Nissan Murano Z50 (2006 year). Manual — part 7
TROUBLE DIAGNOSIS
ATC-73
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SYSTEM DESCRIPTION
Component Parts
Fan speed control system components are:
●
Unified meter and A/C amp.
●
A/C LAN system (PBR built-in mode door motor, intake door motor and air mix door motor)
●
In-vehicle sensor
●
Ambient sensor
●
Sunload sensor
●
Intake sensor
System Operation
Automatic Mode
In the automatic mode, the blower motor speed is calculated by the unified meter and A/C amp. based on the
input from the PBR, in-vehicle sensor, sunload sensor, intake sensor and ambient sensor.
When the air flow is increased, the duty ratio of the blower fan motor’s drive signal is changed at 8%/sec. 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 Fan Speed Control
Start up from COLD SOAK Condition (Automatic mode)
In a cold start up condition where the engine coolant temperature is below 56
°
C (133
°
F), the blower will not
operate for a short period of time (up to 150 seconds). The exact start delay time varies depending on the
ambient and engine coolant temperature.
In the most extreme case (very low ambient) the blower starting delay will be 150 seconds as described
above. After this delay, the blower will operate at low speed until the engine coolant temperature rises above
56
°
C (133
°
F), and then the blower speed will increase to the objective speed.
Start up from usual or HOT SOAK Condition (Automatic mode)
The blower will begin operation momentarily after the AUTO switch is pressed. The blower speed will gradu-
ally rise to the objective speed over a time period of 3 seconds or less (actual time depends on the objective
blower speed).
SJIA0526E
ATC-74
TROUBLE DIAGNOSIS
Revision: 2006 August
2006 Murano
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 low speed will vary depending on the sunload. During conditions of low or no sunload, the blower
speed is at duty ratio 25%. During high sunload conditions, the unified meter and A/C amp. raise the blower
speed (duty ratio 49%).
Fan Speed Control Specification
COMPONENT DESCRIPTION
Brush-less Motor
The blower motor utilizes a brush-less motor with a rotating magnet.
Quietness is improved over previous motors where the brush was
the point of contact and the coil rotated.
DIAGNOSIS PROCEDURE FOR BLOWER MOTOR
SYMPTOM: Blower motor operation is malfunctioning.
RJIA1996E
ZHA152H
SJIA0266E
TROUBLE DIAGNOSIS
ATC-75
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1.
CHECK POWER SUPPLY FOR BLOWER MOTOR
1.
Disconnect blower motor connector.
2.
Turn ignition switch ON.
3.
Check voltage between blower motor harness connector M70
terminal 1 and ground.
OK or NG
OK
>> GO TO 2.
NG
>> Check power supply circuit and 15A fuses [Nos. 10 and
11, located in the fuse block (J/B)]. Refer to
"FUSE BLOCK - JUNCTION BOX (J/B)"
●
If fuse are OK, check harness for open circuit. Repair or replace if necessary.
●
If fuse are NG, check harness for short circuit and replace fuse.
2.
CHECK BLOWER MOTOR GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Check continuity between blower motor harness connector M70
terminal 3 and ground.
OK or NG
OK
>> GO TO 3.
NG
>> Repair harness or connector.
3.
CHECK CIRCUIT CONTINUITY BETWEEN BLOWER MOTOR AND UNIFIED METER AND A/C AMP.
1.
Disconnect unified meter and A/C amp. connector.
2.
Check continuity between blower motor harness connector M70
terminal 2 and unified meter and A/C amp. harness connector
M51 terminal 53.
OK or NG
OK
>> GO TO 4.
NG
>> Repair harness or connector.
4.
CHECK UNIFIED METER AND A/C AMP. OUTPUT SIGNAL
1.
Reconnect blower motor connector and unified meter and A/C
amp. connector.
2.
Turn ignition switch ON.
3.
Change the fan speed from Lo to Hi, and check the duty ratios
between the blower motor harness connector M70 terminal 2
1 – Ground
: Battery voltage
RJIA1997E
3 – Ground
: Continuity should exist.
RJIA1998E
2 – 53
: Continuity should exist.
RJIA1999E
RJIA2000E
ATC-76
TROUBLE DIAGNOSIS
Revision: 2006 August
2006 Murano
and ground by using an oscilloscope. Normal terminal 2 drive signal duty ratios are shown in the table
below.
OK or NG
OK
>> Replace blower motor after confirming the fan air flow does not change.
NG
>> Replace unified meter and A/C amp.
COMPONENT INSPECTION
Blower Motor
Confirm smooth rotation of the blower motor.
●
Ensure that there are no foreign particles inside the blower unit.
