Nissan Murano Z50 (2003 year). Manual — part 7
TROUBLE DIAGNOSIS
ATC-75
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ATC
Revision; 2004 April
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AUXILIARY MECHANISM: FOOT POSITION SETTING TRIMMER
Wind distribution ratio in FOOT mode can be set.
Operating procedures for this trimmer are as follows:
●
Begin Self-diagnosis STEP-5 mode. Refer to
ATC-68, "Self-diagnosis Function"
.
●
Turn fan control dial clockwise to set system in auxiliary mode.
●
Display shows 61 in auxiliary mechanism. It takes approximately 3 seconds.
●
Press the mode switch as desired.
AUXILIARY MECHANISM: INLET PORT MEMORY FUNCTION
When ignition key is turned from OFF to ON, inlet port can be set to AUTO or manual.
Operating procedures for this trimmer are as follows:
●
Begin Self-diagnosis STEP-5 mode. Refer to
ATC-68, "Self-diagnosis Function"
.
●
Turn fan control dial clockwise to set system in auxiliary mode.
●
Display shows 61 in auxiliary mechanism. It takes approximately 3 seconds.
●
Press the recirculation (REC) and fresh (FRE) switch as desired.
RJIA1764E
Switch
LED status of
REC/FRE
switch
Setting status
Setting changeover method
REC
ON
Manual REC status is memorized. (Initial setting)
REC SW: ON
OFF
AUTO control
FRE
ON
Manual FRE status is memorized.
FRE SW: ON
OFF
AUTO control (Initial setting)
ATC-76
TROUBLE DIAGNOSIS
Revision; 2004 April
2003 Murano
Operational Check
AJS000Z4
The purpose of the operational check is to confirm that the system operates properly.
CHECKING MEMORY FUNCTION
1.
Set the temperature to 32
°
C (90
°
F).
2.
Press OFF switch.
3.
Turn ignition switch OFF.
4.
Turn ignition switch ON.
5.
Press the AUTO switch.
6.
Confirm that the set temperature remains at previous tempera-
ture.
7.
Press OFF switch.
If NG, go to trouble diagnosis procedure for
.
If OK, continue with next check.
CHECKING BLOWER
1.
Turn fan control dial clockwise. Blower should operate on low
speed. The fan symbol should have one blade lit.
2.
Turn fan control dial clockwise again, and continue checking
blower speed and fan symbol until all speeds are checked.
3.
Leave blower on MAX speed.
If NG, go to trouble diagnosis procedure for
If OK, continue with next check.
CHECKING DISCHARGE AIR
1.
Press MODE switch and DEF switch.
2.
Each position indicator should change shape.
3.
Confirm that discharge air comes out according to the air distri-
bution table. Refer to
If NG, go to trouble diagnosis procedure for
If OK, continue with next 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.
Conditions
: Engine running and at usual operating temperature
RJIA1765E
RJIA1766E
RJIA1767E
RJIA1761E
TROUBLE DIAGNOSIS
ATC-77
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Revision; 2004 April
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CHECKING RECIRCULATION
1.
Press recirculation (REC) switch one time. Recirculation indica-
tor should illuminate.
2.
Press fresh (FRE) switch one time. Fresh indicator should illumi-
nate.
3.
Listen for intake door position change (you should hear blower
sound change slightly).
If NG, go to trouble diagnosis procedure for
.
If OK, continue with next 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 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 with next check.
CHECKING TEMPERATURE INCREASE
1.
Turn temperature 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 with next 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 with next check.
RJIA1768E
RJIA1769E
RJIA1770E
RJIA2099E
ATC-78
TROUBLE DIAGNOSIS
Revision; 2004 April
2003 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-98, "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-78, "Power Supply and Ground
Circuit for Auto Amp."
*2
*3
AV-103, "Trouble Diagnosis Chart by
Symptom"
*4
.
RJIA1772E
TROUBLE DIAGNOSIS
ATC-79
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Revision; 2004 April
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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/
DISPLAY 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
ATC-80
TROUBLE DIAGNOSIS
Revision; 2004 April
2003 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 10A and 15A fuses [Nos. 6, 10, 11, 12 and 19, located in the fuse block (J/B)]. Refer to
87, "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
Auto 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
TROUBLE DIAGNOSIS
ATC-81
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ATC
Revision; 2004 April
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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.
