sensor NISSAN NAVARA 2005 Repair Workshop Manual

TROUBLE DIAGNOSIS
MTC-79
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MTC
Magnet Clutch CircuitEJS005GL
SYMPTOM: Magnet clutch does not engage.
INSPECTION FLOW
*1MTC-53, "Operational Check"*2MTC-51, "A/C System Self-diagnosis
Function".*3MTC-52, "
SELF-DIAGNOSIS CODE
CHART".
*5MTC-95, "
Intake Sensor Circuit".
MJIB0242E

MTC-80
TROUBLE DIAGNOSIS
SYSTEM DESCRIPTION
The front air control controls compressor operation based on intake temperature and a signal from ECM.
Low Temperature Protection Control
The front air control will turn the compressor ON or OFF as determined by a signal detected by the intake sen-
sor.
When intake air temperature is higher than the preset value, the compressor turns ON. The compressor turns
OFF when intake air temperature is lower than the preset value. That preset value is dependent on the ambi-
ent temperature, refer to the following table.
DIAGNOSTIC PROCEDURE FOR MAGNET CLUTCH
SYMPTOM: Magnet clutch does not engage when A/C switch is ON.
1.CHECK INTAKE SENSOR CIRCUIT
Check intake sensor. Refer toMTC-95, "
Intake Sensor Circuit".
OK or NG
OK >> GO TO 2.
NG >> Malfunctioning tintake sensor. Refer toMTC-99, "
INTAKE SENSOR".
Ambient temperature°C(°F)Compressor ON
intake temperature C (°F)Compressor OFF
intake temperature C (°F)
0 (32) 5.5 (42) 5.0 (41)
10 (50) 4.5 (40) 4.5 (40)
20 (68) 2.5 (37) 2.0 (36)
30 (86) 2.0 (36) 1.5 (35)
40 (104) 2.0 (36) 1.5 (35)
50 (122) 2.0 (36) 1.5 (35)
MJIB0322E

TROUBLE DIAGNOSIS
MTC-83
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MTC
8.CHECK REFRIGERANT PRESSURE SENSOR
WITH CONSULT-II
1. Start engine.
2. Check voltage of refrigerant pressure sensor. Refer toBCS-14, "
CONSULT-II Function (BCM)".
WITHOUT CONSULT-II
1. Start engine.
2. Check voltage between ECM harness connector F1 terminal 53
and ground.
OK or NG
OK >>lWITH CONSULT-II
GO TO 9.
lWITHOUT CONSULT-II
GO TO 10.
NG >> Refer toEC-325, "
REFRIGERANT PRESSURE SENSOR".
9.CHECK BCM INPUT (FAN ON) SIGNAL
Check FAN ON/OFF signal. Refer toBCS-14, "
CONSULT-II Func-
tion (BCM)".
OK or NG
OK >> GO TO 12.
NG >> GO TO 10.
Terminals
Condition Voltage (+)
(-)
ECM
connectorTerminal No.
F1 53 Ground A/C switch: ON Approx. 0.36 - 3.88V
MJIB0071E
BLOWER CONTROL
SWITCH ON: FAN ON SIG ON
BLOWER CONTROL
SWITCH OFF:FANONSIGOFF
WJIA0469E

TROUBLE DIAGNOSIS
MTC-85
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MTC
12.CHECK SELF-DIAGNOSTIC RESULT
Perform self-diagnosis. Refer toAT C - 5 5 , "
A/C System Self-diagnosis Function"
OK or NG
OK >> Inspection End.
NG >> Refer toAT C - 5 6 , "
SELF-DIAGNOSIS CODE CHART".
COMPONENT INSPECTION
Refrigerant Pressure Sensor
The refrigerant pressure sensor is attached to the condenser.
MJIB0197E

TROUBLE DIAGNOSIS
MTC-91
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MTC
High-pressure Side is Too Low and Low-pressure Side is Too High
Both High- and Low-pressure Sides are Too Low
Gauge indication Refrigerant cycle Probable cause Corrective action
High-pressure side is too low and
low-pressure side is too high.High- and low-pressure sides
become equal soon after com-
pressor operation stops.Compressor pressure opera-
tion is improper.
¯
Damaged inside compressor
packings.Replace compressor.
No temperature difference
between high- and low-pres-
sure sides.Compressor pressure opera-
tion is improper.
¯
Damaged inside compressor
packings.Replace compressor.
AC356A
Gauge indication Refrigerant cycle Probable cause Corrective action
Both high- and low-pressure sides
are too low.
lThere is a big temperature
difference between receiver
drier outlet and inlet. Outlet
temperature is extremely
low.
lLiquid tank inlet and expan-
sion valve are frosted.Liquid tank inside is slightly
clogged.
lReplace liquid tank.
lCheck lubricant for contami-
nation.
lTemperature of expansion
valve inlet is extremely low
as compared with areas
near liquid tank.
lExpansion valve inlet may
be frosted.
lTemperature difference
occurs somewhere in high-
pressure side.High-pressure pipe located
between receiver drier and
expansion valve is clogged.
lCheck and repair malfunc-
tioning parts.
lCheck lubricant for contami-
nation.
Expansion valve and liquid
tank are warm or only cool
when touched.Low refrigerant charge.
¯
Leaking fittings or compo-
nents.Check refrigerant system for
leaks. Refer toMTC-131,
"Checking for Refrigerant
Leaks"
There is a big temperature dif-
ference between expansion
valve inlet and outlet while the
valve itself is frosted.Expansion valve closes a little
compared with the specifica-
tion.
¯
1. Improper expansion valve
adjustment.
2. Malfunctioning expansion
valve.
3. Outlet and inlet may be
clogged.lRemove foreign particles by
using compressed air.
lCheck lubricant for contami-
nation.
An area of the low-pressure
pipe is colder than areas near
the evaporator outlet.Low-pressure pipe is clogged
or crushed.
lCheck and repair malfunc-
tioning parts.
lCheck lubricant for contami-
nation.
Air flow volume is too low. Evaporator is frozen.
lCheck intake sensor circuit.
Refer toMTC-95, "
Intake
Sensor Circuit".
lReplace compressor.
AC353A

