Nissan Murano Z50 (2004 year). Manual — part 6
TROUBLE DIAGNOSIS
ATC-57
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Revision: 2004 November
2004 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-78, "Magnet Clutch Circuit"
If all operational checks are OK (symptom cannot be duplicated), go
to malfunction Simulation Tests in
GI-26, "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-58, "DIAGNOSTIC PROCE-
DURE FOR A/C SYSTEM"
*2
*3
AV-93, "Trouble Diagnosis Chart by
Symptom"
*4
AV-159, "A/C and AV Switch Self-
Diagnosis Function"
RJIA1772E
ATC-58
TROUBLE DIAGNOSIS
Revision: 2004 November
2004 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.
The unified meter and A/C amp. is unitized with control mechanisms.
When the various switches and temperature dials are operated, data
is input to the unified meter and A/C amp. from the display unit/dis-
play control unit using CAN communication.
Self-diagnostic 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 dial. The set temperature is displayed.
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM
SYMPTOM: A/C system does not come on.
RJIA1758E
RJIA1773E
SJIA0301E
TROUBLE DIAGNOSIS
ATC-59
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Revision: 2004 November
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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 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 as necessary.
●
If fuses are NG, replace fuse and check harness for short circuit. Repair or replace as neces-
sary.
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. 0V
Approx. 0V
Battery
voltage
M50
35 (P/B)
Approx. 0V
Battery
voltage
Battery
voltage
M51
46 (W/L)
Approx. 0V
Approx. 0V
Battery
voltage
RJIA1984E
29, 30 – Ground
: Continuity should exist.
RJIA1985E
ATC-60
TROUBLE DIAGNOSIS
Revision: 2004 November
2004 Murano
LAN System Circuit
AJS000Z6
SYMPTOM: Mode door motor, intake door motor and/or air mix door motor(s) does not operate normally.
DIAGNOSTIC 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
TROUBLE DIAGNOSIS
ATC-61
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Revision: 2004 November
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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 MOTOR
Check voltage between mode door motor harness connector M252
terminal 1 (L/W), driver side air mix door motor harness connector
M253 terminal 1 (L/W), passenger side air mix door motor harness
connector M254 terminal 1 (L/W), intake door motor harness con-
nector M255 terminal 1 (L/W) and ground.
OK or NG
OK
>> GO TO 4.
NG
>> Repair harness or connector.
4.
CHECK SIGNAL FOR MOTOR
Confirm A/C LAN signal between mode door motor harness connec-
tor M252 terminal 3 (L/B), driver side air mix door motor harness
connector M253 terminal 3 (L/B), passenger side air mix door motor
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
RJIA1989E
ATC-62
TROUBLE DIAGNOSIS
Revision: 2004 November
2004 Murano
harness connector M254 terminal 3 (L/B), intake door motor harness connector M255 terminal 3 (L/B) and
ground using an oscilloscope.
OK or NG
OK
>> GO TO 5.
NG
>> Repair harness or connector.
5.
CHECK MOTOR GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect door motor connector.
3.
Check continuity between mode door motor harness connector
M252 terminal 2 (B), driver side air mix door motor harness con-
nector M253 terminal 2 (B), passenger side air mix door motor
harness connector M254 terminal 2 (B), intake door motor har-
ness connector M255 terminal 2 (B) and ground.
OK or NG
OK
>> GO TO 6.
NG
>> Repair harness or connector.
6.
CHECK MOTOR OPERATION
1.
Turn ignition switch OFF.
2.
Disconnect each door motor connector.
3.
Reconnect each door motor connector.
4.
Turn ignition switch ON.
5.
Confirm each door motor operation.
OK or NG
OK
>> (Return to operate normally.)
●
Poor contact in motor connector.
NG
>> (Does not operate normally.)
●
GO TO 7.
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)
HAK0652D
2 – Ground
: Continuity should exist.
RJIA1990E
TROUBLE DIAGNOSIS
ATC-63
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Revision: 2004 November
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7.
CHECK MODE DOOR MOTOR OPERATION
1.
Turn ignition switch OFF.
2.
Disconnect mode door motor and air mix door motor (driver side, passenger side) connector.
3.
Reconnect mode door motor connector.
4.
Turn ignition switch ON.
5.
Confirm the mode door motor operation.
OK or NG
OK
>> (Mode door motor operates normally.)
●
GO TO 8.
NG
>> (Mode door motor does not operate normally.)
●
Repair mode door motor.
8.
CHECK AIR MIX DOOR MOTOR OPERATION
1.
Turn ignition switch OFF.
2.
Disconnect mode door motor connector.
3.
Reconnect air mix door motor connector (driver side, passenger side).
4.
Turn ignition switch ON.
5.
Confirm the air mix door motor operation.
OK or NG
OK
>> (Air mix door motor operates normally.)
●
GO TO 9.
NG
>> (Air mix door motor does not operate normally.)
●
GO TO 10.
9.
CHECK INTAKE DOOR MOTOR OPERATION
1.
Turn ignition switch OFF.
2.
Disconnect air mix door motor connector (driver side, passenger side).
