NISSAN NAVARA 2005 Repair Workshop Manual

TROUBLE DIAGNOSIS
ATC-87
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AT C
Magnet Clutch CircuitEJS006BQ
SYMPTOM: Magnet clutch does not engage.
INSPECTION FLOW
*1AT C - 5 7 , "Operational Check".*2ATC-55, "A/C System Self-diagnosis
Function".*3AT C - 5 6 , "
SELF-DIAGNOSIS CODE
CHART".
*4ATC-105, "
Ambient Sensor Circuit".*5ATC-114, "Intake Sensor Circuit".
MJIB0348E

ATC-88
TROUBLE DIAGNOSIS
SYSTEM DESCRIPTION
The front air control controls compressor operation based on ambient and 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 and the ambient sensor.
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 AND AMBIENT SENSOR CIRCUITS
Check intake and ambient sensors. Refer toAT C - 5 5 , "
A/C System Self-diagnosis Function".
OK or NG
OK >> GO TO 2.
NG >>
lMalfunctioning intake sensor. Refer toAT C - 11 4 , "Intake Sensor Circuit".
lMalfunctioning ambient sensor. Refer toATC-105, "Ambient Sensor Circuit".
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)
MJIB0328E

TROUBLE DIAGNOSIS
ATC-89
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AT C
2.PERFORM AUTO ACTIVE TEST
Refer toPG-19, "
Auto Active Test".
Does magnet clutch operate?
YES or NO
YES >>lWITH CONSULT-II
GO TO 5.
lWITHOUT CONSULT-II
GO TO 6.
NO >> Check 10A fuse (No. 42, located in IPDM E/R), and GO TO 3.
3.CHECK CIRCUIT CONTINUITY BETWEEN IPDM E/R AND COMPRESSOR
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R connector and compressor (magnet
clutch) connector.
3. Check continuity between IPDM E/R harness connector E12 ter-
minal 11 and compressor harness connector F20 terminal 1.
OK or NG
OK >> GO TO 4.
NG >> Repair harness or connector.
4.CHECK MAGNET CLUTCH CIRCUIT
Check for operation sound when applying battery voltage direct cur-
rent to terminal.
OK or NG
OK >> Replace IPDM E/R. Refer toPG-26, "Removal and
Installation of IPDM E/R".
NG >> Replace magnet clutch. Refer toBCS-17, "
Removal and
Installation of BCM".
5.CHECK BCM INPUT (COMPRESSOR ON) SIGNAL
Check compressor ON/OFF signal. Refer toAT C - 3 3 , "
CONSULT-II
Function (BCM)".
OK or NG
OK >> GO TO 8.
NG >> GO TO 6.
11 – 1 : Continuity should exist.
WJIA0560E
SJIA0197E
A/C SW ON : COMP ON SIG ON
A/CSWOFF :COMPONSIGOFF
WJIA0469E

ATC-90
TROUBLE DIAGNOSIS
6.CHECK CIRCUIT CONTINUITY BETWEEN BCM AND FRONT AIR CONTROL
1. Turn ignition switch OFF.
2. Disconnect BCM connector and front air control connector.
3. Check continuity between BCM harness connector M42 terminal
27 and front air control harness connector M60 terminal 10.
OK or NG
OK >> GO TO 7.
NG >> Repair harness or connector.
7.CHECK VOLTAGE FOR FRONT AIR CONTROL (COMPRESSOR ON SIGNAL)
1. Reconnect BCM connector and front air control connector.
2. Turn ignition switch ON.
3. Check voltage between front air control harness connector M60
terminal 10 and ground.
OK or NG
OK >> GO TO 8.
NG-1 >> If the voltage is approx. 5V when A/C switch is ON, replace front air control. Refer toAT C - 11 6 ,
"REMOVAL".
NG-2 >> If the voltage is approx. 0V when A/C switch is OFF, replace BCM. Refer toBCS-17, "
Removal
and Installation of BCM". 27 - 10 Continuity should exist.
MJIB0070E
Terminals
ConditionVoltage
(Approx.) (+)
(-) Front air
control con-
nectorTerminal No.
M60 10 GroundA/C switch: ON 0V
A/C switch: OFF 5V
WJIA1137E

TROUBLE DIAGNOSIS
ATC-91
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AT C
8.CHECK REFRIGERANT PRESSURE SENSOR
WITH CONSULT-II
1. Start engine.
2. Check voltage of refrigerant pressure sensor. Refer toAT C - 3 3 , "
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 toAT C - 3 3 , "
CONSULT-II Function
(BCM)".
OK or NG
OK >> GO TO 12.
NG >> GO TO 10.
10.CHECK CIRCUIT CONTINUITY BETWEEN BCM AND FRONT AIR CONTROL
1. Turn ignition switch OFF.
2. Disconnect BCM connector and front air control connector.
3. Check continuity between BCM harness connector M42 terminal
26 and front air control harness connector M61 terminal 35.
OK or NG
OK >> GO TO 11.
NG >> Repair harness or connector.
Te r m i n a l s
ConditionVo l ta g e
(Approx.) (+)
(-)
ECM con-
nectorTerminal No.
F1 53 Ground A/C switch: ON 0.36 - 3.88V
MJIB0071E
FRONT BLOWER CONTROL
DIAL ON: FAN ON SIG ON
FRONT BLOWER CONTROL
DIAL OFF:FANONSIGOFF
WJIA0469E
26 - 35 Continuity should exist.
MJIB0072E

