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Nissan Pathfinder (2005 year). Manual - part 53

TROUBLE DIAGNOSIS

ATC-71

ATC

2005 Pathfinder

CHECK PBR FEEDBACK CIRCUIT

Turn ignition switch OFF.

Disconnect the air mix door motor (rear) connector and front air
control connector.

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

>> Replace air mix door motor (rear). Refer to

ATC-143,

"REAR AIR MIX DOOR MOTOR"

>> 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

ATC-52, "Operational Check
(Front)"

ATC-50, "A/C System Self-diagno-
sis Function"

ATC-51, "SELF-DIAGNOSIS CODE
CHART"

WJIA1053E

TROUBLE DIAGNOSIS

ATC-73

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

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.

>> Replace front air control. Refer to

ATC-124, "FRONT AIR CONTROL"

CHECK POWER SUPPLY CIRCUIT FOR INTAKE DOOR MOTOR

Turn ignition switch OFF.

Disconnect front air control connector and intake door motor
connector.

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

>> Replace intake door motor. Refer to

ATC-140, "INTAKE DOOR MOTOR"

>> Repair or replace harness as necessary.

WJIA1107E

5 - 6

Continuity should exist.

4 - 1

Continuity should exist.

WJIA1250E

TROUBLE DIAGNOSIS

ATC-75

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

ATC-52, "Operational Check

(Front)"

ATC-50, "A/C System Self-diagnosis
Function"

ATC-51, "SELF-DIAGNOSIS CODE
CHART"

ATC-77, "DIAGNOSTIC PROCE-
DURE FOR BLOWER MOTOR"

ATC-35, "SYMPTOM TABLE"

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 manual 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

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

CHECK FUSES

Check 15A fuses [No. 24 and 27, (located in the fuse and fusible link box)]. For fuse layout, refer to

PG-80,

"FUSE AND FUSIBLE LINK BOX"

OK or NG

>> GO TO 2.

>> GO TO 10.

CHECK FRONT BLOWER MOTOR POWER SUPPLY CIRCUIT

Turn ignition switch OFF.

Disconnect front blower motor connector.

Turn ignition switch OFF.

Turn the front blower control dial to select any mode except off.

Check voltage between front blower motor harness connector
M62 terminal 1 and ground.

OK or NG

>> GO TO 12.

>> GO TO 3.

CHECK FRONT BLOWER MOTOR RELAY (SWITCH SIDE) POWER SUPPLY CIRCUIT

Turn ignition switch OFF.

Disconnect front blower motor relay.

Check voltage between front blower motor relay harness con-
nector E22 terminals 3 and 6 and ground.

OK or NG

>> GO TO 4.

>> Repair harness or connector.

CHECK FRONT BLOWER MOTOR RELAY

Refer to

ATC-81, "Front Blower Motor Relay"

OK or NG

>> GO TO 5.

>> Replace front blower motor relay.

CHECK FRONT BLOWER MOTOR RELAY (SWITCH SIDE) CIRCUIT FOR OPEN

Turn ignition switch OFF.

Disconnect blower motor relay connector and front blower motor
connector.

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

>> GO TO 6.

>> 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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