2007 INFINITI M35 ECU

ASSEMBLY
AT-365
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Revision: 2007 April2007 M35/M45
d. Install O-ring to A/T assembly harness connector.
CAUTION:

Do not reuse O-ring.

Apply ATF to O-ring.
e. Install A/T fluid temperature sensor 2 to bracket.
f. Install A/T fluid temperature sensor 2 (with bracket) in control
valve with TCM. Tighten A/T fluid temperature sensor 2 bolt to
the specified torque. Refer to AT- 2 8 1 , "
Components" .
CAUTION:
Adjust bolt hole of bracket to bolt hole of control valve.
g. Install control valve with TCM in transmission case.
CAUTION:

Make sure that turbine revolution sensor securely installs
turbine revolution sensor hole.

Hang down revolution sensor harness toward outside so
as not to disturb installation of control valve with TCM.

Adjust A/T assembly harness connector of control valve
with TCM to terminal hole of transmission case.

Assemble it so that manual valve cutout is engaged with
manual plate projection.
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SCIA5035E

AT-366
ASSEMBLY
Revision: 2007 April2007 M35/M45
h. Install bolts A, B and C to control valve with TCM.
i. Tighten bolt 1, 2 and 3 temporarily to prevent dislocation. After
that tighten them in order (1 → 2 → 3), and then tighten other
bolts. Tighten control valve bolts to the TCM with specified
torque. Refer to AT- 2 8 1 , "
Components" .
10. Connect A/T fluid temperature sensor 2 connector.
11. Securely fasten terminal cord assembly and A/T fluid tempera-
ture sensor 2 harness with terminal clips.
12. Connect revolution sensor connector.
Bolt symbol Length mm (in) Number of bolts
A 42 (1.65) 5
B 55 (2.17) 6
C 40 (1.57) 1
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ASSEMBLY
AT-367
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Revision: 2007 April2007 M35/M45
13. Securely fasten revolution sensor harness with terminal clip.
14. Pull down A/T assembly harness connector.
CAUTION:
Be careful not to damage connector.
15. Install snap ring to A/T assembly harness connector.
16. Install magnets in oil pan.
17. Install oil pan, oil pan gasket and clips (VQ35DE models) or oil pan, oil pan gasket, brackets and clips
(VK45DE models) according to the following procedures.
a. VQ35DE models
i. Install oil pan gasket to oil pan.
CAUTION:

Do not reuse oil pan gasket.

Install it in the direction to align hole positions.

Complete remove all moisture, oil and old gasket, etc. from oil pan gasket mounting surface.
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PRECAUTIONS
ATC-9
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Revision: 2007 April2007 M35/M45
2. Slide disconnector in axial direction of piping, and stretch garter spring with tapered point of disconnector.
3. Slide disconnector farther so that inside diameter of garter spring becomes larger than outside diameter of
female-side piping flare. Then male-side piping can be disconnected.
INSTALLATION
1. Clean piping connection points, and insert male-side piping into female-side piping.
2. Push inserted male-side piping harder so that female-side piping flare stretches garter spring.
3. If inside diameter of garter spring becomes larger than outside diameter of female-side piping flare, garter
spring seats on flare. Then, it fits in between male-side piping cage and female-side piping flare to anchor
piping connection point.
NOTE:
When garter spring seats on flare, and fits in between male-side piping cage and female-side piping flare,
it clicks.
CAUTION:

Female-side piping connection is thin and easy to deform. Slowly insert the male-side piping
straight in axial direction.

Insert piping securely until a click is heard.

After piping connection is completed, pull male-side piping by hand to make sure that connec-
tion does not come loose.
NOTE:
One-touch joint connection is used in points below.

Low-pressure flexible hose to low-pressure pipe 1 (O-ring size: 16)

High-pressure flexible hose to condenser (O-ring size: 12)

High-pressure pipe 1 to high-pressure pipe 2 (O-ring size: 8)

