Nissan Pathfinder (2007 year). Instruction — part 325
TROUBLE DIAGNOSIS
MTC-47
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MTC
2007 Pathfinder
Air Mix Door Motor Circuit
EJS004RO
SYMPTOM:
●
Discharge air temperature does not change.
●
Air mix door motor does not operate.
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE
1.
Blower must be on (1, 2, 3, 4).
2.
Turn the temperature control dial clockwise to maximum heat.
3.
Check for hot air at discharge air outlets.
>> GO TO 2.
2.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE DECREASE
1.
Turn the temperature control dial counterclockwise to maximum cold.
2.
Check for cold air at discharge air outlets.
Can a symptom be duplicated?
YES
>> GO TO 4.
NO
>> GO TO 3.
3.
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.
4.
CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 5.
5.
CHECK AIR MIX DOOR OPERATION
Check and verify air mix door mechanism for smooth operation from maximum cold to maximum heat in each
mode.
OK or NG
OK
>> GO TO 6.
NG
>> Repair as necessary.
6.
CHECK THE AIR MIX DOOR MOTOR PBR CIRCUIT
Perform diagnostic procedure for the air mix door motor. Refer to
ATC-63, "Air Mix Door Motor Circuit"
.
OK or NG
OK
>> GO TO 7.
NG
>> Repair PBR circuit or replace air mix door motor. Refer to
MTC-48
TROUBLE DIAGNOSIS
2007 Pathfinder
7.
RECHECK FOR ANY SYMPTOMS
Perform a complete operational check for any symptoms. Refer to
ATC-52, "Operational Check (Front)"
.
Does another symptom exist?
YES
>> Refer to
.
NO
TROUBLE DIAGNOSIS
MTC-49
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2007 Pathfinder
SYSTEM DESCRIPTION
Component Parts
Air mix door control system components are:
●
Front air control
●
Air mix door motor (front)
●
PBR (built into air mix door motor)
●
Intake sensor
System Operation
The front air control receives data from the temperature selected by the driver. The front air control then
applies a voltage to one circuit of the air mix door motor, while ground is applied to the other circuit, causing
the air mix 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 air mix door positions by measur-
ing the voltage signal on the PBR circuits of each door.
Air Mix Door Control Specification
COMPONENT DESCRIPTION
Air Mix Door Motors
The air mix door motor is attached to the front heater and cooling
unit assembly. This motor rotates so that the air mix door is opened
or closed to a position set by the front air control. Motor rotation is
then conveyed through a shaft and the air mix door position is then
fed back to the front air control by the PBR built into the air mix door
motor.
WJIA1316E
WJIA0435E
WJIA1485E
MTC-50
TROUBLE DIAGNOSIS
2007 Pathfinder
DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR (FRONT)
1.
CHECK POWER SUPPLY CIRCUITS FOR AIR MIX DOOR MOTOR
1.
Turn ignition switch OFF.
2.
Disconnect front air control connector and air mix door motor
(front) connector.
3.
Check continuity between front air control harness connector
M49 terminal 2 and 3 and air mix door motor (front) harness
connector M147 terminal 6 and 5.
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 air mix door motor (front) harness con-
nector M147 terminal 1 and ground.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 3.
3.
CHECK PBR REFERENCE VOLTAGE CIRCUIT BETWEEN AIR MIX DOOR MOTOR (FRONT) AND
FRONT AIR CONTROL
1.
Turn ignition switch OFF.
2.
Disconnect the front air control connector.
3.
Check continuity between air mix door motor (front) harness
connector M147 (B) terminal 1 and front air control harness con-
nector M49 (A) terminal 23.
OK or NG
OK
>> Replace front air control. Refer to
NG
>> Repair or replace harness as necessary.
2 - 6
: Continuity should exist.
3 - 5
: Continuity should exist.
WJIA1318E
1 - Ground
: Approx. 5V
WJIA1319E
A
B
Connector
Terminal Connector
Terminal
Continuity
Front air control:
M49
23
Air mix door motor
(front): M143
1
Yes
WJIA1656E
TROUBLE DIAGNOSIS
MTC-51
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MTC
2007 Pathfinder
4.
