Nissan Pathfinder (2006 year). Instruction — part 338
TROUBLE DIAGNOSIS
MTC-57
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MTC
2006 Pathfinder
Front Blower Motor Circuit
EJS004RQ
SYMPTOM:
●
Blower motor operation is malfunctioning.
INSPECTION FLOW
*1
*2
MTC-59, "DIAGNOSTIC PROCE-
DURE FOR BLOWER MOTOR"
*3
EC-207, "DTC P0117, P0118 ECT
SENSOR"
*4
*5
WJIA1501E
MTC-58
TROUBLE DIAGNOSIS
2006 Pathfinder
SYSTEM DESCRIPTION
Component Parts
Blower speed control system components are:
●
Front air control
●
Front blower motor resistor
●
Front blower motor
●
Front blower relay
System Operation
COMPONENT DESCRIPTION
Blower Motor Resistor
The front blower motor resistor is located on the heater and cooling
unit assembly. The front blower motor resistor grounds the front
blower motor through a series of 1, 2, or 3 resistors, depending upon
speed selected. For high speed operation the front blower motor
resistor is circumvented and the front blower motor grounds directly.
WJIA1502E
WJIA1487E
TROUBLE DIAGNOSIS
MTC-59
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MTC
2006 Pathfinder
DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR
SYMPTOM: Blower motor operation is malfunctioning under starting
blower speed control.
1.
DIAGNOSTIC PROCEDURE
1.
Turn ignition switch ON.
2.
Turn the front blower switch to each of its four speeds.
Does blower motor rotate normally at each speed?
YES or NO
YES
>> Inspection End.
NO
>> 1. Does not rotate at any speed, GO TO 2.
2. Does not rotate at 1 - 3 speed, GO TO 13.
3. Does not rotate at 4 speed, GO TO 16.
2.
CHECK FUSES
1.
Check 15A fuses (Nos. 24 and 27, located in the fuse and fusible link box). Refer to
2.
Check 10A fuse [No. 8, located in the fuse block (JB)]. Refer to
PG-83, "FUSE BLOCK-JUNCTION BOX
OK or NG
OK
>> GO TO 3.
NG
>> GO TO 8.
WJIA1503E
MTC-60
TROUBLE DIAGNOSIS
2006 Pathfinder
3.
CHECK FRONT BLOWER MOTOR POWER SUPPLY
1.
Turn ignition switch OFF.
2.
Disconnect front blower motor harness connector.
3.
Turn ignition switch ON.
4.
Select any front blower speed except OFF.
5.
Check voltage between front blower motor harness connector
M62 terminal 2 and ground.
OK or NG
OK
>> GO TO 12.
NG
>> GO TO 4.
4.
CHECK FRONT BLOWER MOTOR RELAY
1.
Turn Ignition switch OFF.
2.
Check front blower motor relay. Refer to
MTC-63, "Front Blower Motor Relay"
.
OK or NG
OK
>> GO TO 5.
NG
>> Replace front blower motor relay.
5.
CHECK FRONT BLOWER MOTOR RELAY POWER SUPPLY (SWITCH SIDE)
Check voltage between front blower motor relay harness connector
E54 terminals 7 and 5 and ground.
OK or NG
OK
>> GO TO 6.
NG
>> Repair harness or connector.
2 - Ground
: Battery voltage
WJIA1331E
A
Condition
Voltage
(Approx.)
(+)
Front air control
connector
Terminal
(-)
M54
5 Ground
Blower motor
relay power
supply
Battery voltage
M54
7 Ground
Blower motor
relay power
supply
Battery voltage
WJIA1634E
TROUBLE DIAGNOSIS
MTC-61
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MTC
2006 Pathfinder
6.
CHECK FRONT BLOWER MOTOR RELAY POWER SUPPLY (COIL SIDE)
1.
Turn ignition switch ON.
2.
Check voltage between front blower motor relay harness con-
nector E54 terminal 1 and ground.
OK or NG
OK
>> GO TO 7.
NG
>> Repair or replace harness as necessary.
7.
CHECK FRONT BLOWER MOTOR POWER FROM RELAY TO FRONT BLOWER MOTOR
1.
Turn ignition switch OFF.
2.
Check continuity between front blower motor relay harness con-
nector E54 terminals 6 and 3 and front blower motor harness
connector M62 terminal 2.
