Nissan Murano Z50 (2004 year). Manual — part 7
TROUBLE DIAGNOSIS
ATC-73
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Revision: 2004 November
2004 Murano
Blower Motor Circuit
AJS001F4
SYMPTOM:
●
Blower motor operation is malfunctioning.
●
Blower motor operation is malfunctioning under out of starting fan speed control.
INSPECTION FLOW
*1
*2
ATC-105, "Intake Sensor Circuit"
*3
ATC-48, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 4.
*4
ATC-48, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 6.
*5
ATC-48, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 13.
*6
ATC-75, "DIAGNOSTIC PROCE-
DURE FOR BLOWER MOTOR"
*7
*8
ATC-96, "Ambient Sensor Circuit"
*9
ATC-99, "In-Vehicle Sensor Circuit"
*10
ATC-102, "Sunload Sensor Circuit"
*11
EC-175, "DTC P0117, P0118 ECT
SENSOR"
.
RJIA1789E
ATC-74
TROUBLE DIAGNOSIS
Revision: 2004 November
2004 Murano
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
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), at which time 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 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).
RJIA1790E
TROUBLE DIAGNOSIS
ATC-75
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Revision: 2004 November
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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
low speed is usual low speed (duty ratio 25%). During high sunload conditions, the unified meter and A/C
amp. causes the blower speed to increase (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.
DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR
SYMPTOM: Blower motor operation is malfunctioning under starting
fan speed control.
RJIA1996E
ZHA152H
SJIA0266E
ATC-76
TROUBLE DIAGNOSIS
Revision: 2004 November
2004 Murano
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 (W/L) 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 OK, check for open circuit in wiring harness. Repair or replace as necessary.
●
If NG, replace fuse and check wiring harness for short circuit. Repair or replace as necessary.
2.
CHECK BLOWER MOTOR GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Check continuity between blower motor harness connector M70
terminal 3 (B) 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 (L/Y) and unified meter and A/C amp. harness con-
nector M51 terminal 53 (L/Y).
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.
Vary the fan speed between Lo and Hi and confirm the duty
ratios between 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
TROUBLE DIAGNOSIS
ATC-77
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ATC
Revision: 2004 November
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(L/Y) and ground using an oscilloscope. Usual No. 2 terminal drive signal duty ratios are shown in the
table below.
OK or NG
OK
>> GO TO 5.
NG
>> Replace unified meter and A/C amp.
5.
CHECK BLOWER MOTOR DRIVE SIGNAL
If the fan air flow does not change, usual No. 2 (L/Y) terminal drive signal duty ratios are shown in the table
above.
OK or NG
OK
>> Replace blower motor.
NG
>> INSPECTION END
COMPONENT INSPECTION
Blower Motor
Confirm smooth rotation of the blower motor.
●
Ensure that there are no foreign particles inside the blower unit.
RJIA1792E
RJIA1793E
ATC-78
TROUBLE DIAGNOSIS
Revision: 2004 November
2004 Murano
Magnet Clutch Circuit
AJS000ZC
SYMPTOM: Magnet clutch does not engage.
INSPECTION FLOW
*1
ATC-105, "Intake Sensor Circuit"
.
*2
ATC-96, "Ambient Sensor Circuit"
*3
ATC-48, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 13.
*4
ATC-79, "DIAGNOSTIC PROCE-
DURE FOR MAGNET CLUTCH"
.
*5
ATC-89, "TROUBLE DIAGNOSIS
FOR UNUSUAL PRESSURE"
.
*6
*7
ATC-48, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 4 to 6.
*8
.
RJIA1794E
TROUBLE DIAGNOSIS
ATC-79
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ATC
Revision: 2004 November
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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).
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 to
ATC-48, "FUNCTION CONFIRMATION PROCEDURE"
, see No. 11.
OK or NG
OK
>> GO TO 2.
NG
>> Malfunctioning intake sensor: Refer to
ATC-105, "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), and GO TO 3.
RHA094GD
RJIA2003E
ATC-80
TROUBLE DIAGNOSIS
Revision: 2004 November
2004 Murano
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 E8 ter-
minal 33 (Y/B) and compressor harness connector F28 terminal
1 (Y/B).
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.
NG
>> Replace magnet clutch. Refer to
and Installation of Compressor Clutch"
.