RJIA1792E
RJIA1793E
TROUBLE DIAGNOSIS
ATC-77
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Magnet Clutch Circuit
NJS000B5
SYMPTOM: Magnet clutch does not engage.
INSPECTION FLOW
*1
ATC-104, "Intake Sensor Circuit"
*2
ATC-95, "Ambient Sensor Circuit"
*3
ATC-48, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 13.
*4
ATC-78, "DIAGNOSIS PROCEDURE
FOR MAGNET CLUTCH"
*5
ATC-88, "TROUBLE DIAGNOSIS
FOR UNUSUAL PRESSURE"
*6
*7
ATC-48, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 4 to 6.
*8
SJIA1162E
ATC-78
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SYSTEM DESCRIPTION
Unified meter and A/C amp. controls compressor operation by ambient temperature and signal from ECM.
Low Temperature Protection Control
Unified meter and A/C amp. will turn the compressor ON or OFF as determined by a signal detected by intake
sensor.
When intake air temperature is higher than 4
°
C (39
°
F), the compres-
sor turns ON. The compressor turns OFF when intake air tempera-
ture is lower than 2.5
°
C (37
°
F).
DIAGNOSIS 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 to
ATC-48, "FUNCTION CONFIRMATION PROCEDURE"
, see No. 11.
OK or NG
OK
>> GO TO 2.
NG
>> Malfunctioning intake sensor: Refer to
ATC-104, "Intake Sensor Circuit"
.
2.
PERFORM AUTO ACTIVE TEST
Refer to
.
Does the magnet clutch operate?
YES
>>
●
WITH CONSULT-II: GO TO 5.
●
WITHOUT CONSULT-II: GO TO 6.
NO
>> Check 10A fuse (No. 79, located in IPDM E/R). Refer to
PG-25, "IPDM E/R Terminal Arrange-
and GO TO 3.
RHA094GD
SJIA1232E
TROUBLE DIAGNOSIS
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3.
CHECK CIRCUIT CONTINUITY BETWEEN IPDM E/R AND COMPRESSOR
1.
Turn ignition switch OFF.
2.
Disconnect IPDM E/R connector and compressor connector.
3.
Check continuity between IPDM E/R harness connector E8 ter-
minal 33 and compressor harness connector F28 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
>> 1. Replace IPDM E/R.
2. Go to self-diagnosis procedure
and perform self-
diagnosis STEP-4. Confirm that magnet clutch opera-
tion normal.
NG
>> 1. Replace compressor.
2. Go to self-diagnosis procedure
and perform self-
diagnosis STEP-4. Confirm that magnet clutch operation normal.
5.
CHECK BCM INPUT (COMPRESSOR ON) SIGNAL
Check compressor ON/OFF signal. Refer to
OK or NG
OK
>> GO TO 8.
NG
>> GO TO 6.
6.
CHECK CIRCUIT CONTINUITY BETWEEN BCM AND UNIFIED METER AND A/C AMP.
1.
Turn ignition switch OFF.
2.
Disconnect BCM connector and unified meter and A/C amp.
connector.
3.
Check continuity between BCM harness connector M34 terminal
27 and unified meter and A/C amp. harness connector M51 ter-
minal 42.
OK or NG
OK
>> GO TO 7.
NG
>> Repair harness or connector.
33 – 1
: Continuity should exist.
RJIA2004E
RJIA2005E
A/C SW ON
: AIR COND SW ON
A/C SW OFF
: AIR COND SW OFF
RJIA1111E
27 – 42
: Continuity should exist.
RJIA2006E
ATC-80
TROUBLE DIAGNOSIS
Revision: 2006 August
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7.
CHECK VOLTAGE FOR UNIFIED METER AND A/C AMP. (COMPRESSOR ON SIGNAL)
1.
Reconnect BCM connector and unified meter and A/C amp.
connector.
2.
Turn ignition switch ON.
3.
Check voltage between unified meter and A/C amp. harness
connector M51 terminal 42 and ground.
OK or NG
OK
>> GO TO 8.
NG-1
>> If the voltage is approx. 5 V when A/C switch is ON: Replace unified meter and A/C amp.
NG-2
>> If the voltage is approx. 0 V when A/C switch is OFF: Replace BCM.
8.
CHECK REFRIGERANT PRESSURE SENSOR
WITH CONSULT-II
1.
Start the engine.
2.
Check voltage of refrigerant pressure sensor. Refer to
EC-127, "CONSULT-II Reference Value in Data
.
WITHOUT CONSULT-II
1.
Start the engine.
2.
Check voltage between ECM harness connector F101 terminal
70 and ground.