3.
Reconnect intake door motor connector.
4.
Turn ignition switch ON.
5.
Confirm the intake door motor operation.
OK or NG
OK
>> (Intake door motor operates normally.)
●
Repair unified meter and A/C amp.
NG
>> (Intake door motor does not operate normally.)
●
Repair intake door motor.
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 the air mix door motor (passenger side) operation.
OK or NG
OK
>> (Air mix door motor operates normally.)
●
Repair driver side air mix door motor.
NG
>> (Air mix door motor does not operate normally.)
●
Repair passenger side air mix door motor.
ATC-64
TROUBLE DIAGNOSIS
Revision: 2004 November
2004 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-105, "Intake Sensor Circuit"
*4
ATC-48, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 4 to 6.
*5
ATC-96, "Ambient Sensor Circuit"
.
*6
ATC-99, "In-Vehicle Sensor Circuit"
*7
ATC-102, "Sunload Sensor Circuit"
*8
ATC-69, "Air Mix Door Motor PBR
Circuit"
.
*9
ATC-48, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 13.
*10
ATC-60, "DIAGNOSTIC PROCE-
DURE FOR LAN CIRCUIT"
*11
.
*12
RJIA1776E
TROUBLE DIAGNOSIS
ATC-65
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Revision: 2004 November
2004 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 motor with the existing decision and opening
angles. Subsequently, HOT/COLD or DEFROST/VENT or FRESH/RECIRCULATION operation is selected.
The new selection data is returned to the unified meter and A/C amp.
Mode Door Control Specification
RJIA1777E
RJIA1778E
ATC-66
TROUBLE DIAGNOSIS
Revision: 2004 November
2004 Murano
COMPONENT DESCRIPTION
Mode Door Motor
The mode door motor is attached to the heater & cooling unit. It
rotates so that air is discharged from the outlet set by the unified
meter and A/C amp. Motor rotation is conveyed to a link which acti-
vates the mode door.
DIAGNOSTIC PROCEDURE FOR MODE DOOR MOTOR
SYMPTOM: Mode door motor does not operate normally.
Perform diagnostic procedure for
ATC-60, "DIAGNOSTIC PROCEDURE FOR LAN CIRCUIT"
.
RJIA1779E
TROUBLE DIAGNOSIS
ATC-67
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Revision: 2004 November
2004 Murano
Air Mix Door Motor Circuit
AJS000Z8
SYMPTOM:
●
Discharge air temperature does not change.
●
Air mix door motor does not operate.
INSPECTION FLOW
*1
ATC-48, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 4 to 6.
*2
ATC-96, "Ambient Sensor Circuit"
*3
ATC-99, "In-Vehicle Sensor Circuit"
*4
ATC-102, "Sunload Sensor Circuit"
*5
ATC-69, "Air Mix Door Motor PBR Cir-
cuit"
*6
ATC-48, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 13.
*7
*8
.
*9
*10
*11
*12
ATC-105, "Intake Sensor Circuit"
RJIA1780E
ATC-68
TROUBLE DIAGNOSIS
Revision: 2004 November
2004 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 motor 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 motor with the existing decision and opening
angles. Subsequently, HOT/COLD or DEFROST/VENT or FRESH/RECIRCULATION operation is selected.
The new selection data is returned to the unified meter and A/C amp.
Air Mix Door Control Specification
RJIA1781E
RJIA1782E
TROUBLE DIAGNOSIS
ATC-69
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ATC
Revision: 2004 November
2004 Murano
COMPONENT DESCRIPTION
Air Mix Door Motor
The air mix door motor is attached to the heater & cooling unit. 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 is then fed back to the
unified meter and A/C amp. by PBR built-in air mix door motor.
DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR
SYMPTOM: Discharge air temperature does not change.
Perform diagnostic procedure for
ATC-60, "DIAGNOSTIC PROCEDURE FOR LAN CIRCUIT"
.
Air Mix Door Motor PBR Circuit
AJS000Z9
SYMPTOM:
●
Discharge air temperature does not change.
●
PBR circuit is open or shorted.
DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR PBR
Perform diagnostic procedure for
ATC-60, "DIAGNOSTIC PROCEDURE FOR LAN CIRCUIT"
.
RJIA1783E
RJIA1784E
ATC-70
TROUBLE DIAGNOSIS
Revision: 2004 November
2004 Murano
Intake Door Motor Circuit
AJS0010Y
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-96, "Ambient Sensor Circuit"
*3
ATC-99, "In-Vehicle Sensor Circuit"
*4
ATC-102, "Sunload Sensor Circuit"
*5
ATC-69, "Air Mix Door Motor PBR
Circuit"
*6
ATC-48, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 13.
*7
*8
*9
*10
.
*11
ATC-105, "Intake Sensor Circuit"
RJIA1785E
TROUBLE DIAGNOSIS
ATC-71
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ATC
Revision: 2004 November
2004 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 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-72
TROUBLE DIAGNOSIS
Revision: 2004 November
2004 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-60, "DIAGNOSTIC PROCEDURE FOR LAN CIRCUIT"
.
RJIA1788E
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