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 (GR) and unified meter and A/C amp. harness connector
M51 terminal 42 (GR).
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
TROUBLE DIAGNOSIS
ATC-81
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Revision: 2004 November
2004 Murano
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 (GR) and ground.
OK or NG
OK
>> GO TO 8.
NG-1
>> If the voltage is approx. 5V when A/C switch is ON: Replace unified meter and A/C amp.
NG-2
>> If the voltage is approx. 0V 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-121, "CONSULT-II Reference Value in Data
WITHOUT CONSULT-II
1.
Start the engine.
2.
Check voltage between ECM harness connector F101 terminal
70 (W) and ground.
OK or NG
OK
>>
●
WITH CONSULT-II
GO TO 9.
●
WITHOUT CONSULT-II
GO TO 10.
NG
>> Refer to
EC-633, "REFRIGERANT PRESSURE SENSOR"
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.
Terminals
Condition
Voltage
(+)
(-)
Unified meter and
A/C amp. connector
Terminal No.
(wire color)
M51
42 (GR)
Ground
A/C switch: ON
Approx. 0V
A/C switch: OFF
Approx. 5V
RJIA2007E
Terminals
Condition
Voltage
(+)
(-)
ECM
connector
Terminal No.
(wire color)
F101
70 (W)
Ground
A/C switch: ON
Approx. 1.0 - 4.0V
PBIB1188E
FAN CONTROL DIAL ON
: FAN ON SIG ON
FAN CONTROL DIAL OFF
: FAN ON SIG OFF
RJIA1111E
ATC-82
TROUBLE DIAGNOSIS
Revision: 2004 November
2004 Murano
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 (SB) and unified meter and A/C amp. harness connector M51
terminal 57 (SB).
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 (SB) and ground.
OK or NG
OK
>> GO TO 12.
NG-1
>> If the voltage is approx. 5V when blower motor is ON: Replace unified meter and A/C amp.
NG-2
>> If the voltage is approx. 0V when blower motor is OFF: Replace BCM. Refer to
.
12.
CHECK CAN COMMUNICATION
Check CAN communication. Refer to
ATC-33, "CAN Communication System Description"
●
BCM – ECM
●
ECM – IPDM E/R
●
ECM – Unified meter and A/C amp.
OK or NG
OK
>> INSPECTION END
NG
>> Repair or replace malfunctioning part(s).
28 – 57
: Continuity should exist.
RJIA2009E
Terminals
Condition
Voltage
(+)
(-)
Unified meter
and A/C amp.
connector
Terminal No.
(wire color)
M51
57 (SB)
Ground
Fan control dial: ON
(Blower motor oper-
ates)
Approx. 0V
Fan control dial: OFF
Approx. 5V
RJIA2010E
TROUBLE DIAGNOSIS
ATC-83
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Revision: 2004 November
2004 Murano
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
RJIA2954E
ATC-84
TROUBLE DIAGNOSIS
Revision: 2004 November
2004 Murano
Insufficient Cooling
AJS000ZD
SYMPTOM: Insufficient cooling
INSPECTION FLOW
RJIA3009E
TROUBLE DIAGNOSIS
ATC-85
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ATC
Revision: 2004 November
2004 Murano
*1
ATC-48, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 4 to 6.
*2
ATC-67, "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-73, "Blower Motor Circuit"
*8
ATC-78, "Magnet Clutch Circuit"
*9
ATC-86, "PERFORMANCE TEST
DIAGNOSIS"
.
*10
*11
ATC-6, "CONTAMINATED REFRIG-
ERANT"
*12
*13
ATC-86
TROUBLE DIAGNOSIS
Revision: 2004 November
2004 Murano
PERFORMANCE TEST DIAGNOSIS
*1
*2
.
*3
ATC-89, "TROUBLE DIAGNOSIS
FOR UNUSUAL PRESSURE"
.
*4
ATC-67, "Air Mix Door Motor Circuit"
RJIA1601E
TROUBLE DIAGNOSIS
ATC-87
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ATC
Revision: 2004 November
2004 Murano
*1
ATC-133, "Removal and Installation
of Compressor Clutch"
*2
ATC-73, "Blower Motor Circuit"
*3
RJIA1595E
ATC-88
TROUBLE DIAGNOSIS
Revision: 2004 November
2004 Murano
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
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)
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