
. If air mix door motor appears to be malfunctioning, go to
CEDURE FOR AIR MIX DOOR MOTOR (FRONT)"
.
If OK, continue with next check.
CHECKING TEMPERATURE INCREASE
1.
Rotate temperature control dial clockwise.
2.
Check for hot air at appropriate discharge air outlets.
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-64, "Magnet Clutch Circuit"
If OK, continue with next check.
Conditions
: Engine running and at normal operating temperature
MTC-40
TROUBLE DIAGNOSIS
2007 Pathfinder
Power Supply and Ground Circuit for Front Air Control
EJS004RM
SYMPTOM: A/C system does not come on.
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK
1.
Turn blower control dial to position 1-4, then press A/C switch.
2.
Confirm that the compressor clutch engages (sound or visual inspection).
Can a symptom be duplicated?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
PERFORM COMPLETE OPERATIONAL CHECK
Perform a complete operational check and check for any symptoms. Refer to
.
Can a symptom be duplicated?
YES
>> Refer to
.
NO
>> System OK.
3.
CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4.
4.
CHECK POWER AND GROUND CIRCUIT
Check main power supply and ground circuit. Refer to
ATC-56, "DIAGNOSTIC PROCEDURE FOR A/C SYS-
.
OK or NG
OK
>> System OK.
NG
TROUBLE DIAGNOSIS
MTC-41
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2007 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-42
TROUBLE DIAGNOSIS
2007 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-43
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MTC
2007 Pathfinder
Mode Door Motor Circuit
EJS004RN
SYMPTOM:
●
Air outlet does not change.
●
Mode door motor does not operate normally.
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - DISCHARGE AIR
1.
Turn blower control dial to 4.
2.
Turn the mode dial and check all positions.
3.
Confirm that discharge air comes out according to the air distribution table. Refer to
NOTE:
Confirm that the compressor clutch is engaged (visual inspection) and intake door position is at FRESH
when DEF (
) or D/F (
) is selected.
Can a symptom be duplicated?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
PERFORM COMPLETE OPERATIONAL CHECK
Perform a complete operational check and check for any symptoms. Refer to
Can a symptom be duplicated?
YES
>> Refer to
NO
>> System OK.
3.
CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4.
4.
CHECK MODE DOOR OPERATION
Check and verify mode door mechanism for smooth operation in each mode.
OK or NG
OK
>> GO TO 5.
NG
>> Repair as necessary.
5.
CHECK THE MODE DOOR MOTOR PBR CIRCUIT
Perform diagnostic procedure for the mode door motor. Refer to
ATC-61, "DIAGNOSTIC PROCEDURE FOR
OK or NG
OK
>> GO TO 6.
NG
>> Repair PBR circuit or replace motor.
6.
RECHECK FOR SYMPTOMS
Perform a complete operational check and check for any symptoms. Refer to
Does another symptom exist?
YES
>> Repair as necessary.
NO
>> Replace front air control. Refer to
.
MTC-44
TROUBLE DIAGNOSIS
2007 Pathfinder
SYSTEM DESCRIPTION
Component Parts
Mode door control system components are:
●
Front air control
●
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-45
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MTC
2007 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-46
TROUBLE DIAGNOSIS
2007 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
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