CHECK PBR GROUND REFERENCE CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect the front air control connector.
3.
Check continuity between air mix door motor (front) harness
connector M147 terminal 3 and front air control harness connec-
tor M49 terminal 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 air mix door motor
(front) connector.
2.
Turn ignition switch ON.
3.
Check voltage between front air control harness connector M49
terminal 22 and ground.
4.
Rotate temperature control dial through complete range.
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 air mix door motor (front) connector and front air
control connector.
3.
Check continuity between air mix door motor (front) harness
connector M147 terminal 2 and front air control harness connec-
tor M49 terminal 22.
OK or NG
OK
>> Replace air mix door motor (front). Refer to
NG
>> Repair or replace harness as necessary.
3 - 26
: Continuity should exist.
WJIA1320E
22 - Ground
: Approx. 0V - 5V
WJIA1096E
2 - 22
: Continuity should exist.
WJIA1321E
MTC-52
TROUBLE DIAGNOSIS
2007 Pathfinder
Intake Door Motor Circuit
EJS004RP
SYMPTOM:
●
Intake door does not change.
●
Intake door motor does not operate normally.
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - REC (
)
1.
Turn blower control dial to 4.
2.
Turn mode dial to vent mode (
).
3.
Press REC (
) switch.
4.
Press REC (
) switch again.
5.
Listen for intake door position change (you should hear blower sound change slightly).
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 INTAKE DOOR OPERATION
Check and verify intake door mechanism for smooth operation.
OK or NG
OK
>> GO TO 5.
NG
>> Repair intake door mechanism.
5.
RECHECK FOR ANY SYMPTOMS
Perform a complete operational check for any symptoms. Refer to
ATC-52, "Operational Check (Front)"
.
Does another symptom exist?
YES
>> Refer to
.
NO
TROUBLE DIAGNOSIS
MTC-53
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MTC
2007 Pathfinder
SYSTEM DESCRIPTION
Component Parts
Intake door control system components are:
●
Front air control
●
Intake door motor
●
Intake sensor
System Operation
The intake door control determines the intake door position based on the position of the recirculation switch.
When the recirculation switch is depressed the intake door motor rotates closing off the fresh air inlet and
recirculating the cabin air. If the recirculation switch is depressed again, the intake door motor rotates in the
opposite direction, again allowing fresh air into the cabin.
COMPONENT DESCRIPTION
Intake door motor
The intake door motor is attached to the intake unit. It rotates so that
air is drawn from inlets set by the front air control. Motor rotation is
conveyed to a lever which activates the intake door.
WJIA1478E
WJIA1486E
MTC-54
TROUBLE DIAGNOSIS
2007 Pathfinder
DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR
1.
CHECK INTAKE DOOR MOTOR CIRCUIT VOLTAGE
1.
Turn ignition switch OFF.
2.
Disconnect intake door motor connector.
3.
Turn ignition switch ON.
4.
Rotate the temperature control dial counterclockwise.
5.
Check voltage between intake door motor harness connector
M58 terminal 6 and ground.
OK or NG
OK
>> GO TO 3.
NG
>> GO TO 2.
2.
CHECK INTAKE DOOR MOTOR CIRCUIT FOR OPEN
1.
Turn ignition switch OFF.
2.
Disconnect front air control connector.
3.
Check continuity between front air control harness connector
M49 terminal 5 and intake door motor harness connector M58
terminal 6.
OK or NG
OK
>> Replace front air control connector. Refer to
NG
>> Repair or replace harness as necessary.
3.
CHECK INTAKE DOOR MOTOR CIRCUIT VOLTAGE
1.
Rotate the temperature control dial clockwise.
2.
Check voltage between intake door motor harness connector
M58 terminal 1 and ground.
OK or NG
OK
>> Replace intake door motor. Refer to
NG
>> GO TO 4.
6 - Ground
: Battery voltage
WJIA1324E
5 - 6
: Continuity should exist.
WJIA1468E
1 - Ground
:Battery voltage
WJIA1326E
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