Nissan Murano Z50 (2006 year). Manual — part 6
TROUBLE DIAGNOSIS
ATC-57
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Revision: 2006 August
2006 Murano
Power Supply and Ground Circuit for Auto Amp.
NJS000AY
SYMPTOM: A/C system does not come on.
INSPECTION FLOW
COMPONENT DESCRIPTION
Unified Meter and A/C Amp. (Automatic Amplifier)
The unified meter and A/C amp. has a built-in microcomputer which
processes information sent from various sensors needed for air con-
ditioner operation. The air mix door motor, mode door motor, intake
door motor, blower motor and compressor are then controlled.
When the various switches and temperature control dials are oper-
ated, data is input to the unified meter and A/C amp. from the display
control unit using CAN communication.
Self-diagnosis functions are also built into unified meter and A/C
amp. to provide quick check of malfunctions in the auto air condi-
tioner system.
*1
ATC-58, "DIAGNOSIS PROCE-
DURE FOR A/C SYSTEM"
*2
*3
AV-121, "Example of Symptoms
Possible No Malfunction"
*4
AV-39, "A/C and AV Switch Self-
Diagnosis Function"
SJIA1158E
RJIA1758E
ATC-58
TROUBLE DIAGNOSIS
Revision: 2006 August
2006 Murano
Potentio Temperature Control (PTC)
The PTC is built into the A/C and AV switch. It can be set at an inter-
val of 0.5
°
C (1.0
°
F) in the 18
°
C (60
°
F) to 32
°
C (90
°
F) temperature
range by turning temperature control dial. The set temperature is dis-
played.
DIAGNOSIS PROCEDURE FOR A/C SYSTEM
SYMPTOM: A/C system does not come on.
1.
CHECK POWER SUPPLY CIRCUIT FOR UNIFIED METER AND A/C AMP.
1.
Disconnect unified meter and A/C amp. connector.
2.
Check voltage between unified meter and A/C amp. harness
connector M50 terminals 21, 22 and 35, unified meter and A/C
amp. harness connector M51 terminal 46 and ground.
OK or NG
OK
>> GO TO 2.
NG
>> Check 10A and 15A fuses [Nos. 6, 10, 11, 12 and 19, located in the fuse block (J/B)]. Refer to
69, "FUSE BLOCK - JUNCTION BOX (J/B)"
●
If fuses are OK, check harness for open circuit. Repair or replace if necessary.
●
If fuses are NG, check harness for short circuit and replace fuse.
SJIA1188E
SJIA0301E
Terminals
Ignition switch position
(+)
(
−
)
OFF
ACC
ON
Unified meter
and A/C amp.
connector
Terminal
No.
M50
21
Ground
Battery
voltage
Battery
voltage
Battery
voltage
M50
22
Approx. 0 V
Approx. 0 V
Battery
voltage
M50
35
Approx. 0 V
Battery
voltage
Battery
voltage
M51
46
Approx. 0 V
Approx. 0 V
Battery
voltage
RJIA1984E
TROUBLE DIAGNOSIS
ATC-59
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Revision: 2006 August
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2.
CHECK GROUND CIRCUIT FOR UNIFIED METER AND A/C AMP.
1.
Turn ignition switch OFF.
2.
Check continuity between unified meter and A/C amp. harness
connector M50 terminal 29, 30 and ground.
OK or NG
OK
>> Replace unified meter and A/C amp.
NG
>> Repair harness or connector.
LAN System Circuit
NJS000AZ
SYMPTOM: Mode door motor, intake door motor and/or air mix door motor(s) does not operate normally.
DIAGNOSIS PROCEDURE FOR LAN CIRCUIT
1.
CHECK POWER SUPPLY FOR UNIFIED METER AND A/C AMP.
1.
Turn ignition switch ON.
2.
Check voltage between unified meter and A/C amp. harness
connector M51 terminal 54 and ground.
OK or NG
OK
>> GO TO 2.
NG
>> Replace unified meter and A/C amp.
29, 30 – Ground
: Continuity should exist.
