Nissan Pathfinder (2005 year). Instruction — part 358
TROUBLE DIAGNOSIS
MTC-55
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MTC
2005 Pathfinder
DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR
1.
CHECK INTAKE DOOR MOTOR CIRCUIT VOLTAGE
1.
Turn ignition switch OFF.
2.
Disconnect intake door motor connector.
3.
Turn ignition switch ON.
4.
Rotate the temperature control dial counterclockwise.
5.
Check voltage between intake door motor harness connector
M58 terminal 6 and ground.
OK or NG
OK
>> GO TO 3.
NG
>> GO TO 2.
2.
CHECK INTAKE DOOR MOTOR CIRCUIT FOR OPEN
1.
Turn ignition switch OFF.
2.
Disconnect front air control connector.
3.
Check continuity between front air control harness connector
M49 terminal 5 and intake door motor harness connector M58
terminal 6.
OK or NG
OK
>> Replace front air control connector. Refer to
.
NG
>> Repair or replace harness as necessary.
3.
CHECK INTAKE DOOR MOTOR CIRCUIT VOLTAGE
1.
Rotate the temperature control dial clockwise.
2.
Check voltage between intake door motor harness connector
M58 terminal 1 and ground.
OK or NG
OK
>> Replace intake door motor. Refer to
.
NG
>> GO TO 4.
4.
CHECK INTAKE DOOR MOTOR CIRCUIT FOR OPEN
1.
Turn ignition switch OFF.
2.
Disconnect front air control connector.
3.
Check continuity between front air control harness connector
M49 terminal 4 and intake door motor harness connector M58
terminal 1.
OK or NG
OK
>> Replace front air control connector. Refer to
.
NG
>> Repair or replace harness as necessary.
6 - Ground
Battery voltage.
WJIA1324E
5 - 6
Continuity should exist.
WJIA1468E
1 - Ground
Battery voltage.
WJIA1326E
4 - 1
Continuity should exist.
WJIA1469E
MTC-56
TROUBLE DIAGNOSIS
2005 Pathfinder
Front Blower Motor Circuit
EJS003VJ
SYMPTOM:
●
Blower motor operation is malfunctioning.
●
Blower motor operation is malfunctioning under cold starting conditions.
INSPECTION FLOW
*1
*2
MTC-58, "DIAGNOSTIC PROCE-
DURE FOR BLOWER MOTOR"
*3
EC-204, "DTC P0117, P0118 ECT
SENSOR"
*4
WJIA1328E
TROUBLE DIAGNOSIS
MTC-57
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MTC
2005 Pathfinder
SYSTEM DESCRIPTION
Component Parts
Blower speed control system components are:
●
Front air control
●
Intake sensor
System Operation
COMPONENT DESCRIPTION
Blower Motor Resistor
The blower motor resistor is located on the cooling unit. The blower
motor resistor grounds the blower motor through a series of 1, 2, or 3
resistors, depending upon speed selected. For high speed operation
the blower motor resistor is circumvented and the blower motor
grounds directly.
WJIA1329E
WJIA0648E
MTC-58
TROUBLE DIAGNOSIS
2005 Pathfinder
DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR
SYMPTOM: Blower motor operation is malfunctioning under starting
blower speed control.
1.
DIAGNOSTIC PROCEDURE
Turn the front blower switch to each of its four speeds.
Does blower motor rotate normally at each speed?
OK or NG
OK
>> Inspection End.
NG
>> 1. Does not rotate at any speed, GO TO 2.
2. Does not rotate at 1 - 3 speed, GO TO 12.
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
.
OK or NG
OK
>> GO TO 3.
NG
>> GO TO 8.
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.
WJIA1330E
2 - Ground
: Battery voltage
WJIA1331E
TROUBLE DIAGNOSIS
MTC-59
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MTC
2005 Pathfinder
4.
CHECK FRONT BLOWER MOTOR RELAY
1.
Turn Ignition switch OFF.
2.
Refer to
MTC-61, "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)
1.
Turn Ignition switch ON.
2.
Check voltage between front blower motor relay harness con-
nector E54 terminals 7 and 5 and ground.
OK or NG
OK
>> GO TO 6.
NG
>> Repair harness or connector.
6.
CHECK FRONT BLOWER MOTOR RELAY POWER SUPPLY (COIL SIDE)
1.
Check voltage between front blower motor relay harness con-
nector E54 terminal 1 and ground.
OK or NG
OK
>> GO TO 7.
NG
>> Repair harness or connector between the front blower
motor relay and the fuse block (JB).
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 harness or connector between the front blower
motor relay terminal 2 to ground.
NG
>> Repair harness or connector between the front blower
motor relay and the front blower motor.
8.
REPLACE FUSE
Refer to
PG-80, "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 9.
NO
>> GO TO 10.
7, 5 - ground
: Battery voltage.
WJIA1332E
1 - Ground
: Battery voltage.
WJIA0504E
3, 6 - 2
: Continuity should exist.
WJIA1333E
MTC-60
TROUBLE DIAGNOSIS
2005 Pathfinder
9.
REPLACE FUSE
Refer to
PG-79, "FUSE BLOCK-JUNCTION BOX(J/B)"
.
Does fuse No. 8 open when the ignition switch is turned ON?
YES or NO
YES
>> Repair harness or connector between front blower motor relay and fuse No. 8.
NO
>> Inspection End.
10.
CHECK FRONT BLOWER MOTOR POWER SUPPLY CIRCUIT FOR SHORT
Check continuity between front blower motor harness connector
M62 terminal 2 and ground.
OK or NG
OK
>> GO TO 11.
NG
>> Repair harness or connector between front blower
motor and front blower motor relay.
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.
Refer to
.
OK or NG
OK
>> GO TO 13.
NG
>> Replace front blower motor. Refer to
.
13.
CHECK FRONT BLOWER MOTOR RESISTOR
Refer to
MTC-57, "Blower Motor Resistor"
.
OK or NG
OK
>> GO TO 14.
NG
>> Replace front blower motor resistor. Refer to
MTC-92, "Removal and Installation"
.
14.
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
1 - Ground
: Continuity should not exist.
WJIA1334E
TROUBLE DIAGNOSIS
MTC-61
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MTC
2005 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 ter-
minal 1 and front blower motor resistor harness connector M122
terminal 3.
OK or NG
OK
>> Repair harness or connector between front blower
switch connector M51 terminal 4 and ground.
NG
>> Repair harness or connector between front blower
motor resistor and front blower motor.
16.
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.
1 - 3
: Continuity should exist.
WJIA1335E
LJIA0068E
MTC-62
TROUBLE DIAGNOSIS
2005 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.
WJIA1265E
WJIA0508E
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