Nissan Pathfinder (2007 year). Instruction — part 53
TROUBLE DIAGNOSIS
ATC-75
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ATC
2007 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
Perform A/C system self-diagnosIs. Refer to
ATC-50, "A/C System Self-diagnosis Function"
Is self-diagnosis code 82 present?
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
ATC-76
TROUBLE DIAGNOSIS
2007 Pathfinder
Front Blower Motor Circuit
EJS004P8
SYMPTOM:
●
Blower motor operation is malfunctioning.
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - FRONT BLOWER
1.
Rotate the front blower control dial clockwise. Blower should operate.
2.
Rotate the front blower control dial clockwise, and continue checking blower speed and fan symbol until
all speeds are checked.
Can the symptom be duplicated?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
CHECK 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
>> System OK.
3.
CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4.
4.
PERFORM SELF-DIAGNOSIS
Perform self-diagnosis to check for any codes. Refer to
ATC-50, "A/C System Self-diagnosis Function"
.
Are any self-diagnosis codes present?
YES
>> Refer to
ATC-51, "SELF-DIAGNOSIS CODE CHART"
.
NO
>> GO TO 5.
5.
CHECK BLOWER MOTOR OPERATION
Check and verify blower motor operates instructionly in all speeds.
Does blower motor operate in all speeds?
YES
>> GO TO 6.
NO
>> Refer to
ATC-78, "DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR"
.
6.
CHECK ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT
Check engine coolant temperature sensor circuit. Refer to
EC-208, "DTC P0117, P0118 ECT SENSOR"
OK or NG?
OK
>> GO TO 7.
NG
>> Refer to
EC-211, "Diagnostic Procedure"
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
ATC-77
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ATC
2007 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
ATC-78
TROUBLE DIAGNOSIS
2007 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
TROUBLE DIAGNOSIS
ATC-79
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ATC
2007 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 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-82, "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
ATC-80
TROUBLE DIAGNOSIS
2007 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
TROUBLE DIAGNOSIS
ATC-81
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ATC
2007 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
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
ATC-82
TROUBLE DIAGNOSIS
2007 Pathfinder
12.
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
>> Check blower motor. If OK, replace variable blower con-
trol. Refer to
NG
>> Repair harness or connector.
COMPONENT INSPECTION
Front Blower Motor Relay
Check continuity between terminals by supplying 12 volts and
ground to coil side terminals of relay.
Front Blower Motor
Confirm smooth rotation of the blower motor.
●
Ensure that there are no foreign particles inside the blower unit.
●
Apply 12 volts to terminal 1 and ground to terminal 2 and verify
that the motor operates freely and quietly.
32 - 2
: Continuity should exist.
WJIA1263E
LJIA0068E
WJIA1265E
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