RJIA1985E
RJIA1775E
54 – Ground
: Battery voltage
RJIA1986E
ATC-60
TROUBLE DIAGNOSIS
Revision: 2006 August
2006 Murano
2.
CHECK SIGNAL FOR UNIFIED METER AND A/C AMP.
Confirm A/C LAN signal between unified meter and A/C amp. har-
ness connector M51 terminal 43 and ground using an oscilloscope.
OK or NG
OK
>> GO TO 3.
NG
>> Replace unified meter and A/C amp.
3.
CHECK POWER SUPPLY FOR EACH DOOR MOTOR
Check voltage between each door motor harness connector terminal
1 and ground.
OK or NG
OK
>> GO TO 4.
NG
>> Repair harness or connector.
4.
CHECK SIGNAL FOR EACH DOOR MOTOR
Confirm A/C LAN signal between each door motor harness connec-
tor terminal 3 and ground using an oscilloscope.
OK or NG
OK
>> GO TO 5.
NG
>> Repair harness or connector.
Terminals
Voltage
(+)
(
−
)
Unified meter
and A/C amp.
connector
Terminal No.
M51
43
Ground
RJIA1987E
SJIA1453J
1 – Ground
: Battery voltage
RJIA1988E
Door motor
Terminals
Voltage
(+)
(
−
)
Connector
Terminal
No.
Mode
M252
3
Ground
Air mix
(Driver
side)
M253
3
Air mix
(Passen-
ger side)
M254
3
Intake
M255
3
RJIA1989E
SJIA1453J
TROUBLE DIAGNOSIS
ATC-61
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Revision: 2006 August
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5.
CHECK EACH DOOR MOTOR GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect each door motor connector.
3.
Check continuity between each door motor harness connector
terminal 2 and ground.
OK or NG
OK
>> GO TO 6.
NG
>> Repair harness or connector.
6.
CHECK MOTOR OPERATION
1.
Reconnect each door motor connector.
2.
Turn ignition switch ON.
3.
Confirm operation of each door motor.
OK or NG
OK
>> (Return to operate normally.)
●
Poor contact in motor connector.
NG
>> (Does not operate normally.)
●
GO TO 7.
7.
CHECK AIR MIX DOOR MOTOR AND INTAKE DOOR MOTOR OPERATION
1.
Turn ignition switch OFF.
2.
Disconnect mode door motor, air mix door motor (driver side, passenger side), and intake door motor con-
nectors.
3.
Reconnect air mix door motor (driver side, passenger side) and intake door motor connectors.
4.
Turn ignition switch ON.
5.
Confirm operation of air mix door motor (driver side, passenger side) and intake door motor.
OK or NG
OK
>> [Air mix (driver side, passenger side) and intake door motors operate normally.]
●
Replace mode door motor.
NG
>> [Air mix (driver side, passenger side) and intake door motors does not operate normally.]
●
GO TO 8.
8.
CHECK MODE DOOR MOTOR AND INTAKE DOOR MOTOR OPERATION
1.
Turn ignition switch OFF.
2.
Disconnect air mix door motor (driver side, passenger side) connectors.
3.
Reconnect mode door motor connector.
4.
Turn ignition switch ON.
5.
Confirm operation of mode door motor and intake door motor.
OK or NG
OK
>> (Mode and intake door motors operate normally.)
●
GO TO 10.
NG
>> (Mode and intake door motors does not operate normally.)
●
GO TO 9.
2 – Ground
: Continuity should exist.
RJIA1990E
ATC-62
TROUBLE DIAGNOSIS
Revision: 2006 August
2006 Murano
9.
CHECK MODE DOOR MOTOR AND AIR MIX DOOR MOTOR OPERATION
1.
Turn ignition switch OFF.
2.
Disconnect intake door motor connector.
3.
Reconnect air mix door motor (driver side, passenger side) connectors.
4.
Turn ignition switch ON.
5.
Confirm operation of mode door motor and air mix door motor (driver side, passenger side).
OK or NG
OK
>> [Mode and air mix door motor (driver side, passenger side) operate normally.]
