Nissan Murano Z50 (2005 year). Manual — part 6
TROUBLE DIAGNOSIS
ATC-57
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ATC
Revision: 2005 August
2005 Murano
CHECKING INTAKE AIR
1.
Press recirculation (REC) switch. Recirculation indicator should
illuminate.
2.
Press fresh (FRE) switch one time. Fresh indicator should illumi-
nate.
3.
Listen for intake door position change. (Slight change of blower
sound can be heard.)
If NG, go to trouble diagnosis procedure for
.
If OK, continue the check.
NOTE:
Confirm that the compressor clutch is engaged (sound or visual
inspection) and intake door position is at FRESH when the DEF or D/F is selected.
CHECKING TEMPERATURE DECREASE
1.
Turn temperature control dial (driver side) counterclockwise until
18
°
C (60
°
F) is displayed.
2.
Check for cold air at discharge air outlets.
If NG, go to trouble diagnosis procedure for
.
If OK, continue the check.
CHECKING TEMPERATURE INCREASE
1.
Turn temperature control dial (driver side) clockwise until 32
°
C
(90
°
F) is displayed.
2.
Check for hot air at discharge air outlets.
If NG, go to trouble diagnosis procedure for
If OK, continue the check.
CHECK A/C SWITCH
1.
Press AUTO switch and A/C switch.
2.
A/C switch indicator will turn ON.
●
Confirm that the compressor clutch engages (sound or visual
inspection).
If NG, go to trouble diagnosis procedure for
.
If OK, continue the check.
RJIA1768E
RJIA1769E
RJIA1770E
RJIA2099E
ATC-58
TROUBLE DIAGNOSIS
Revision: 2005 August
2005 Murano
CHECKING AUTO MODE
1.
Press AUTO switch and A/C switch.
2.
Display should indicate AUTO.
●
Confirm that the compressor clutch engages (sound or visual
inspection). (Discharge air and blower speed will depend on
ambient, in-vehicle, and set temperatures.)
If NG, go to trouble diagnosis procedure for
and Ground Circuit for Auto Amp."
, then if necessary, trouble diag-
nosis procedure for
ATC-79, "Magnet Clutch Circuit"
If all operational checks are OK (symptom cannot be duplicated), go
to Malfunction Simulation Tests in
GI-27, "How to Perform Efficient
Diagnosis for an Electrical Incident"
and perform tests as outlined to
simulate driving conditions environment. If symptom appears, refer
to
and perform applicable trouble diagnosis procedures.
Power Supply and Ground Circuit for Auto Amp.
AJS000Z5
SYMPTOM: A/C system does not come on.
INSPECTION FLOW
RJIA1771E
*1
ATC-59, "DIAGNOSIS PROCE-
DURE FOR A/C SYSTEM"
*2
*3
AV-94, "Trouble Diagnosis Chart by
Symptom"
*4
AV-166, "A/C and AV Switch Self-
Diagnosis Function"
RJIA1772E
TROUBLE DIAGNOSIS
ATC-59
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Revision: 2005 August
2005 Murano
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 dials are operated, data
is input to the unified meter and A/C amp. from the DISPLAY UNIT/
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.
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.
RJIA1758E
RJIA1773E
SJIA0301E
ATC-60
TROUBLE DIAGNOSIS
Revision: 2005 August
2005 Murano
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 (Y/R), 22 (G) and 35 (P/B), unified
meter and A/C amp. harness connector M51 terminal 46 (W/L)
and ground.
OK or NG
OK
>> GO TO 2.
NG
>> Check 10 A and 15 A fuses [Nos. 6, 10, 11, 12 and 19, located in the fuse block (J/B)]. Refer to
PG-70, "FUSE BLOCK - JUNCTION BOX (J/B)"
.
●
If fuses are OK, check harness for open circuit. Repair or replace if necessary.
●
If fuses are NG, replace fuse and check harness for short circuit. Repair or replace if necessary.
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 (B), 30 (B) and ground.
OK or NG
OK
>> Replace unified meter and A/C amp.
NG
>> Repair harness or connector.
Terminals
Ignition switch position
(+)
(–)
OFF
ACC
ON
Unified meter
and A/C amp.
connector
Terminal
No.
(wire color)
M50
21 (Y/R)
Ground
Battery
voltage
Battery
voltage
Battery
voltage
M50
22 (G)
Approx. 0 V
Approx. 0 V
Battery
voltage
M50
35 (P/B)
Approx. 0 V
Battery
voltage
Battery
voltage
M51
46 (W/L)
Approx. 0 V
Approx. 0 V
Battery
voltage
RJIA1984E
29, 30 – Ground
: Continuity should exist.
RJIA1985E
TROUBLE DIAGNOSIS
ATC-61
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ATC
Revision: 2005 August
2005 Murano
LAN System Circuit
AJS000Z6
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 (L/W) and ground.
OK or NG
OK
>> GO TO 2.
NG
>> Replace unified meter and A/C amp.
RJIA1775E
54 – Ground
: Battery voltage
RJIA1986E
ATC-62
TROUBLE DIAGNOSIS
Revision: 2005 August
2005 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 (L/B) and ground using an oscillo-
scope.
