Transfer: Overview Infiniti M45 III

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 the shift occasionally changes to direct 4-wheel driving conditions automatically. This is not malfunction.

Scheme 1

Scheme 2

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.

COMPONENTS FUNCTION DESCRIPTION

COMPONENTS FUNCTION DESCRIPTION CHART

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 ".

Fail-Safe Function

1. If any malfunction occurs in AWD electrical system, and control unit detects the malfunction, AWD warning lamp on combination meter turns ON to indicate system malfunction.
2. When AWD warning lamp is ON, vehicle changes to rear-wheel drive or shifting driving force-AWD (Front wheels still have some driving torque).

Scheme 3

1. To perform trouble diagnosis, it is the most important to have understanding about vehicle systems (control and mechanism) thoroughly.
2. It is also important to clarify customer complaints before inspection. First of all, reproduce symptoms, and understand them fully. Ask customer about his/her complaints carefully. In some cases, it will be necessary to check symptoms by driving vehicle with customer. CAUTION: Customers are not professional. It is dangerous to make an easy guess like "maybe the customer means that...," or "maybe the customer mentions this symptom".
3. It is essential to check symptoms right from the beginning in order to repair malfunctions completely. For intermittent malfunctions, reproduce symptoms based on interview with customer and past examples. Do not perform inspection on ad hoc basis. Most intermittent malfunctions are caused by poor contacts. In this case, it will be effective to shake suspected harness or connector by hand. When repairing without any symptom diagnosis, you cannot judge if malfunctions have actually been eliminated.
4. After completing diagnosis, always erase diagnostic memory. Refer to , " «HOW TO ERASE SELF-DIAGNOSTIC RESULTS»(ref-239130-S11352840472006072700000) ".
5. For intermittent malfunctions, move harness or harness connector by hand. Then check for poor contact or reproduced open circuit.

Scheme 4

Scheme 5

Scheme 6

Operation Procedure

1. Perform "CONSULT-II Start Procedure". Refer to " «CONSULT-II START PROCEDURE»(ref-239095-S42554850072006072700000) ".
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.

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.