High-pressure pipe 1 to condenser (O-ring size: 8)
SJIA0107E

REFRIGERATION SYSTEM
ATC-23
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Revision: 2007 April2007 M35/M45
Operation
1. Control Valve
–By changing high-pressure valve lift amount, built-in electronic control valve executes the following:
 Controls high-pressure valve discharge amount.
 Changes crankcase pressure in compressor.
 Changes angle of swash plate.
–Amount of high-pressure valve lift is determined by factors below.
 Low-pressure applied to diaphragm
 Spring load of set spring
 Balance of magnetic force generated in magnet coil
–Electronic control valve (ECV) magnet coil receives electric signal (duty control) from unified meter and A/
C amp. Then, magnetic force generated by electric current is changed to control high-pressure valve lift
amount.
2. Maximum Cooling
High-pressure valve is closed by magnetic force generated by electric signal sent from unified meter and
A/C amp. At this time, cylinder moves full stroke due to pressure balance between inside crankcase (Pc)
and suction line (Ps).
Under this condition, the swash plate is set to the maximum stroke position.
3. Capacity Control
When no electric signal is sent from unified meter and A/C amp. (current: OFF), high-pressure valve is
opened by spring force.
Since suction pressure is low, it makes the suction port close and the discharge port open. Thus, crank-
case pressure becomes high as high-pressure enters the crankcase.
–The force acts around the link near the swash plate, and is generated by the pressure difference before
and behind the piston.
–The thrust flange and link are located where the piston generates the highest pressure. Piston pressure is
between suction pressure Ps and discharge pressure Pd, which is close to suction pressure Ps. If crank-
case pressure Pc rises due to capacity control, the force around the link makes the swash plate angle
decrease and also the piston stroke decrease. In other words, crankcase pressure increase triggers pres-
SJIA0547E

ATC-30
AIR CONDITIONER CONTROL
Revision: 2007 April2007 M35/M45
OPERATION
The unified meter and A/C amp. receives data from each of the sensors. The unified meter and A/C amp.
sends mode door, air mix door, upper ventilator door and intake door opening angle data to the mode door
motor LCU, air mix door motor LCU, upper ventilator door motor LCU and intake door motor LCU.
The mode door motor, air mix 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 is 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 is returned to the unified meter and A/C amp.
TRANSMISSION DATA AND TRANSMISSION ORDER
Unified meter and A/C amp. data is transmitted consecutively to each of the door motors following the form
shown in figure below.
Start:
Initial compulsory signal is sent to each of the door motors.
Address:
Data sent from the unified meter and A/C amp. are selected according to data-based decisions made by the
mode door motor, air mix door motor, upper ventilator door motor and intake door motor.
If the addresses are identical, the opening angle data and error check signals are received by the door motor
LCUs. The LCUs then make the appropriate error decision. If the opening angle data have no error, door con-
trol begins.
If an error exists, the received data are rejected and corrected data received. Finally, door control is based
upon the corrected opening angle data.
Opening angle:
Data that shows the indicated door opening angle of each door motor.
Error Check:
In this procedure, transmitted and received data is checked for errors. Error data are then compiled. The error
check prevents corrupted data from being used by the mode door motor, the air mix door motor, the upper
ventilator door motor and the intake door motor. Error data can be related to the following symptoms.

Malfunction of electrical frequency

Poor electrical connections

Signal leakage from transmission lines

Signal level fluctuation
RJIA4018E

ATC-128
INTAKE SENSOR
Revision: 2007 April2007 M35/M45
INTAKE SENSORPFP:27723
Removal and InstallationNJS000H9
REMOVAL
1. Remove low-pressure pipe 1 and high-pressure pipe 2. Refer to ATC-161, "Removal and Installation of
Low-pressure Pipe 1 and High-pressure Pipe 2" .
CAUTION:
Cap or wrap the joint of evaporator, low-pressure flexible hose and high-pressure pipe 1 with suit-
able material such as vinyl tape to avoid the entry of air.
2. Slide evaporator to passenger side, and then remove intake
sensor.
INSTALLATION
Installation is basically the reverse order of removal.
CAUTION:

Replace O-rings of low-pressure flexible hose, low-pressure pipe 1 and high-pressure pipe 1, 2
with new ones, and then apply compressor oil to it when installing it.

Mark the mounting position of intake sensor bracket prior to removal so that the reinstalled sen-
sor can be located in the same position.

Female-side piping connection is thin and easy to deform. Slowly insert the male-side piping
straight in axial direction.

Insert piping securely until a click is heard.

After piping connection is completed, pull male-side piping by hand to make sure that connection
does not come loose.

When recharging refrigerant, check for leaks.
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BLOWER UNIT
ATC-129
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Revision: 2007 April2007 M35/M45
BLOWER UNITPFP:27200
Removal and InstallationNJS000IA
REMOVAL
1. Remove instrument passenger lower cover and glove box cover. Refer to IP-10, "INSTRUMENT PANEL
ASSEMBLY" .
2. Remove BCM. Refer to BCS-15, "
Removal and Installation of BCM" .
3. Remove mounting nuts, and then remove ECM with bracket
attached.
4. Disconnect intake door motor connector and blower fan motor
connector.
5. Remove mounting bolt and screw from blower unit.
CAUTION:
Move blower unit rightward, and remove locating pin (1
part) and joint. Then remove blower unit downward.
6. Remove blower unit.
INSTALLATION
Installation is basically the reverse order of removal.
CAUTION:
Make sure locating pin (1 part) and joint are securely inserted.
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