ATC-92
TROUBLE DIAGNOSIS
11 .CHECK VOLTAGE FOR FRONT AIR CONTROL (FAN ON SIGNAL)
1. Reconnect BCM connector and front air control connector.
2. Turn ignition switch ON.
3. Check voltage between front air control harness connector M61
terminal 35 and ground.
OK or NG
OK >> GO TO 12.
NG-1 >> If the voltage is approx. 5V when blower motor is ON, replace front air control. Refer toAT C - 11 6 ,
"REMOVAL".
NG-2 >> If the voltage is approx. 0V when blower motor is OFF, replace BCM. Refer toBCS-17, "
Removal
and Installation of BCM".
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.
Terminals
ConditionVoltage
(Approx.) (+)
(-)
Front air con-
trol connectorTerminal No.
M61 35 GroundA/C switch: ON
Blower motor
operates0V
A/C switch: OFF 5V
WJIA1139E
MJIB0167E

TROUBLE DIAGNOSIS
ATC-93
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AT C
Insufficient CoolingEJS006BR
SYMPTOM: Insufficient cooling
INSPECTION FLOW
*1ATC-57, "Operational Check".*2ATC-55, "A/C System Self-diagno-
sis Function".*3AT C - 5 6 , "
SELF-DIAGNOSIS CODE
CHART".
*4EC-18, "
SYSTEM DESCRIPTION".*5AT C - 4 , "Contaminated Refrigerant".*6AT C - 9 4 , "PERFORMANCE TEST
DIAGNOSES".
*7ATC-96, "
Test Reading".*8EM-12, "Checking Drive Belts".
MJIB0349E

ATC-94
TROUBLE DIAGNOSIS
PERFORMANCE TEST DIAGNOSES
*1ATC-96, "PERFORMANCE
CHART".*2ATC-96, "
PERFORMANCE
CHART".*3AT C - 9 7 , "
Trouble Diagnoses for
Unusual Pressure".
*4ATC-68, "
Air Mix Door Motor Circuit".
RJIA1601E

TROUBLE DIAGNOSIS
ATC-95
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AT C
*1ATC-143, "Removal and Installation
for Compressor Clutch".*2ATC-80, "
Blower Motor Circuit".*3EM-12, "Checking Drive Belts".
RJIA3107E

ATC-96
TROUBLE DIAGNOSIS
PERFORMANCE CHART
Test Condition
Testing must be performed as follows:
Test Reading
Recirculating-to-discharge Air Temperature Table
Ambient Air Temperature-to-operating Pressure Table
Vehicle location Indoors or in the shade (in a well-ventilated place)
Doors Closed
Door window Open
Hood Open
TEMP. Max. COLD
Mode switch
(Ventilation) set
Recirculation (REC) switch
(Recirculation) set
Blower speedMax. speed set
Engine speed Idle speed
Operate the air conditioning system for 10 minutes before taking measurements.
Inside air (Recirculating air) at blower assembly inlet
Discharge air temperature at center ventilator
°C(°F) Relative humidity
%Air temperature
°C(°F)
40 - 6020 (68) 9.6 - 12.0 (49 - 54)
25 (77) 13.6 - 16.5 (56 - 62)
30 (86) 18.0 - 21.4 (64 - 71)
35 (95) 22.8 - 26.7 (73 - 80)
60 - 8020 (68) 12.0 - 14.3 (54 - 58)
25 (77) 16.5 - 19.3 (62 - 67)
30 (86) 21.4 - 24.8 (71 - 77)
35 (95) 26.7 - 30.5 (80 - 87)
Ambient air
High-pressure (Discharge side)
kPa (kg/cm
2, psi)Low-pressure (Suction side)
kPa (kg/cm2, psi) Relative humidity
%Air temperature
°C(°F)
40 - 6020 (68)1,090 - 1,210
(11.11 - 12.33, 158.0 - 175.4)220 - 240
(2.24 - 2.45, 31.9 - 34.8)
25 (77)1,370 - 1,520
(13.97 - 15.49, 198.6 - 220.3)280 - 310
(2.85 - 3.16, 40.6 - 44.9)
30 (86)1,610 - 1,790
(16.41 - 18.25, 233.4 - 259.5)330 - 370
(3.36 - 3.77, 47.8 - 53.6)
35 (95)1,940 - 2,150
(19.78 - 21.92, 281.2 - 311.7)390 - 430
(3.98 - 4.38, 56.5 - 62.3)
60 - 8020 (68)1,210 - 1,330
(12.33 - 13.56, 175.4 - 192.8)240 - 260
(2.45 - 2.65, 34.8 - 37.7)
25 (77)1,520 - 1,670
(15.49 - 17.02, 220.3 - 242.1)310 - 340
(3.16 - 3.47, 44.9 - 49.3)
30 (86)1,790 - 1,970
(18.25 - 20.08, 259.5 - 285.6)370 - 410
(3.77 - 4.18, 53.6 - 59.4)
35 (95)2,150 - 2,370
(21.92 - 24.16, 311.7 - 343.5)430 - 470
(4.38 - 4.79, 62.3 - 68.1)