●
Replace intake door motor.
NG
>> [Mode and air mix door motor (driver side, passenger side) does not operate normally.]
●
Replace display and A/C auto amp.
10.
CHECK AIR MIX DOOR MOTOR OPERATION
1.
Turn ignition switch OFF.
2.
Disconnect air mix door motor (driver side) connector.
3.
Turn ignition switch ON.
4.
Confirm operation of air mix door motor (passenger side).
OK or NG
OK
>> [Air mix door motor (passenger side) operates normally.]
●
Replace air mix door motor (driver side).
NG
>> [Air mix door motor (passenger side) does not operate normally.]
●
Replace air mix door motor (passenger side).
TROUBLE DIAGNOSIS
ATC-63
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Revision: 2006 August
2006 Murano
Mode Door Motor Circuit
NJS000B0
SYMPTOM
●
Air outlet does not change.
●
Mode door motor does not operate normally.
INSPECTION FLOW
*1
*2
*3
ATC-104, "Intake Sensor Circuit"
*4
ATC-48, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 4 to 6.
*5
ATC-95, "Ambient Sensor Circuit"
*6
ATC-98, "In-vehicle Sensor Circuit"
*7
ATC-101, "Sunload Sensor Circuit"
*8
ATC-68, "Air Mix Door Motor PBR
Circuit"
*9
ATC-48, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 13.
*10
ATC-59, "DIAGNOSIS PROCEDURE
FOR LAN CIRCUIT"
*11
*12
SJIA1159E
ATC-64
TROUBLE DIAGNOSIS
Revision: 2006 August
2006 Murano
SYSTEM DESCRIPTION
Component Parts
Mode door control system components are:
●
Unified meter and A/C amp.
●
Mode door motor (LCU)
●
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
The unified meter and A/C amp. receives data from each of the sensors. The unified meter and A/C amp.
sends air mix door, mode door and intake door opening angle data to the air mix door motor LCUs, mode door
motor LCU and intake door motor LCU.
The air mix door motors, mode door motor and intake door motor read their respective signals according to the
address signal. Opening angle indication signals received from the unified meter and A/C amp. and each of
the motor position sensors are compared by the LCUs in each door motor with the existing decision and open-
ing angles. Subsequently, HOT/COLD, DEF/VENT and FRE/REC operation is selected. The new selection
data are returned to the unified meter and A/C amp.
Mode Door Control Specification
RJIA1777E
RJIA1778E
TROUBLE DIAGNOSIS
ATC-65
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Revision: 2006 August
2006 Murano
COMPONENT DESCRIPTION
Mode Door Motor
The mode door motor is attached to the heater & cooling unit assem-
bly. It rotates so that air is discharged from the outlet set by the uni-
fied meter and A/C amp. Motor rotation is conveyed to a link which
activates the mode door.
DIAGNOSIS PROCEDURE FOR MODE DOOR MOTOR
SYMPTOM: Mode door motor does not operate normally.
Perform diagnosis procedure. Refer to
ATC-59, "DIAGNOSIS PROCEDURE FOR LAN CIRCUIT"
.
RJIA3961E
ATC-66
TROUBLE DIAGNOSIS
Revision: 2006 August
2006 Murano
Air Mix Door Motor Circuit
NJS000B1
SYMPTOM
●
Discharge air temperature does not change.
●
Air mix door motor does not operate normally.
INSPECTION FLOW
*1
ATC-48, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 4 to 6.
*2
ATC-95, "Ambient Sensor Circuit"
*3
ATC-98, "In-vehicle Sensor Circuit"
*4
ATC-101, "Sunload Sensor Circuit"
*5
ATC-68, "Air Mix Door Motor PBR Cir-
cuit"
*6
ATC-48, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 13.
*7
*8
*9
*10
*11
ATC-104, "Intake Sensor Circuit"
SJIA1229E
TROUBLE DIAGNOSIS
ATC-67
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Revision: 2006 August
2006 Murano
SYSTEM DESCRIPTION
Component Parts
Air mix door control system components are:
●
Unified meter and A/C amp.
