sensor INFINITI M35 2006 Factory Service Manual

TROUBLE DIAGNOSIS
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Revision: 2006 January2006 M35/M45
Self-diagnosis FunctionNJS000GJ
DESCRIPTION
The self-diagnosis system diagnoses sensors, door motors, blower motor, etc. by system line. Refer to appli-
cable sections (items) for details. Shifting from usual control to the self-diagnosis system is accomplished by
starting the engine (turning the ignition switch ON) and pressing OFF switch for at least 5 seconds. The OFF
switch must be pressed within 10 seconds after starting the engine (ignition switch is turned ON). This system
will be canceled by either pressing AUTO switch or turning the ignition switch OFF. Shifting from one step to
another is accomplished by means of pressing temperature control switch (driver side), as required.
Shifting from STEP-5 to AUXILIARY MECHANISM is accomplished by means of pressing (fan) UP switch.
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ATC-56
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Revision: 2006 January2006 M35/M45
FUNCTION CONFIRMATION PROCEDURE
1. SET IN SELF-DIAGNOSIS MODE
1. Turn ignition switch ON.
2. Set in self-diagnosis mode as follows. Within 10 seconds after starting engine (ignition switch is turned
ON.), press OFF switch for at least 5 seconds.
CAUTION:
If battery voltage drops below 12 V during diagnosis STEP-3, door motor speed becomes slower
and as a result, the system may generate an error even when operation is normal. To avoid this,
start engine before performing this diagnosis.
Former STEP-1 (LEDs and display screen are checked) does not exist in this self-diagnosis func-
tion.
>> GO TO 2.
2. STEP-2: SENSOR CIRCUITS ARE CHECKED FOR OPEN OR SHORT CIRCUIT
Does code No. 20 appear on the display?
YES >> GO TO 3.
NO >> GO TO 13.
3. CHECK TO ADVANCE SELF-DIAGNOSIS STEP-3
Press temperature control (UP) switch (driver side).
Advance to self
-diagnosis STEP-3?
YES >> GO TO 4.
NO >> Replace Multifunction switch. (Temperature control switch is malfunctioning.)
4. CHECK TO RETURN SELF-DIAGNOSIS STEP-2
Press temperature control (DOWN) switch (driver side).
Return to self
-diagnosis STEP-2?
YES >> GO TO 5.
NO >> Malfunctioning multifunction switch or unified meter and A/C amp. Refer to AT C - 111 , "
Self-Diag-
nosis" .
5. STEP-3: MODE DOOR AND INTAKE DOOR POSITIONS ARE CHECKED
Press temperature control (UP) switch (driver side).
Does code No. 30 appear on the display?
YES >> GO TO 6.
NO >> GO TO 14.
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Revision: 2006 January2006 M35/M45
Checks must be made visually, by listening the sound, or by touching air outlets with hand, etc. for improper
operation.
*1: FOOT position during automatic control. Refer to AT C - 6 3 , "
AUXILIARY MECHANISM: FOOT POSITION
SETTING TRIMMER" .
OK or NG
OK >> GO TO 8.
NG >>
Air outlet does not change.
Go to Mode Door Motor Circuit. Refer to AT C - 7 5 , "
Mode Door Motor Circuit" .
Upper ventilator outlet does not change.
Go to Upper Ventilator Door Motor Circuit. Refer to AT C - 8 0 , "
Upper Ventilator Door Motor Cir-
cuit" .
Intake door does not change.
Go to Intake Door Motor Circuit. Refer to AT C - 8 6 , "
Intake Door Motor Circuit" .
Blower motor operation is malfunctioning.
Go to Blower Motor Circuit. Refer to AT C - 8 9 , "
Blower Motor Circuit" .
Magnet clutch does not engage.
Go to Magnet Clutch Circuit. Refer to ATC-94, "
Magnet Clutch Circuit" .
Discharge air temperature does not change.
Go to Air Mix Door Motor Circuit. Refer to AT C - 8 3 , "
Air Mix Door Motor Circuit" .
8. STEP-5: TEMPERATURE OF EACH SENSOR IS CHECKED
1. Press temperature control (UP) switch (driver side).
2. Code No. 51 appears on the display.
>> GO TO 9.
9. CHECK AMBIENT SENSOR
Press (DEF) switch one time. Temperature detected by ambient
sensor is indicated on the display.
NOTE:
If the temperature indicated on the display greatly differs from the
actual temperature, check sensor circuit first, and then check sensor.
OK or NG
OK >> GO TO 10.
NG >> Go to Ambient Sensor Circuit. Refer to AT C - 11 3 , "
Ambi-
ent Sensor Circuit" .
10. CHECK IN-VEHICLE SENSOR
Press (DEF) switch for the second time. Temperature detected
by in-vehicle sensor is indicated on the display.
NOTE:
If the temperature indicated on the display greatly differs from the
actual temperature, check sensor circuit first, and then check sensor.
OK or NG
OK >> GO TO 11.
NG >> Go to In-vehicle Sensor Circuit. Refer to AT C - 11 6 , "
In-
Vehicle Sensor Circuit" .
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Revision: 2006 January2006 M35/M45
11 . CHECK INTAKE SENSOR
Press (DEF) switch for the third time. Temperature detected by
intake sensor is indicated on the display.
NOTE:
If the temperature indicated on the display greatly differs from the
actual temperature, check sensor circuit first, and then check sensor.
OK or NG
OK >> GO TO 12.
NG >> Go to Intake Sensor Circuit. Refer to ATC-122, "
Intake
Sensor Circuit" .
