sensor INFINITI M35 2007 Factory Service Manual

ATC-40
TROUBLE DIAGNOSIS
Revision: 2007 April2007 M35/M45
TROUBLE DIAGNOSISPFP:00004
CONSULT-II Function (ECM)NJS000GD
CONSULT-II can display each diagnosis item using the diagnosis test modes shown following.
CONSULT-II BASIC OPERATION
Refer to GI-38, "CONSULT-II Start Procedure" .
DATA MONITOR
Operation Procedure
1. Touch “ENGINE” on “SELECT SYSTEM” screen.
2. Touch “DATA MONITOR” on “SELECT DIAG MODE” screen.
3. Touch “SELECTION FROM MENU” on “DATA MONITOR” screen.
4. When “SELECTION FROM MENU” is selected, touch items to be monitored.
5. Touch “START”.
6. Touch “RECORD” while monitoring, then the status of the monitored item can be recorded. To stop
recording, touch “STOP”.
Display Item List
How to Perform Trouble Diagnosis for Quick and Accurate RepairNJS000GE
WORK FLOW
System part Check item, diagnosis mode Description
ECM Data monitor Displays ECM input data in real time.
Monitor item name
“operation or unit”Contents
AIR COND SIG “ON/OFF” Displays “COMP (ON)/COMP (OFF)” status as judged from air conditioner switch signal.
HEATER FAN SW “ON/OFF” Displays “FAN (ON)/FAN (OFF)” status as judged from blower fan motor switch signal.
IGNITION SW “ON/OFF” Displays “IGN position (ON)/OFF, ACC position (OFF)” status as judged from ignition switch signal.
AC PRESS SEN “V”Displays “Refrigerant pressure sensor for voltage” status as inputted from refrigerant pressure sen-
sor.
*1ATC-65, "Operational Check"
SHA900E

ATC-54
TROUBLE DIAGNOSIS
Revision: 2007 April2007 M35/M45
Auto Amp. Terminals and Reference ValueNJS000GI
Measure voltage between each terminal and ground by referring ter-
minals and reference value for unified meter and A/C amp.
PIN CONNECTOR TERMINAL LAYOUT
TERMINALS AND REFERENCE VALUE FOR UNIFIED METER AND A/C AMP.
RJIA4032E
RJIA4033E
Te r m i n a l
No.Wire
colorItemIgnition
switchConditionVoltag e
(V)
38 L/Y Blower motor control signal ONBlower speed: 1st speed
(manual)
41 V Power supply from ACC ACC — Battery voltage
43 R Intake sensor — — —
44 GR In-vehicle sensor — — —
45 W/V Ambient sensor — — —
46 BR/Y Sunload sensor — — —
53 W/G Power supply from IGN ON — Battery voltage
54 W/G Power supply from BATT OFF — Battery voltage
55 B Ground ON — Approx. 0
56 L CAN-H — — —
59 O/B Intake sensor ground ON — Approx. 0
60 P In-vehicle sensor ground ON — Approx. 0
61 LG/R Ambient sensor ground ON — Approx. 0
62 V/R Sunload sensor ground ON — Approx. 0
SJIA1454J

ATC-56
TROUBLE DIAGNOSIS
Revision: 2007 April2007 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 normal 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 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.
RJIA4034E

TROUBLE DIAGNOSIS
ATC-57
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: 2007 April2007 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.
NOTE:

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 function.
>> 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 - 11 0 , "
Self-diagno-
sis" .
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.
SJIA1778E
SJIA1779E

TROUBLE DIAGNOSIS
ATC-59
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: 2007 April2007 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 4 , "
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 6 , "
Mode Door Motor Circuit" .

Upper ventilator outlet does not change.
Go to Upper Ventilator Door Motor Circuit. Refer to AT C - 7 9 , "
Upper Ventilator Door Motor Cir-
cuit" .

Intake door does not change.
Go to Intake Door Motor Circuit. Refer to AT C - 8 5 , "
Intake Door Motor Circuit" .

Discharge air temperature does not change.
Go to Air Mix Door Motor Circuit. Refer to AT C - 8 2 , "
Air Mix Door Motor Circuit" .

