NISSAN NAVARA 2005 Repair Workshop Manual

TROUBLE DIAGNOSIS
ATC-77
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AT C
Intake Door Motor CircuitEJS006BM
SYMPTOM:
lIntake door does not change.
lIntake door motor does not operate normally.
INSPECTION FLOW
*1ATC-57, "Operational Check".*2ATC-55, "A/C System Self-diagno-
sis Function".*3ATC-56, "
SELF-DIAGNOSIS CODE
CHART".
MJIB0347E

ATC-78
TROUBLE DIAGNOSIS
SYSTEM DESCRIPTION
Component Parts
Intake door control system components are:
lFront air control
lIntake door motor
lIn-vehicle sensor
lAmbient sensor
lOptical sensor
lIntake 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
WJIA0551E
WJIA0436E

TROUBLE DIAGNOSIS
ATC-79
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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.
NOTE:
This illustration is for LHD models. The layout for RHD models is
symmetrically opposite.
DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR
1.CHECK RESULT FROM FRONT AIR CONTROL SELF-DIAGNOSIS
Self-diagnosis code 82 is present. Refer toAT C - 5 5 , "
A/C System Self-diagnosis Function".
YES or NO
YES >> GO TO 2.
NO >> Replace front air control. Refer toAT C - 11 6 , "
REMOVAL".
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
M60 terminal 5 and intake door motor harness connector M86
terminal 6 and between front air control harness connector M60
terminal 4 and intake door motor harness connector M86 termi-
nal 1.
OK or NG
OK >> Replace intake door motor. Refer toATC-129, "INTAKE
DOOR MOTOR".
NG >> Repair or replace harness as necessary.
MJIB0165E
5 - 6 Continuity should exist.
4 - 1 Continuity should exist.
MJIB0208E

ATC-80
TROUBLE DIAGNOSIS
Blower Motor Circuit
EJS006BN
SYMPTOM:
lBlower motor operation is malfunctioning.
lBlower motor operation is malfunctioning under cold starting conditions.
INSPECTION FLOW
*1AT C - 5 7 , "Operational Check".*2ATC-55, "A/C System Self-diagnosis
Function".*3AT C - 5 6 , "
SELF-DIAGNOSIS CODE
CHART".
*4AT C - 8 2 , "
DIAGNOSTIC PROCE-
DURE FOR BLOWER MOTOR".
MJIB0331E

TROUBLE DIAGNOSIS
ATC-81
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SYSTEM DESCRIPTION
Component Parts
Blower speed control system components are:
lFront air control
lIn-vehicle sensor
lAmbient sensor
lOptical sensor
lIntake 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

ATC-82
TROUBLE DIAGNOSIS
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.).
NOTE:
This illustration is for LHD models. The layout for RHD models is
symmetrically opposite.
DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR
SYMPTOM: Blower motor operation is malfunctioning under starting
blower speed control.
WJIA0441E
MJIB0166E
MJIB0064E

TROUBLE DIAGNOSIS
ATC-83
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1.CHECK FUSES
Check 15A fuses [No. 24 and 27, (located in the fuse and fusible link box)]. For fuse layout, refer toPG-84,
"FUSE AND FUSIBLE LINK BOX".
OK or NG
OK >> GO TO 2.
NG >> GO TO 10.
2.CHECK BLOWER MOTOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect blower motor connector.
3. Turn ignition switch ON.
4. Turn the blower control dial to select any mode except off.
5. Check voltage between blower motor harness connector M94
terminal 2 and ground.
OK or NG
OK >> GO TO 12.
NG >> GO TO 3.
3.CHECK BLOWER MOTOR RELAY (SWITCH SIDE) POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect blower motor relay.
3. Check voltage between blower motor relay harness connector
E28 terminals 3 and 6 and ground.
OK or NG
OK >> GO TO 4.
NG >> Repair harness or connector.
4.CHECK BLOWER MOTOR RELAY
Refer toAT C - 8 6 , "
Blower Motor Relay".
OK or NG
OK >> GO TO 5.
NG >> Replace blower motor relay.
5.CHECK BLOWER MOTOR RELAY (SWITCH SIDE) CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect blower motor relay connector and blower motor con-
nector.
3. Check continuity between blower motor relay harness connector
E28 terminals 5 and 7 and blower motor harness connector M94
terminal 2.
OK or NG
OK >> GO TO 6.
NG >> Repair harness or connector.Fuses are good.
2 - Ground : Battery voltage.
MJIB0065E
3, 6 - Ground : Battery voltage.
MJIB0066E
5, 7 - 2 : Continuity should exist.
MJIB0067E

ATC-84
TROUBLE DIAGNOSIS
6.CHECK VARIABLE BLOWER CONTROL POWER SUPPLY CIRCUIT FOR OPEN
1. Disconnect variable blower control harness connector.
2. Check continuity between blower motor relay harness connector
E28 terminals 5 and 7 and variable blower control harness con-
nector M96 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
M61 terminal 32 and variable blower control harness connector
M96 terminal 2.
OK or NG
OK >> GO TO 8.
NG >> Repair harness or connector.
8.CHECK BLOWER MOTOR RELAY (COIL SIDE) POWER SUPPLY
1. Turn ignition switch ON.
2. Check voltage between blower motor relay connector E28 termi-
nal 1 and ground.
OK or NG
OK >> GO TO 9.
NG >> Repair harness or connector.
9.CHECK BLOWER MOTOR RELAY (COIL SIDE) GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between blower motor relay connector E28 ter-
minal 2 and air control harness connector M61 terminal 38.
OK or NG
OK >> Replace front air control. Refer toAT C - 11 6 , "REMOVAL"
.
NG >> Repair harness or connector.5, 7 - 1 : Continuity should exist.
MJIB0068E
32 - 2 : Continuity should exist.
WJIA1263E
1 - Ground : Battery voltage.
LJIA0080E
2 - 38 : Continuity should exist.
WJIA1115E

TROUBLE DIAGNOSIS
ATC-85
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10.REPLACE FUSES
1. Replace fuses.
2. Activate the blower motor.
3. Do fuses blow?
YES or NO
YES >> GO TO 11.
NO >> Inspection End.
11 .CHECK BLOWER MOTOR POWER SUPPLY CIRCUIT FOR SHORT
1. Turn ignition switch OFF.
2. Disconnect blower motor connector and variable blower control
connector.
3. Check continuity between variable blower control harness con-
nector M96 terminal 1 and ground.
OK or NG
OK >> GO TO 12.
NG >> Repair harness or connector.
12.CHECK VARIABLE BLOWER CONTROL SIGNAL CIRCUIT
1. Disconnect front air control connector.
2. Check continuity between front air control harness connector
M61 terminal 32 and variable blower control harness connector
M96 terminal 2.
OK or NG
OK >> Check blower motor. If OK, replace variable blower con-
trol. Refer toATC-121, "
REMOVAL".
NG >> Repair harness or connector.1 - Ground : Continuity should not exist.
WJIA1264E
32 - 2 : Continuity should exist.
WJIA1263E

ATC-86
TROUBLE DIAGNOSIS
COMPONENT INSPECTION
Blower Motor Relay
Check continuity between terminals by supplying 12 volts and
ground to coil side terminals of relay.
Blower Motor
Confirm smooth rotation of the blower motor.
lEnsure that there are no foreign particles inside the blower unit.
lApply 12 volts to terminal + and ground to terminal - and verify
that the motor operates freely and quietly.
LJIA0068E
WJIA1265E