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.
RJIA1775E
54 – Ground
: Battery voltage
RJIA1986E
Terminals
Voltage
(+)
(-)
Auto amp.
connector
Terminal No.
(wire color)
M51
43 (L/B)
Ground
RJIA1987E
HAK0652D
ATC-82
TROUBLE DIAGNOSIS
Revision; 2004 April
2003 Murano
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
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.
1 – Ground
: Battery voltage
RJIA1988E
Door motor
Terminals
Voltage
(+)
(-)
Con-
nector
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
2 – Ground
: Continuity should exist.
RJIA1990E
TROUBLE DIAGNOSIS
ATC-83
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Revision; 2004 April
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6.
CHECK MOTOR OPERATION
Disconnect and reconnect the motor connector and confirm the motor operation.
OK or NG
OK
>> (Return to operate normally.)
●
Poor contact in motor connector.
NG
>> (Does not operate normally.)
●
GO TO 7.
7.
CHECK MODE DOOR MOTOR OPERATION
1.
Disconnect mode door motor and air mix door motor (driver side, passenger side) connector.
2.
Reconnect mode door motor connector and 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.
Disconnect mode door motor connector.
2.
Reconnect air mix door motor connector (driver side, passenger side) and 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.
Disconnect air mix door motor connector (driver side, passenger side).
2.
Reconnect intake door motor connector and 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.
Disconnect air mix door motor (driver side) connector.
2.
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-84
TROUBLE DIAGNOSIS
Revision; 2004 April
2003 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-124, "Intake Sensor Circuit"
*4
ATC-69, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 4 to 6.
*5
ATC-115, "Ambient Sensor Circuit"
*6
ATC-118, "In-vehicle Sensor Cir-
cuit"
*7
ATC-121, "Sunload Sensor Circuit"
.
*8
ATC-87, "Air Mix Door Motor Cir-
cuit"
*9
ATC-69, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 13.
*10
ATC-81, "DIAGNOSTIC PROCE-
DURE FOR LAN CIRCUIT"
*11
ATC-86, "COMPONENT DESCRIP-
TION"
*12
RJIA1776E
TROUBLE DIAGNOSIS
ATC-85
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ATC
Revision; 2004 April
2003 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 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.
RJIA1777E
ATC-86
TROUBLE DIAGNOSIS
Revision; 2004 April
2003 Murano
Mode Door Control Specification
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-81, "DIAGNOSTIC PROCEDURE FOR LAN CIRCUIT"
.
RJIA1778E
RJIA1779E
TROUBLE DIAGNOSIS
ATC-87
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ATC
Revision; 2004 April
2003 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-69, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 4 to 6.
*2
ATC-115, "Ambient Sensor Circuit"
*3
ATC-118, "In-vehicle Sensor Cir-
cuit"
.
*4
ATC-121, "Sunload Sensor Circuit"
*5
ATC-89, "Air Mix Door Motor PBR
Circuit"
*6
ATC-69, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 13.
*7
*8
*9
*10
.
*11
*12
ATC-124, "Intake Sensor Circuit"
RJIA1780E
ATC-88
TROUBLE DIAGNOSIS
Revision; 2004 April
2003 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 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-89
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ATC
Revision; 2004 April
2003 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
Perform diagnostic procedure for
ATC-81, "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-81, "DIAGNOSTIC PROCEDURE FOR LAN CIRCUIT"
.
RJIA1783E
RJIA1784E
ATC-90
TROUBLE DIAGNOSIS
Revision; 2004 April
2003 Murano
Intake Door Motor Circuit
AJS0010Y
SYMPTOM:
●
Intake door does not change.
●
Intake door motor does not operate normally.
INSPECTION FLOW
*1
ATC-69, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 4 to 6.
*2
ATC-115, "Ambient Sensor Circuit"
*3
ATC-118, "In-vehicle Sensor Cir-
cuit"
.
*4
ATC-121, "Sunload Sensor Circuit"
*5
ATC-89, "Air Mix Door Motor PBR
Circuit"
.
*6
ATC-69, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 13.
*7
*8
*9
*10
*11
ATC-124, "Intake Sensor Circuit"
RJIA1785E
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