OK or NG
OK
>> Repair or replace harness as necessary.
NG
>> Repair harness or connector between the front blower
motor relay and the front blower motor.
8.
REPLACE FUSE
Refer to
PG-84, "FUSE AND FUSIBLE LINK BOX"
Does fuse No. 24 or 27 open when the front blower motor is turned on?
YES or NO
YES
>> GO TO 10.
NO
>> GO TO 9.
9.
REPLACE FUSE
Refer to
PG-83, "FUSE BLOCK-JUNCTION BOX (J/B)"
Does fuse No. 8 open when the ignition switch is turned ON?
YES or NO
YES
>> Repair or replace harness as necessary.
NO
>> Inspection End.
A
Condition
Voltage
(Approx.)
(+)
Front air control
connector
Terminal
(-)
M54
1 Ground
Blower motor
relay power
supply (coil
side)
Battery voltage
WJIA0504E
3, 6 - 2
: Continuity should exist.
WJIA1333E
MTC-62
TROUBLE DIAGNOSIS
2006 Pathfinder
10.
CHECK FRONT BLOWER MOTOR POWER SUPPLY CIRCUIT FOR SHORT
1.
Turn ignition switch OFF.
2.
Disconnect front blower motor connector.
3.
Check continuity between front blower motor harness connector
M62 terminal 2 and ground.
OK or NG
OK
>> GO TO 11.
NG
>> Repair or replace harness as necessary.
11.
CHECK FRONT BLOWER MOTOR RELAY (SWITCH SIDE) POWER SUPPLY CIRCUIT FOR SHORT
1.
Disconnect front blower motor relay connector.
2.
Check continuity between the front blower motor relay harness
connector E54 terminal 7 and terminal 5 and ground.
OK or NG
OK
>> Check front blower motor. Refer to
.
NG
>> Repair harness or connector.
12.
CHECK FRONT BLOWER MOTOR
1.
Turn ignition switch OFF.
2.
Check front blower motor. Refer to
.
OK or NG
OK
>> GO TO 13.
NG
>> Replace front blower motor. Refer to
13.
CHECK FRONT BLOWER MOTOR RESISTOR
Check front blower motor resistor. Refer to
MTC-58, "Blower Motor Resistor"
OK or NG
OK
>> GO TO 14.
NG
>> Replace front blower motor resistor. Refer to
MTC-93, "Removal and Installation"
14.
CHECK FRONT BLOWER SWITCH
Check front blower switch. Refer to
.
OK or NG
OK
>> GO TO 15.
NG
>> Replace front blower switch. Refer to
.
2 - Ground
: Continuity should not exist.
WJIA0649E
7, 5 - Ground
: Continuity should not exist.
WJIA1334E
TROUBLE DIAGNOSIS
MTC-63
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MTC
2006 Pathfinder
15.
CHECK FRONT BLOWER MOTOR GROUND CIRCUIT TO FRONT BLOWER MOTOR RESISTOR
1.
Disconnect front blower motor resistor harness connector.
2.
Check continuity between front blower motor connector M62 (A)
terminal 1 and front blower motor resistor harness connector
M122 (B) terminal 3.
OK or NG
OK
>> Repair harness or connector between front blower switch connector M51 terminal 8 and ground.
NG
>> Repair harness or connector between front blower motor resistor and front blower motor.
16.
CHECK FRONT BLOWER SWITCH
Check front blower switch. Refer to
OK or NG
OK
>> Repair harness or connector between front blower motor switch connector M51 terminal 8 and
front blower motor resistor connector M122 terminal 3.
NG
>> Replace front blower switch. Refer to
COMPONENT INSPECTION
Front Blower Motor Relay
Check continuity between terminals by supplying 12 volts and
ground to coil side terminals of relay.
A
B
Connector
Terminal Connector
Terminal
Continuity
Front blower motor:
M62
1
Front blower
motor resistor:
M122
3
Yes
WJIA1676E
LJIA0068E
MTC-64
TROUBLE DIAGNOSIS
2006 Pathfinder
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 2 and ground to terminal 1 and verify
that the motor operates freely and quietly.
Front Blower Switch
Check continuity between terminals at each switch position.
WJIA1508E
WJIA0508E
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