Transfer Case (Except Hybrid): Overview Infiniti QX60 I

DESCRIPTION

1. AWD controls distribution of drive power between front-wheel drive (100:0) and 4-wheel drive (50:50) conditions according to signals from sensors.
2. By receiving the steering angle sensor signal, yaw rate sensor signal, side G sensor signal and decel G sensor signal, vehicle with VDC corrects a torque distribution for front and rear wheels according to a driving operation and a behavior of the vehicle during cornering and improves drivability and safety on a slippery road surface.
3. Electronic control allows optimal distribution of torque to front/rear wheels to match road conditions.
4. AWD mode makes possible stable driving possible with no wheel spin, on snowy roads or other slippery surfaces.
5. On roads which do not require 4-wheel drive, it contributes to improved fuel economy by driving in conditions close to front-wheel drive.
6. Sensor inputs determine the vehicle's turning condition, and tight cornering/braking are controlled by distributing optimum torque to rear wheels. NOTE: Light tight-corner braking symptom may occur depending on driving condition. This is not malfunction.

Scheme 1

ECU IDENTIFICATION

AWD control unit part number can be read.

1. In general, customers have their own criteria for a problem. Therefore, it is important to understand the symptom and status well enough by asking the customer about his/her concerns carefully. To systemize all the information for the diagnosis, prepare the interview sheet referring to the interview points.
2. In some cases, multiple conditions that appear simultaneously may cause a DTC to be detected.

Scheme 2

When replacing AWD control unit, unit characteristics writing is required.

When replacing AWD control unit, rear final drive assembly and/or electric controlled coupling, unit characteristics of electric controlled coupling writing is required.

Scheme 3

1. UNIT CHARACTERISTICS WRITING With CONSULT Confirm the unit characteristics (A) of electric controlled coupling. NOTE: Unit characteristics is 12-digit alphanumeric. Turn the ignition switch OFF to ON. Select "UNIT CHARACTERISTICS WRITE" in "WORK SUPPORT" for "ALL MODE AWD/4WD". Input unit characteristics. Select "Start". Check that "UNIT CHARACTERISTICS WRITE COMPLETED" is displayed. : WORK END

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 communicate data but selectively reads required data only.

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 communicate data but selectively reads required data only.

AWD warning icon/display (AWD Error: See Owner's Manual) is displayed on information display after the engine started.

Heavy tight-corner braking symptom occurs when the vehicle is driven and the steering wheel is turned fully to either side after the engine is started.

Note. Light tight-corner braking symptom may occur depending on driving conditions. This is not malfunction.

Vehicle does not enter 4-wheel drive mode even though AWD warning icon/display is not displayed.

While driving, AWD warning icon/display (AWD High Temp. Stop vehicle) is displayed on information display and it turns OFF after 1 minute.

1. This symptom protects drivetrain parts when a heavy load is applied to the electric controlled coupling and multiple disc clutch temperature increases. Also, optional distribution of torque sometimes becomes rigid before icon/display is displayed. Both cases are not malfunction. Refer to " «PROTECTION FUNCTION»(ref-657675-S08427297482014092100000) ".
2. When this symptom occurs, stop vehicle and allow it to idle for some times. Displays will stop and system will be restored.

While driving, AWD warning icon/display (Tire Size Incorrect: See Owner's Manual) is displayed on information display.