Nissan Pathfinder (2005 year). Instruction — part 53
TROUBLE DIAGNOSIS
ATC-71
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ATC
2005 Pathfinder
7.
CHECK PBR FEEDBACK CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect the air mix door motor (rear) connector and front air
control connector.
3.
Check continuity between air mix door motor (rear) harness con-
nector B155 terminal 4 and front air control harness connector
M49 terminal 25.
OK or NG
OK
>> Replace air mix door motor (rear). Refer to
.
NG
>> Repair or replace harness as necessary.
4 - 25
Continuity should exist.
WJIA1106E
ATC-72
TROUBLE DIAGNOSIS
2005 Pathfinder
Intake Door Motor Circuit
EJS002X5
SYMPTOM:
●
Intake door does not change.
●
Intake door motor does not operate normally.
INSPECTION FLOW
*1
ATC-52, "Operational Check
(Front)"
*2
ATC-50, "A/C System Self-diagno-
sis Function"
*3
ATC-51, "SELF-DIAGNOSIS CODE
CHART"
WJIA1053E
TROUBLE DIAGNOSIS
ATC-73
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ATC
2005 Pathfinder
SYSTEM DESCRIPTION
Component Parts
Intake door control system components are:
●
Front air control
●
Intake door motor
●
In-vehicle sensor
●
Ambient sensor
●
Optical sensor
●
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.
In the AUTO mode, the front air control determines the intake door position based on the ambient tempera-
ture, the intake air temperature and the in-vehicle temperature. When the DEFROST, or OFF switches are
pushed or A/C switch is OFF, the front air control sets the intake door at the fresh position.
Intake Door Control Specification
WJIA1352E
WJIA0436E
ATC-74
TROUBLE DIAGNOSIS
2005 Pathfinder
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.
DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR
1.
CHECK RESULT FROM FRONT AIR CONTROL SELF-DIAGNOSIS
Self-diagnosis code 72 is present. Refer to
ATC-50, "A/C System Self-diagnosis Function"
.
YES or NO
YES
>> GO TO 2.
NO
>> Replace front air control. Refer to
.
2.
CHECK POWER SUPPLY CIRCUIT FOR INTAKE DOOR MOTOR
1.
Turn ignition switch OFF.
2.
Disconnect front air control connector and intake door motor
connector.
3.
Check continuity between front air control harness connector
M49 terminal 5 and intake door motor harness connector M58
terminal 6 and between front air control harness connector M49
terminal 4 and intake door motor harness connector M58 termi-
nal 1.
OK or NG
OK
>> Replace intake door motor. Refer to
.
NG
>> Repair or replace harness as necessary.
WJIA1107E
5 - 6
Continuity should exist.
4 - 1
Continuity should exist.
WJIA1250E
TROUBLE DIAGNOSIS
ATC-75
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ATC
2005 Pathfinder
Front Blower Motor Circuit
EJS002X7
SYMPTOM:
●
Blower motor operation is malfunctioning.
●
Blower motor operation is malfunctioning under cold starting conditions.
INSPECTION FLOW
*1
.
*2
ATC-50, "A/C System Self-diagnosis
Function"
.
*3
ATC-51, "SELF-DIAGNOSIS CODE
CHART"
.
*4
ATC-77, "DIAGNOSTIC PROCE-
DURE FOR BLOWER MOTOR"
*5
*6
EC-204, "DTC P0117, P0118 ECT
SENSOR"
WJIA1463E
ATC-76
TROUBLE DIAGNOSIS
2005 Pathfinder
SYSTEM DESCRIPTION
Component Parts
Blower speed control system components are:
●
Front air control
●
In-vehicle sensor
●
Ambient sensor
●
Optical sensor
●
Intake sensor
System Operation
Automatic Mode
In the automatic mode, the blower motor speed is calculated by the front air control and variable blower control
based on input from the in-vehicle sensor, optical sensor, intake sensor and ambient sensor, and potentio tem-
perature control (PTC).
When the air flow is increased, the blower motor speed is adjusted gradually. to prevent a sudden increase in
air flow.
In addition to instruction air flow control and the usual automatic air flow control, starting air flow control, low
water temperature starting control and high passenger compartment temperature starting control are avail-
able.
Starting Blower Speed Control
Start up from cold soak condition (Automatic mode).
In a cold start up condition where the engine coolant temperature is below 50
°
C (122
°
F), the blower will not
operate at blower speed 1 for a short period of time (up to 210 seconds). The exact start delay time varies
depending on the ambient and engine coolant temperatures.
In the most extreme case (very low ambient temperature) the blower starting delay will be 210 seconds as
described above. After the coolant temperature reaches 50
°
C (122
°
F), or the 210 seconds has elapsed, the
blower speed will increase to the objective blower speed.
Start up from usual operating or hot soak condition (Automatic mode).
The blower will begin operation momentarily after the AUTO switch is pushed. The blower speed will gradually
rise to the objective speed over a time period of 3 seconds or less (actual time depends on the objective
blower speed).
WJIA1252E
TROUBLE DIAGNOSIS
ATC-77
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ATC
2005 Pathfinder
Blower Speed Compensation - Sunload
When the in-vehicle temperature and the set temperature are very close, the blower will be operating at low
speed. The speed will vary depending on the sunload. During conditions of low or no sunload, the blower
operates at low speed. During high sunload conditions, the front air control causes the blower speed to
increase.
Blower Speed Control Specification
COMPONENT DESCRIPTION
Variable Blower Control
The variable blower control is located on the cooling unit. The vari-
able blower control receives a gate voltage from the front air control
to steplessly maintain the blower motor voltage in the 0 to 5 volt
range (approx.).
DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR
SYMPTOM: Blower motor operation is malfunctioning under starting
blower speed control.
WJIA0441E
WJIA1111E
WJIA1112E
ATC-78
TROUBLE DIAGNOSIS
2005 Pathfinder
1.
CHECK FUSES
Check 15A fuses [No. 24 and 27, (located in the fuse and fusible link box)]. For fuse layout, refer to
.
OK or NG
OK
>> GO TO 2.
NG
>> GO TO 10.
2.
CHECK FRONT BLOWER MOTOR POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect front blower motor connector.
3.
Turn ignition switch OFF.
4.
Turn the front blower control dial to select any mode except off.
5.
Check voltage between front blower motor harness connector
M62 terminal 1 and ground.
OK or NG
OK
>> GO TO 12.
NG
>> GO TO 3.
3.
CHECK FRONT BLOWER MOTOR RELAY (SWITCH SIDE) POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect front blower motor relay.
3.
Check voltage between front blower motor relay harness con-
nector E22 terminals 3 and 6 and ground.
OK or NG
OK
>> GO TO 4.
NG
>> Repair harness or connector.
4.
CHECK FRONT BLOWER MOTOR RELAY
Refer to
ATC-81, "Front Blower Motor Relay"
.
OK or NG
OK
>> GO TO 5.
NG
>> Replace front blower motor relay.
5.
CHECK FRONT BLOWER MOTOR RELAY (SWITCH SIDE) CIRCUIT FOR OPEN
1.
Turn ignition switch OFF.
2.
Disconnect blower motor relay connector and front blower motor
connector.
3.
Check continuity between front blower motor relay harness con-
nector E22 terminals 5 and 7
and front blower motor harness connector M62 terminal 1.
OK or NG
OK
>> GO TO 6.
NG
>> Repair harness or connector.
Fuses are good.
1 - Ground
: Battery voltage.
WJIA1257E
3, 6 - Ground
: Battery voltage.
WJIA1258E
5, 7 - 1
: Continuity should exist.
WJIA1259E
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