TROUBLE DIAGNOSIS
MTC-93
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MTC
Insufficient HeatingEJS005GN
SYMPTOM: Insufficient heating
INSPECTION FLOW
*1 .MTC-53, "Operational Check".*2MTC-63, "Air Mix Door Motor Cir-
cuit".*3MTC-51, "
A/C System Self-diagno-
sis Function".
*4MTC-51, "
A/C System Self-diagno-
sis Function".*5MTC-71, "
Blower Motor Circuit".*6EC-103, "DTC P0117, P0118 ECT
SENSOR".
*7CO-7, "
Changing Engine Coolant".*8CO-13, "Checking Reservoir Tank
Cap".
MJIB0354E

TROUBLE DIAGNOSIS
MTC-95
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MTC
Self-diagnosisEJS005GP
SYMPTOM: Self-diagnosis cannot be performed (Vehicles equipped with NAVI only).
INSPECTION FLOW
Intake Sensor CircuitEJS005GR
COMPONENT DESCRIPTION
Intake Sensor
The intake sensor is located on the heater & cooling unit. It converts
temperature of air after it passes through the evaporator into a resis-
tance value which is then input to the front air control.
NOTE:
This illustration is for LHD models.
The layout for RHD models is symmetrically opposite.
*1MTC-122, "REMOVAL".*2MTC-122, "INSTALLATION".*3MTC-24, "Maintenance of Lubricant
Quantity in Compressor".
*4MTC-53, "
Operational Check".*5EM-12, "DRIVE BELTS".
*1MTC-55, "
Power Supply and Ground
Circuit for Front Air Control".2.MTC-63, "
Air Mix Door Motor Cir-
cuit".3.MTC-53, "
Operational Check".
MJIB0246E
MJIB0198E

MTC-96
TROUBLE DIAGNOSIS
DIAGNOSTIC PROCEDURE FOR INTAKE SENSOR
SYMPTOM: Intake sensor circuit is open or shorted. (56 or 57 is indi-
cated on front air control as a result of conducting Self-diagnosis).
1.CHECK VOLTAGE BETWEEN INTAKE SENSOR AND GROUND
1. Disconnect intake sensor connector.
2. Turn ignition switch ON.
3. Check voltage between intake sensor harness connector M82
terminal 2 and ground.
OK or NG
OK >> GO TO 2.
NG >> GO TO 4.
2.CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND FRONT AIR CONTROL
1. Turn ignition switch OFF.
2. Disconnect front air control connector.
3. Check continuity between intake sensor harness connector M82
terminal 1 and front air control harness connector M98 terminal
13.
OK or NG
OK >> GO TO 3.
NG >> Repair harness or connector.
3.CHECK INTAKE SENSOR
Refer toMTC-97, "
COMPONENT INSPECTION".
OK or NG
OK >> 1. Replace front air control.
2. Go to self-diagnosisMTC-51, "
A/C System Self-diagnosis Function"and perform self-diagno-
sis.
NG >> 1. Replace intake sensor.
2. Go to self-diagnosisMTC-51, "
A/C System Self-diagnosis Function"and perform self-diagno-
sis.
WJIA1156E
2 - Ground : Approx. 5V
WJIA1278E
1 - 13 : Continuity should exist.
WJIA1157E

TROUBLE DIAGNOSIS
MTC-97
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MTC
4.CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND FRONT AIR CONTROL
1. Turn ignition switch OFF.
2. Disconnect front air control connector.
3. Check continuity between intake sensor harness connector M82
terminal 2 and front air control harness connector M98 terminal
12.
4. Check continuity between intake sensor harness connector M82
terminal 2 and ground.
OK or NG
OK >> 1. Replace front air control.
2. Go to self-diagnosisMTC-51, "
A/C System Self-diagnosis Function"and perform self-diagno-
sis.
NG >> Repair harness or connector.
COMPONENT INSPECTION
Intake Sensor
After disconnecting intake sensor connector, measure resistance
between terminals 1 and 2 at sensor harness side, using the table
below.
If NG, replace intake sensor.
NOTE:
This illustration is for LHD models.
The layout for RHD models is symmetrically opposite.2 - 12 : Continuity should exist.
2 - Ground : Continuity should not exist.
WJIA1158E
Temperature°C(°F) Resistance kW
-15 (5) 209.0
-10 (14) 160.0
-5 (23) 123.0
0 (32) 95.8
5 (41) 74.9
10 (50) 58.9
15 (59) 46.7
20 (68) 37.3
25 (77) 30.0
30 (86) 24.2
35 (95) 19.7
40 (104) 16.1
45 (113) 13.2
MJIB0199E

INTAKE SENSOR
MTC-99
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MTC
INTAKE SENSORPFP:27723
Removal and InstallationEJS005GT
REMOVAL
1. Remove the instrument panel. Refer toIP-10, "Removal and Installation".
2. Disconnect the intake sensor electrical connector.
NOTE:
The intake sensor is located on the top of the heater and cooling
unit assembly next to the A/C evaporator cover.
3. Twist the intake sensor to remove the intake sensor from the
heater and cooling unit assembly.
INSTALLATION
Installation is in the reverse order of removal.
MJIB0325E