Nissan Pathfinder (2006 year). Instruction — part 51

TROUBLE DIAGNOSIS

ATC-73

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ATC

2006 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

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2006 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

Is self-diagnosis code 72 is present. Refer to

ATC-51, "A/C System Self-diagnosis Function"

.

YES or NO

YES

>> GO TO 2.

NO

>> Replace front air control. Refer to

ATC-127, "FRONT AIR CONTROL"

.

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

ATC-143, "INTAKE DOOR MOTOR"

.

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

2006 Pathfinder

Front Blower Motor Circuit

EJS004P8

SYMPTOM:

●

Blower motor operation is malfunctioning.

INSPECTION FLOW

*1

.

ATC-53, "Operational Check

(Front)"

*2

ATC-51, "A/C System Self-diagnosis
Function"

*3

ATC-52, "SELF-DIAGNOSIS CODE
CHART"

*4

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

*5

EC-207, "DTC P0117, P0118 ECT
SENSOR"

*6

ATC-36, "SYMPTOM TABLE"

WJIA1251E

ATC-76

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2006 Pathfinder

SYSTEM DESCRIPTION
Component Parts

Blower speed control system components are:

●

Front air control

●

Front blower motor relay

●

Front blower motor

●

Variable blower 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).

WJIA1788E

TROUBLE DIAGNOSIS

ATC-77

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ATC

2006 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

WJIA1657E

ATC-78

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2006 Pathfinder

1.

CHECK FUSES

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

PG-84,

"FUSE AND FUSIBLE LINK BOX"

.

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 ON.

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 5 and 7 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.

Fuses are good.

1 - Ground

: Battery voltage

WJIA1980E

A

Connector

(+)

(-)

Condition

Voltage

(Approx.)

Front blower motor

relay: E22

5

Ground

Front

blower

motor relay

power

supply

Battery
voltage

Front blower motor

relay: E22

7

Front

blower

motor relay

power

supply

Battery

Voltage

WJIA1658E

TROUBLE DIAGNOSIS

ATC-79

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ATC

2006 Pathfinder

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 (A) terminals 3 and 6
and front blower motor harness connector M62 (B) terminal 1.

OK or NG

OK

>> GO TO 6.

NG

>> Repair harness or connector.

6.

CHECK VARIABLE BLOWER CONTROL POWER SUPPLY CIRCUIT FOR OPEN

1.

Disconnect variable blower control harness connector.

2.

Check continuity between front blower motor relay harness con-
nector E22 (A) terminals 3 and 6 and variable blower control
harness connector M122 (B) terminal 1.

OK or NG

OK

>> GO TO 7.

NG

>> Repair harness or connector.

7.

CHECK VARIABLE BLOWER CONTROL SIGNAL CIRCUIT

1.

Disconnect front air control connector.

2.

Check continuity between front air control harness connector
M50 terminal 32 and variable blower control harness connector
M122 terminal 2.

OK or NG

OK

>> GO TO 8.

NG

>> Repair harness or connector.

A

B

Connector

Terminal Connector

Terminal

Continuity

Front blower motor

relay: E22

3

Front blower

motor: M62

1

Yes

Front blower motor

relay: E22

6

Front blower

motor: M62

1

Yes

WJIA1659E

A

B

Connector

Terminal Connector

Terminal

Continuity

Front blower motor

relay: E22

3

Variable blower

control: M122

1

Yes

Front blower motor

relay: E22

6

Front blower
motor: M122

1

Yes

WJIA1660E

32 - 2

: Continuity should exist.

WJIA1263E

ATC-80

TROUBLE DIAGNOSIS

2006 Pathfinder

8.

CHECK FRONT BLOWER MOTOR RELAY (COIL SIDE) POWER SUPPLY

1.

Turn ignition switch ON.

2.

Check voltage between front blower motor relay connector E22
terminal 1 and ground.

OK or NG

OK

>> GO TO 9.

NG

>> Repair harness or connector.

9.

CHECK FRONT BLOWER MOTOR RELAY (COIL SIDE) GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Check continuity between front blower motor relay connector
E22 terminal 2 and front air control harness connector M50 ter-
minal 38.

OK or NG

OK

>> Replace front air control. Refer to

ATC-127, "FRONT

AIR CONTROL"

.

NG

>> Repair harness or connector.

10.

REPLACE FUSES

1.

Replace fuses.

2.

Activate the front blower motor.

3.

Do fuses blow?

YES or NO

YES

>> GO TO 11.

NO

>> Inspection End.

11.

CHECK FRONT BLOWER MOTOR POWER SUPPLY CIRCUIT FOR SHORT

1.

Turn ignition switch OFF.

2.

Disconnect front blower motor connector and variable blower
control connector.

3.

Check continuity between variable blower control harness con-
nector M122 terminal 1 and ground.

OK or NG

OK

>> GO TO 12.

NG

>> Repair harness or connector.

1 - Ground

: Battery voltage

LJIA0080E

2 - 38

: Continuity should exist.

WJIA1115E

1 - Ground

: Continuity should not exist.

WJIA1264E