Blower motor operation is malfunctioning.
Go to Blower Motor Circuit. Refer to AT C - 8 8 , "
Blower Motor Circuit" .

Magnet clutch does not engage.
Go to Magnet Clutch Circuit. Refer to AT C - 9 3 , "
Magnet Clutch 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 2 , "
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 5 , "
In-
vehicle Sensor Circuit" .
PJIA0151E
PJIA0152E

ATC-60
TROUBLE DIAGNOSIS
Revision: 2007 April2007 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-121, "
Intake
Sensor Circuit" .
12. CHECK CAN COMMUNICATION ERROR
1. Press intake switch.
2. CAN communication error between each unit that uses the uni-
fied meter and A/C amp. can be detected as self-diagnosis
results. (If plural errors occur, the display 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-35, "
DTC
[U1000] CAN Communication Circuit" .

Unified meter and A/C amp. - AV control unit or NAVI
control unit
PJIA0153E
SJIA1763E

TROUBLE DIAGNOSIS
ATC-61
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: 2007 April2007 M35/M45
13. CHECK MALFUNCTIONING SENSOR AND DOOR MOTOR
Refer to the following chart for malfunctioning code No.
(If two or more sensors and door motors malfunction, corresponding code Nos. indicates 1 second each.)
(If two door motors malfunction, corresponding code Nos. indicates 0.5 second each.)
*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 2 , "
DIAGNOSIS PROCEDURE FOR AMBIENT SENSOR" .
*3: AT C - 11 6 , "
DIAGNOSIS PROCEDURE FOR IN-VEHICLE SENSOR" .
*4: ATC-121, "
DIAGNOSIS PROCEDURE FOR INTAKE SENSOR" .
*5: AT C - 11 8 , "
DIAGNOSIS PROCEDURE FOR SUNLOAD SENSOR" .
*6: AT C - 8 4 , "
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR MOTOR PBR" .
>> INSPECTION END
Code No. Malfunctioning sensor and door motor (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)
SJIA1781E

ATC-68
TROUBLE DIAGNOSIS
Revision: 2007 April2007 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 (1.0°F) in the 18°C (60°F) to 32°C (90°F) 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.
RJIA4032E
RJIA4048E
RJIA4049E

TROUBLE DIAGNOSIS
ATC-77
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: 2007 April2007 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 LCUs, mode door motor LCUs, upper ventilator door motor LCU and intake door motor LCU.
The air mix door motors, mode door motors, upper ventilator 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 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.
*1ATC-37, "Discharge Air Flow"*2AT C - 6 5 , "Operational Check"*3ATC-121, "Intake Sensor Circuit"
*4ATC-57, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 2 to 6.*5AT C - 11 2 , "
Ambient Sensor Circuit"*6AT C - 11 5 , "In-vehicle Sensor Circuit"
*7ATC-118, "Sunload Sensor Circuit"*8AT C - 8 2 , "Air Mix Door Motor Cir-
cuit"
*9AT C - 5 7 , "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 13.
*10ATC-71, "
DIAGNOSIS PROCE-
DURE FOR LAN CIRCUIT"
*11ATC-139, "MODE DOOR MOTOR"*12AT C - 4 1 , "SYMPTOM TABLE"
RJIA4056E

TROUBLE DIAGNOSIS
ATC-79
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: 2007 April2007 M35/M45
Upper Ventilator Door Motor CircuitNJS000GP
SYMPTOM

Upper ventilator outlet does not change.

Upper ventilator door motor does not operate normally.
INSPECTION FLOW
*1ATC-57, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 2.*2AT C - 5 7 , "
FUNCTION CONFIRMA-
TION PROCEDURE", see No. 5.*3AT C - 5 7 , "
FUNCTION CONFIRMA-
TION PROCEDURE", see No. 6.
*4ATC-118, "
Sunload Sensor Circuit"*5AT C - 5 7 , "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 13.*6AT C - 7 1 , "
DIAGNOSIS PROCE-
DURE FOR LAN CIRCUIT"
*7ATC-141, "UPPER VENTILATOR
DOOR MOTOR"
*8AT C - 6 5 , "Operational Check"*9AT C - 4 1 , "SYMPTOM TABLE"
SJIA1775E