●
Air mix door motor (LCU)
●
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
The unified meter and A/C amp. receives data from each of the sensors. The unified meter and A/C amp.
sends air mix door, mode door and intake door opening angle data to the air mix door motor LCUs, mode door
motor LCU and intake door motor LCU.
The air mix door motors, mode door motor and intake door motor read their respective signals according to the
address signal. Opening angle indication signals received from the unified meter and A/C amp. and each of
the motor position sensors are compared by the LCUs in each door motor with the existing decision and open-
ing angles. Subsequently, HOT/COLD, DEF/VENT and FRE/REC operation is selected. The new selection
data are returned to the unified meter and A/C amp.
Air Mix Door Control Specification
RJIA1781E
RJIA1782E
ATC-68
TROUBLE DIAGNOSIS
Revision: 2006 August
2006 Murano
COMPONENT DESCRIPTION
Air Mix Door Motor
The air mix door motors are attached to the heater & cooling unit
assembly. It rotates so that the air mix door is opened or closed to a
position set by the unified meter and A/C amp. Motor rotation is then
conveyed through a shaft and the air mix door position feedback is
then sent to the unified meter and A/C amp. by PBR built-in air mix
door motor.
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR
SYMPTOM: Discharge air temperature does not change.
Perform diagnosis procedure. Refer to
ATC-59, "DIAGNOSIS PROCEDURE FOR LAN CIRCUIT"
.
Air Mix Door Motor PBR Circuit
NJS000B2
SYMPTOM
●
Discharge air temperature does not change.
●
PBR circuit is open or shorted.
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR MOTOR PBR
Perform diagnosis procedure. Refer to
ATC-59, "DIAGNOSIS PROCEDURE FOR LAN CIRCUIT"
.
RJIA3963E
RJIA3964E
TROUBLE DIAGNOSIS
ATC-69
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Revision: 2006 August
2006 Murano
Intake Door Motor Circuit
NJS000B3
SYMPTOM
●
Intake door does not change.
●
Intake door motor does not operate normally.
INSPECTION FLOW
*1
ATC-48, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 4 to 6.
*2
ATC-95, "Ambient Sensor Circuit"
*3
ATC-98, "In-vehicle Sensor Circuit"
*4
ATC-101, "Sunload Sensor Circuit"
*5
ATC-68, "Air Mix Door Motor PBR
Circuit"
*6
ATC-48, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 13.
*7
*8
*9
*10
*11
ATC-104, "Intake Sensor Circuit"
SJIA1160E
ATC-70
TROUBLE DIAGNOSIS
Revision: 2006 August
2006 Murano
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 door motor, intake door 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 shifting mode position D/F, when the DEF or OFF switches are
pressed, or when A/C switch is OFF, the unified meter and A/C amp. sets the intake door at the FRE position.
Intake Door Control Specification
PJIA0122E
RJIA1787E
TROUBLE DIAGNOSIS
ATC-71
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Revision: 2006 August
2006 Murano
COMPONENT DESCRIPTION
Intake Door Motor
The intake door motor is attached to the blower 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.
DIAGNOSIS PROCEDURE FOR INTAKE DOOR MOTOR
SYMPTOM: Intake door motor does not operate normally.
Perform diagnosis procedure. Refer to
ATC-59, "DIAGNOSIS PROCEDURE FOR LAN CIRCUIT"
.
RJIA1788E
ATC-72
TROUBLE DIAGNOSIS
Revision: 2006 August
2006 Murano
Blower Motor Circuit
NJS000B4
SYMPTOM: Blower motor operation is malfunctioning.
INSPECTION FLOW
*1
*2
ATC-104, "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-74, "DIAGNOSIS PROCEDURE
FOR BLOWER MOTOR"
*7
*8
ATC-95, "Ambient Sensor Circuit"
*9
ATC-98, "In-vehicle Sensor Circuit"
*10
ATC-101, "Sunload Sensor Circuit"
*11
EC-209, "DTC P0117, P0118 ECT
SENSOR"
SJIA1161E
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