OK or NG
OK
>>
●
WITH CONSULT-II: GO TO 9.
●
WITHOUT CONSULT-II: GO TO 10.
NG
>> Refer to
EC-653, "REFRIGERANT PRESSURE SENSOR"
Terminals
Condition
Voltage
(+)
(
−
)
Unified meter and
A/C amp. connector
Terminal No.
M51
42
Ground
A/C switch: ON
(Blower motor
operates.)
Approx. 0 V
OFF switch: ON
(A/C system:
OFF)
Approx. 5 V
RJIA2007E
Terminals
Condition
Voltage
(+)
(
−
)
ECM
connector
Terminal No.
F101
70
Ground
A/C switch: ON
(Blower motor
operates.)
Approx. 1.0 - 4.0 V
PBIB1188E
TROUBLE DIAGNOSIS
ATC-81
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9.
CHECK BCM INPUT (FAN ON) SIGNAL
Check FAN ON/OFF signal. Refer to
OK or NG
OK
>> GO TO 12.
NG
>> GO TO 10.
10.
CHECK CIRCUIT CONTINUITY BETWEEN BCM AND UNIFIED METER AND A/C AMP.
1.
Turn ignition switch OFF.
2.
Disconnect BCM connector and unified meter and A/C amp.
connector.
3.
Check continuity between BCM harness connector M34 terminal
28 and unified meter and A/C amp. harness connector M51 ter-
minal 57.
OK or NG
OK
>> GO TO 11.
NG
>> Repair harness or connector.
11.
CHECK VOLTAGE FOR UNIFIED METER AND A/C AMP. (FAN ON SIGNAL)
1.
Reconnect BCM connector and unified meter and A/C amp.
connector.
2.
Turn ignition switch ON.
3.
Check voltage between unified meter and A/C amp. harness
connector M51 terminal 57 and ground.
OK or NG
OK
>> GO TO 12.
NG-1
>> If the voltage is approx. 5 V when blower motor is ON: Replace unified meter and A/C amp.
NG-2
>> If the voltage is approx. 0 V when blower motor is OFF: Replace BCM.
FAN CONTROL DIAL ON
: FAN ON SIG ON
FAN CONTROL DIAL OFF
: FAN ON SIG OFF
RJIA1111E
28 – 57
: Continuity should exist.
RJIA2009E
Terminals
Condition
Voltage
(+)
(
−
)
Unified meter
and A/C amp.
connector
Terminal
No.
M51
57
Ground
Fan control dial: ON
(Blower motor oper-
ates.)
Approx. 0 V
Fan control dial: OFF
Approx. 5 V
RJIA2010E
ATC-82
TROUBLE DIAGNOSIS
Revision: 2006 August
2006 Murano
12.
CHECK CAN COMMUNICATION
Check CAN communication. Refer to
BCS-13, "CAN Communication Inspection Using CONSULT-II (Self-
●
BCM – ECM
●
ECM – IPDM E/R
●
ECM – Unified meter and A/C amp.
OK or NG
OK
>> Replace ECM.
NG
>> Repair or replace malfunctioning part(s).
COMPONENT INSPECTION
Refrigerant Pressure Sensor
The refrigerant pressure sensor is attached to the condenser.
Make sure that the A/C refrigerant pressure and the sensor output
voltage are within the specified range as shown in the A/C operating
condition figure. Refer to
RJIA1795E
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TROUBLE DIAGNOSIS
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Insufficient Cooling
NJS000B6
SYMPTOM: Insufficient cooling
INSPECTION FLOW
SJIA1230E
ATC-84
TROUBLE DIAGNOSIS
Revision: 2006 August
2006 Murano
*1
ATC-48, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 4 to 6.
*2
ATC-66, "Air Mix Door Motor Circuit"
*3
*4
ATC-53, "AUXILIARY MECHANISM:
TEMPERATURE SETTING TRIM-
MER"
*5
ATC-48, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 13.
*6
*7
ATC-72, "Blower Motor Circuit"
*8
ATC-77, "Magnet Clutch Circuit"
*9
ATC-85, "PERFORMANCE TEST
DIAGNOSIS"
*10
*11
ATC-6, "CONTAMINATED REFRIG-
ERANT"
*12
*13
TROUBLE DIAGNOSIS
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PERFORMANCE TEST DIAGNOSIS
*1
*2
*3
ATC-88, "TROUBLE DIAGNOSIS
FOR UNUSUAL PRESSURE"
*4
ATC-66, "Air Mix Door Motor Circuit"
SJIA1226E
ATC-86
TROUBLE DIAGNOSIS
Revision: 2006 August
2006 Murano
*1
ATC-135, "Check Disc to Pulley
Clearance"
*2
ATC-72, "Blower Motor Circuit"
*3
SJIA1642E
TROUBLE DIAGNOSIS
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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 condition
Indoors or in the shade (in a well-ventilated place)
Doors
Closed
Door windows
Open
Hood
Open
TEMP.