12. CHECK CAN COMMUNICATION ERROR
1. Press intake switch.
2. CAN communication error between the unified meter and A/C
amp. and the AV control unit or NAVI control unit can be
detected as self-diagnosis results. (If plural errors occur, the dis-
play of each error will blink twice for 0-5 second intervals.)
OK or NG
OK >> 1. Turn ignition switch OFF or AUTO switch ON.
2. INSPECTION END
NG >> Go to CAN communication. Refer to DI-36, "
DTC
[U1000] CAN Communication Circuit" .
Unified meter and A/C amp. - AV control unit or NAVI
control unit
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ATC-60
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Revision: 2006 January2006 M35/M45
13. CHECK MALFUNCTIONING SENSOR
Refer to the following chart for malfunctioning code No.
(If two or more sensors malfunction, corresponding code Nos. blink respectively twice.)
*1: Perform self-diagnosis STEP-2 under sunshine.
When performing indoors, aim a light (more than 60 W) at sunload sensor, otherwise code No. 25 will indicate
despite that sunload sensor is functioning properly.
*2: AT C - 11 3 , "
DIAGNOSIS PROCEDURE FOR AMBIENT SENSOR" .
*3: AT C - 11 7 , "
DIAGNOSIS PROCEDURE FOR IN-VEHICLE SENSOR" .
*4: ATC-122, "
DIAGNOSIS PROCEDURE FOR INTAKE SENSOR" .
*5: AT C - 11 9 , "
DIAGNOSIS PROCEDURE FOR SUNLOAD SENSOR" .
*6: AT C - 8 5 , "
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR MOTOR PBR" .
>> INSPECTION END
Code No. Malfunctioning sensor (Including circuits) Reference page
21 /
21 Ambient sensor *2
22 /
22 In-vehicle sensor *3
24 /
24 Intake sensor *4
25 /
25
Sunload sensor *1*5
26 /
26 Air mix door motor PBR (Driver side)
*6
27 /
27 Air mix door motor PBR (Passenger side)
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Revision: 2006 January2006 M35/M45
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, upper
ventilator door motor, intake door motor, blower motor and compres-
sor are then controlled.
When the various switches and temperature control switch are oper-
ated, data is input to the unified meter and A/C amp. from the AV
control unit / NAVI 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 multifunction switch. It can be set at an
interval of 0.5
C (1.0F) in the 18C (60F) to 32C (90F) tempera-
ture range by pressing temperature control switch. The set tempera-
ture is displayed.
DIAGNOSIS PROCEDURE FOR A/C SYSTEM
SYMPTOM: A/C system does not come on.
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*1ATC-37, "Discharge Air Flow"*2AT C - 6 4 , "Operational Check"*3ATC-122, "Intake Sensor Circuit"
*4ATC-56, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 2 to 6.*5AT C - 11 3 , "
Ambient Sensor Circuit"*6AT C - 11 6 , "In-Vehicle Sensor Circuit"
*7ATC-119, "Sunload Sensor Circuit"*8AT C - 8 3 , "Air Mix Door Motor Cir-
cuit"
*9AT C - 5 6 , "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 13.
*10ATC-70, "
DIAGNOSIS PROCE-
DURE FOR LAN CIRCUIT"
*11ATC-140, "MODE DOOR MOTOR"*12AT C - 4 1 , "SYMPTOM TABLE"

ATC-78
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Revision: 2006 January2006 M35/M45
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, upper ventilator door motor, air mix door motor and
intake 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, upper ventilator door and intake door opening angle data to the air mix door
motor LCU, mode door motor LCU, upper ventilator door motor LCU and intake door motor LCU.
The air mix door motor, mode door motor, upper ventilator door motor and intake door motor read their respec-
tive 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 opening angles. Subsequently, HOT/COLD, DEF/VENT, OPEN/SHUT and FRE/REC
operation is selected. The new selection data are returned to the unified meter and A/C amp.
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ATC-80
TROUBLE DIAGNOSIS
Revision: 2006 January2006 M35/M45
Upper Ventilator Door Motor CircuitNJS000GP
SYMPTOM:
Upper ventilator outlet does not change.
Upper ventilator door motor does not operate normally.
INSPECTION FLOW
*1AT C - 5 6 , "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 2.*2ATC-56, "
FUNCTION CONFIRMA-
TION PROCEDURE", see No. 5.*3ATC-56, "
FUNCTION CONFIRMA-
TION PROCEDURE", see No. 6.
*4AT C - 11 9 , "
Sunload Sensor Circuit"*5ATC-56, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 13.*6ATC-70, "
DIAGNOSIS PROCE-
DURE FOR LAN CIRCUIT"
*7ATC-142, "UPPER VENTILATOR
DOOR MOTOR"
*8ATC-64, "Operational Check"*9ATC-41, "SYMPTOM TABLE"
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TROUBLE DIAGNOSIS
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Revision: 2006 January2006 M35/M45
SYSTEM DESCRIPTION
Component Parts
Upper ventilator door control system components are:
Unified meter and A/C amp.
Upper ventilator door motor (LCU)
A/C LAN system (PBR built-in mode door motor, upper ventilator door motor, air mix door motor and
intake door motor)
Sunload 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, upper ventilator door and intake door opening angle data to the air mix door
motor LCU, mode door motor LCU, upper ventilator door motor LCU and intake door motor LCU.
The air mix door motor, mode door motor, upper ventilator door motor and intake door motor read their respec-
tive 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 opening angles. Subsequently, HOT/COLD, DEF/VENT, OPEN/SHUT and FRE/REC
operation is selected. The new selection data are returned to the unified meter and A/C amp.
RJIA4060E