Nissan Murano Z50 (2003 year). Manual — part 8
TROUBLE DIAGNOSIS
ATC-91
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Revision; 2004 April
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SYSTEM DESCRIPTION
Component Parts
Intake door control system components are:
●
Unified meter and A/C amp.
●
Intake door motor (LCU)
●
A/C LAN system (PBR built-in mode motor and air mix door motor)
●
In-vehicle sensor
●
Ambient sensor
●
Sunload sensor
●
Intake sensor
System Operation
The intake door control determines intake door position based on the ambient temperature, the intake air tem-
perature and the in-vehicle temperature. When the DEFROST, or OFF switches are pushed or A/C switch is
OFF, the unified meter and A/C amp. sets the intake door at the FRESH position.
Intake Door Control Specification
RJIA1786E
RJIA1787E
ATC-92
TROUBLE DIAGNOSIS
Revision; 2004 April
2003 Murano
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 unified meter and A/C amp. Motor
rotation is conveyed to a lever which activates the intake door.
DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR
SYMPTOM: Intake door motor does not operate normally.
Perform diagnostic procedure for
ATC-81, "DIAGNOSTIC PROCEDURE FOR LAN CIRCUIT"
.
RJIA1788E
TROUBLE DIAGNOSIS
ATC-93
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Revision; 2004 April
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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-124, "Intake Sensor Circuit"
*3
ATC-69, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 4.
*4
ATC-69, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 6.
*5
ATC-69, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 13.
*6
ATC-95, "DIAGNOSTIC PROCE-
DURE FOR BLOWER MOTOR"
*7
.
*8
ATC-115, "Ambient Sensor Circuit"
.
*9
ATC-118, "In-vehicle Sensor Circuit"
.
*10
ATC-121, "Sunload Sensor Circuit"
*11
EC-203, "DTC P0117, P0118 ECT
SENSOR"
.
RJIA1789E
ATC-94
TROUBLE DIAGNOSIS
Revision; 2004 April
2003 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 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-95
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Revision; 2004 April
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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 display and A/C auto 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-96
TROUBLE DIAGNOSIS
Revision; 2004 April
2003 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-97
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Revision; 2004 April
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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-98
TROUBLE DIAGNOSIS
Revision; 2004 April
2003 Murano
Magnet Clutch Circuit
AJS000ZC
SYMPTOM: Magnet clutch does not engage.
INSPECTION FLOW
*1
ATC-124, "Intake Sensor Circuit"
*2
ATC-115, "Ambient Sensor Circuit"
.
*3
ATC-69, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 13.
*4
ATC-98, "Magnet Clutch Circuit"
*5
ATC-108, "TROUBLE DIAGNOSIS
FOR UNUSUAL PRESSURE"
*6
*7
ATC-69, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 4 to 6.
*8
RJIA1794E
TROUBLE DIAGNOSIS
ATC-99
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Revision; 2004 April
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SYSTEM DESCRIPTION
Unified meter and A/C amp. controls compressor operation by intake air 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-69, "FUNCTION CONFIRMATION PROCEDURE"
, see No. 11.
OK or NG
OK
>> GO TO 2.
NG
>> Malfunctioning intake sensor: Refer to
ATC-124, "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
RJIA1392E
ATC-100
TROUBLE DIAGNOSIS
Revision; 2004 April
2003 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 E7 ter-
minal 28 (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 M37 terminal
58 (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.
28 – 1
: Continuity should exist.
RJIA0908E
SJIA0197E
A/C SW ON
: COMP ON SIG ON
A/C SW OFF
: COMP ON SIG OFF
SJIA0270E
58 – 42
: Continuity should exist.
RJIA1445E
TROUBLE DIAGNOSIS
ATC-101
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Revision; 2004 April
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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 (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
.
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-634, "REFRIGERANT PRESSURE SENSOR"
Terminals
Condition
Voltage
(+)
(-)
Auto 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 con-
nector
Terminal No.
(wire color)
F101
70 (W)
Ground
A/C switch: ON
Approx. 0.36 - 3.88V
RJIA2008E
ATC-102
TROUBLE DIAGNOSIS
Revision; 2004 April
2003 Murano
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 M37 terminal
65 (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
.
FAN CONTROL DIAL ON
: FAN ON SIG ON
FAN CONTROL DIAL OFF
: FAN ON SIG OFF
SJIA0270E
65 – 57
: Continuity should exist.
RJIA1448E
Terminals
Condition
Voltage
(+)
(-)
Auto amp.
connector
Terminal No.
(wire color)
M51
57 (SB)
Ground
A/C switch: ON
Blower motor
operates
Approx. 0V
A/C switch: OFF
Approx. 5V
RJIA2010E
TROUBLE DIAGNOSIS
ATC-103
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Revision; 2004 April
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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).
COMPONENT INSPECTION
Refrigerant Pressure Sensor
The refrigerant pressure sensor is attached to the condenser.
RJIA1795E
ATC-104
TROUBLE DIAGNOSIS
Revision; 2004 April
2003 Murano
Insufficient Cooling
AJS000ZD
SYMPTOM: Insufficient cooling
INSPECTION FLOW
*1
ATC-69, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 4 to 6.
*2
ATC-87, "Air Mix Door Motor Circuit"
. *3
.
*4
ATC-74, "AUXILIARY MECHANISM:
TEMPERATURE SETTING TRIM-
MER"
.
*5
ATC-69, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 13.
*6
*7
ATC-93, "Blower Motor Circuit"
.
*8
ATC-98, "Magnet Clutch Circuit"
.
*9
ATC-105, "PERFORMANCE TEST
DIAGNOSES"
.
*10
.
*11
ATC-6, "CONTAMINATED REFRIG-
ERANT"
*12
.
*13
RJIA1796E
TROUBLE DIAGNOSIS
ATC-105
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ATC
Revision; 2004 April
2003 Murano
PERFORMANCE TEST DIAGNOSES
*1
.
*2
*3
ATC-108, "TROUBLE DIAGNOSIS
FOR UNUSUAL PRESSURE"
*4
ATC-87, "Air Mix Door Motor Circuit"
RJIA1601E
ATC-106
TROUBLE DIAGNOSIS
Revision; 2004 April
2003 Murano
*1
ATC-153, "Removal and Installation
of Compressor Clutch"
*2
ATC-93, "Blower Motor Circuit"
*3
RJIA1595E
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