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 (L/W) 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 (L/B) 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.
(wire color)
M51
43 (L/B)
Ground
RJIA1987E
HAK0652D
1 – Ground
: Battery voltage
RJIA1988E
Door motor
Terminals
Voltage
(+)
(–)
Connector
Terminal
No.
(wire color)
Mode
M252
3 (L/B)
Ground
Air mix
(Driver
side)
M253
3 (L/B)
Air mix
(Passen-
ger side)
M254
3 (L/B)
Intake
M255
3 (L/B)
RJIA1989E
HAK0652D
TROUBLE DIAGNOSIS
ATC-63
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Revision: 2005 August
2005 Murano
5.
CHECK MOTOR GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect door motor connector.
3.
Check continuity between each door motor harness connector
terminal 2 (B) 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 OPERATION OF AIR MIX DOOR MOTOR AND INTAKE DOOR MOTOR
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 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 OPERATION OF MODE DOOR MOTOR AND INTAKE DOOR MOTOR
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 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-64
TROUBLE DIAGNOSIS
Revision: 2005 August
2005 Murano
9.
CHECK OPERATION OF MODE DOOR MOTOR AND AIR MIX DOOR MOTOR
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 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 OPERATION OF AIR MIX DOOR MOTOR
1.
Turn ignition switch OFF.
2.
Disconnect air mix door motor (driver side) connector.
3.
Turn ignition switch ON.
4.
Confirm 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-65
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ATC
Revision: 2005 August
2005 Murano
Mode Door Motor Circuit
AJS000Z7
SYMPTOM:
●
Air outlet does not change.
●
Mode door motor does not operate normally.
INSPECTION FLOW
*1
*2
*3
ATC-106, "Intake Sensor Circuit"
*4
ATC-49, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 4 to 6.
*5
ATC-97, "Ambient Sensor Circuit"
*6
ATC-100, "In-vehicle Sensor Circuit"
*7
ATC-103, "Sunload Sensor Circuit"
*8
ATC-70, "Air Mix Door Motor PBR
Circuit"
*9
ATC-49, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 13.
*10
ATC-61, "DIAGNOSIS PROCEDURE
FOR LAN CIRCUIT"
*11
*12
SJIA1315E
ATC-66
TROUBLE DIAGNOSIS
Revision: 2005 August
2005 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 LCU, mode door
motor LCU and intake door motor LCU.
The air mix door motor, 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 FRESH/RECIRCULATION 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-67
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ATC
Revision: 2005 August
2005 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-61, "DIAGNOSIS PROCEDURE FOR LAN CIRCUIT"
.
RJIA1779E
ATC-68
TROUBLE DIAGNOSIS
Revision: 2005 August
2005 Murano
Air Mix Door Motor Circuit
AJS000Z8
SYMPTOM:
●
Discharge air temperature does not change.
●
Air mix door motor does not operate normally.
INSPECTION FLOW
*1
ATC-49, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 4 to 6.
*2
ATC-97, "Ambient Sensor Circuit"
*3
ATC-100, "In-vehicle Sensor Circuit"
*4
ATC-103, "Sunload Sensor Circuit"
*5
ATC-70, "Air Mix Door Motor PBR Cir-
cuit"
*6
ATC-49, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 13.
*7
*8
*9
*10
*11
ATC-106, "Intake Sensor Circuit"
SJIA0525E
TROUBLE DIAGNOSIS
ATC-69
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ATC
Revision: 2005 August
2005 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 LCU, mode door
motor LCU and intake door motor LCU.
The air mix door motor, 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 FRESH/RECIRCULATION 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-70
TROUBLE DIAGNOSIS
Revision: 2005 August
2005 Murano
COMPONENT DESCRIPTION
Air Mix Door Motor
The air mix door motor is 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
sent conveyed through a shaft and the air mix door position feed-
back 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-61, "DIAGNOSIS PROCEDURE FOR LAN CIRCUIT"
.
Air Mix Door Motor PBR Circuit
AJS000Z9
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-61, "DIAGNOSIS PROCEDURE FOR LAN CIRCUIT"
.
RJIA1783E
RJIA1784E
TROUBLE DIAGNOSIS
ATC-71
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Revision: 2005 August
2005 Murano
Intake Door Motor Circuit
AJS0010Y
SYMPTOM:
●
Intake door does not change.
●
Intake door motor does not operate normally.
INSPECTION FLOW
*1
ATC-49, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 4 to 6.
*2
ATC-97, "Ambient Sensor Circuit"
*3
ATC-100, "In-vehicle Sensor Circuit"
*4
ATC-103, "Sunload Sensor Circuit"
*5
ATC-70, "Air Mix Door Motor PBR
Circuit"
*6
ATC-49, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 13.
*7
*8
*9
*10
*11
ATC-106, "Intake Sensor Circuit"
RJIA1785E
ATC-72
TROUBLE DIAGNOSIS
Revision: 2005 August
2005 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 the DEF, or OFF switches are pressed 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
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