Transfer: Overview Infiniti FX45 I

Description

1. Electronic control allows optimal distribution of torque to front/rear wheels to match road conditions.
2. Makes possible stable driving, with no wheel spin, on snowy roads or other slippery surfaces.
3. On roads which do not require AWD, it contributes to improved fuel economy by driving in conditions close to rear-wheel drive.
4. Sensor inputs determine the vehicle's turning condition, and in response tight cornering/braking are controlled by distributing optimum torque to front wheels.

Note. When driving, if there is a large difference between front and rear wheel speed which continues for a long time, fluid temperature of drive system parts becomes too high and AWD warning lamp flashes rapidly. (When AWD warning lamp flashes, vehicle changes to rear-wheel drive conditions.) Also, optional distribution of torque sometimes becomes rigid before lamp flashes rapidly, but it is not malfunction. If AWD warning lamp is flashing rapidly, stop vehicle and allow it to idle for some time. Flashing will stop and AWD system will be restored. When driving, AWD warning lamp may flash slowly if there is a significant difference in diameter of the tires. At this time, vehicle performance is not fully available and cautious driving is required. (Continues until engine is turned OFF.) If the warning lamp flashes slowly during driving but remains OFF after engine is restarted, the system is normal. If it again flashes slowly after driving for some time, vehicle must be inspected. When the difference of revolution speed between the front and rear wheel with AUTO mode the shift occasionally changes to direct 4-wheel driving conditions automatically. This is not malfunction.

Scheme 1

1. AWD control unit supplies command current to electric controlled coupling (AWD solenoid).
2. Control clutch is engaged by electromagnet and torque is detected in control clutch.
3. The cam operates in response to control clutch torque and applies pressure to main clutch.
4. Main clutch transmits torque to front wheels according to pressing power. Transmission torque to front wheels is determined according to command current.

Scheme 2

Scheme 3

1. Controls distribution of drive power between rear-wheel drive (0:100) and AWD (50:50) conditions according to signals from sensors.
2. Self-diagnosis can be done with CONSULT-II.

System Description

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only.

For details, refer to CAN COMMUNICATION UNIT .

Operation procedure

1. Perform "CONSULT-II SETTING PROCEDURE". Refer to «CONSULT-II SETTING PROCEDURE»(ref-173650-S29480390132005032100000) .
2. Touch "DATA MONITOR".
3. Select from "SELECT MONITOR ITEM", screen of data monitor mode is displayed. NOTE: When malfunction is detected, CONSULT-II performs REAL-TIME DIAGNOSIS. Also, any malfunction detected while in this mode will be displayed at real time.

Scheme 4

Scheme 5

Use this mode to determine and identify the details of a malfunction based on self-diagnostic results or data monitor. AWD control unit gives drive signal to actuator with receiving command from CONSULT-II to check operation of actuator.

Scheme 6