Max. COLD
Mode switch
(Ventilation) set
Recirculation (REC) switch
(Recirculation) set
Fan (blower) speed
Max. 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)
50 - 60
20 (68)
5.3 - 6.5 (42 - 44)
25 (77)
9.7 - 11.5 (49 - 53)
30 (86)
13.8 - 16.3 (57 - 61)
35 (95)
18.0 - 21.2 (64 - 70)
40 (104)
22.2 - 25.7 (72 - 78)
60 - 70
20 (68)
6.5 - 7.7 (44 - 46)
25 (77)
11.5 - 13.3 (53 - 56)
30 (86)
16.3 - 18.8 (61 - 66)
35 (95)
21.2 - 24.0 (70 - 75)
40 (104)
25.7 - 29.2 (78 - 85)
Ambient air
High-pressure (Discharge side)
kPa (kg/cm
2
, psi)
Low-pressure (Suction side)
kPa (kg/cm
2
, psi)
Relative humidity
%
Air temperature
°
C (
°
F)
50 - 70
20 (68)
680 - 840
(6.94 - 8.57, 98.6 - 121.8)
160 - 198
(1.63 - 2.02, 23.2 - 28.7)
25 (77)
800 - 985
(8.16 - 10.05, 116.0 - 142.8)
198 - 245
(2.02 - 2.50, 28.7 - 35.5)
30 (86)
940 - 1,150
(9.59 - 11.73, 136.3 - 166.8)
225 - 278
(2.30 - 2.84, 32.6 - 40.3)
35 (95)
1,160 - 1,410
(11.83 - 14.38, 168.2 - 204.5)
273 - 335
(2.78 - 3.42, 39.6 - 48.6)
40 (104)
1,325 - 1,620
(13.52 - 16.52, 192.1 - 234.9)
325 - 398
(3.32 - 4.06, 47.1 - 57.7)
ATC-88
TROUBLE DIAGNOSIS
Revision: 2006 August
2006 Murano
TROUBLE DIAGNOSIS FOR UNUSUAL PRESSURE
Whenever system’s high and/or low side pressure(s) is/are unusual, diagnose using a manifold gauge. The
marker above the gauge scale in the following tables indicates the standard (usual) pressure range. Since the
standard (usual) pressure, however, differs from vehicle to vehicle, refer to above table (Ambient air tempera-
ture-to-operating pressure table).
Both High- and Low-pressure Sides are Too High
High-pressure Side is Too High and Low-pressure Side is Too Low
Gauge indication
Refrigerant cycle
Probable cause
Corrective action
Both high- and low-pressure sides
are too high.
The pressure return to normal
soon after water is splashed
on condenser.
Excessive refrigerant charge
in refrigeration cycle.
Reduce refrigerant until speci-
fied pressure is obtained.
Air suction by cooling fan is
insufficient.
Insufficient condenser cooling
performance.
↓
1. Condenser fins are clogged.
2. Improper fan rotation of
cooling fan.
●
Clean condenser.
●
Check and repair cooling fan
as necessary.
●
Low-pressure pipe is not
cold.
●
When compressor is
stopped high-pressure
value quickly drops by
approximately 196 kPa (2
kg/cm
2
, 28 psi). It then
decreases gradually there-
after.
Poor heat exchange in con-
denser
(After compressor operation
stops, high-pressure
decreases too slowly.).
↓
Air in refrigeration cycle.
Evacuate repeatedly and
recharge system.
Engine tends to overheat.
Engine cooling systems mal-
function.
Check and repair each engine
cooling system.
●
An area of the low-pres-
sure pipe is colder than
areas near the evaporator
outlet.
●
Low-pressure pipe is
sometimes covered with
frost.
●
Excessive liquid refrigerant
on low-pressure side.
●
Excessive refrigerant dis-
charge flow.
●
Expansion valve is open a
little compared with the
specification.
↓
Improper expansion valve
adjustment.
Replace expansion valve.
AC359A
Gauge indication
Refrigerant cycle
Probable cause
Corrective action
High-pressure side is too high and
low-pressure side is too low.
Upper side of condenser and
high-pressure side are hot,
however, liquid tank is not so
hot.
High-pressure tube or parts
located between compressor
and condenser are clogged or
crushed.
●
Check and repair or replace
malfunctioning parts.
●
Check lubricant for contami-
nation.
AC360A
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