Nissan Sentra B18 (2020-2025) Service Manual: System

Nissan Sentra B18 (2020-2025) Service Manual / Cruise Control & Driver Assistance / Driver Assistance System :: Chassis Control / System Description / System

System Description

System Description

Chassis control to integrally control the driving system was adopted.
Chassis control module (with built in steering angle sensor) inputs the necessary information for control from CAN communication and each switch and integrally controls each system. Refer to the following table for systems controlled and input output signals.

Function		Reference page
Intelligent trace control function		System Description
Intelligent engine brake function		System Description
Active ride control function		System Description

SYSTEM DIAGRAM

INPUT SIGNAL AND OUTPUT SIGNAL

Major signal transmission between each unit via communication lines is shown in the following table.

Component parts	Signal description
ECM	Mainly transmits the following signals to chassis control module (with built in steering angle sensor) via CAN communication. Accelerator pedal position signal Engine speed signal Estimate drive torque signal Request drive torque signal Request drive torque status signal
ABS actuator and electric unit (control unit)	Mainly transmits the following signals to chassis control module (with built in steering angle sensor) via CAN communication. ABS operation signal Brake fluid pressure signal Decel G sensor signal Front LH wheel speed signal Front RH wheel speed signal Rear LH wheel speed signal Rear RH wheel speed signal Side G sensor signal TCS operation signal VDC accept permission signal VDC operation signal VDC OFF signal Nissan Sentra Vehicle speed signal Steering angle sensor signal Stop lamp switch signal Mainly receives the following signals from chassis control module (with built in steering angle sensor) via CAN communication. Intelligent trace control signal Active ride control signal
TCM	Mainly transmits the following signals to chassis control module (with built in steering angle sensor) via CAN communication. Current gear position signal CVT accept permission signal Mainly receives the following signals from chassis control module (with built in steering angle sensor) via CAN communication. Intelligent engine brake signal
BCM	Mainly transmits the following signals to chassis control module (with built in steering angle sensor) via CAN communication. Stop lamp switch signal
IPDM E/R	Mainly transmits the following signals to chassis control module (with built in steering angle sensor) via CAN communication. Ignition switch ON signal
Combination meter	Mainly receives the following signals from chassis control module (with built in steering angle sensor) via CAN communication. Meter display signal

Fail-Safe [chassis Control Module (with Built in Steering Angle Sensor)]

Fail-Safe [Chassis Control Module (With Built In Steering Angle Sensor)]

DTC	Fail-safe condition
C1B80-54	The following functions are suspended. Intelligent trace control function Intelligent engine brake function Active ride control function
C1B92-82	The following functions are suspended. Intelligent trace control function Active ride control function
C1B96-82	Normal control
C1BB4-44	The following functions are suspended. Intelligent trace control function Intelligent engine brake function Active ride control function
C1BB4-46
C1BB4-47
C1BB4-49
C1BB4-52
C1BB5-1C
U0076-00
U0078-00
U1A4A-87
U2140-87
U2141-87
U2148-83
U2148-87
U214E-87	Normal control
U214F-87
U215B-87
U2252-83

Intelligent Trace Control Function

System Description

System Description

The steering operation condition by the driver and the information from multiple sensors are computed by the chassis control module (with built in steering angle sensor), and a command is transmitted to the ABS actuator and electric unit (control unit).
The ABS actuator and electric unit (control unit) controls the brake based on the command from the chassis control module (with built in steering angle sensor).
When cornering, driver operation is reduced and Nissan Sentra vehicle behavior is smoothened.
When the VDC function is turned OFF, the intelligent trace control function is also completely turned OFF.
When a malfunction occurs in intelligent trace control function, the master warning lamp illuminates and the information display in the combination meter informs the driver.

Note:

Intelligent trace control function may not be effective in all driving environments (traction conditions, etc.).
When intelligent trace control function operates, vibration may be transmitted to the brake pedal, an operation sound may be heard, and a feeling of deceleration may be felt. These are not symptoms of malfunctions and indicate normal operating conditions.

OPERATION CHARACTERISTICS

This performs assistance when switching from deceleration (brake operation) to acceleration (accelerator operation) when driving on a curve. It operates the brake automatically to stabilize cornering and smoothens acceleration in the longitudinal and lateral directions.
- The brake is controlled according to the steering operation condition of the driver and the cornering condition of the Nissan Sentra vehicle.
For the purpose of improving responsiveness during excessive steering operation, such as emergency avoidance steering, etc., the brake is applied to the inside wheel of the steering direction and causes turning momentum to be generated.
- The brake is controlled according to the steering operation condition of the driver.

When driving on a curve, change of the steering operation angle is controlled, Nissan Sentra vehicle movement is smoothened and cornering with a stable feeling is realized simultaneously by controlling the brake on the inner wheel, according to accelerator operation.
- The brake is controlled according to the steering operation condition of the driver and the cornering condition of the Nissan Sentra vehicle.

When performing quick lane changes and other excessive steering operations, the brake is operated automatically, and erratic Nissan Sentra vehicle behavior due to steering operation is reduced.
- The brake is controlled according to the steering operation condition of the driver and the cornering condition of the Nissan Sentra vehicle.

SYSTEM DIAGRAM

INPUT SIGNAL AND OUTPUT SIGNAL

Major signal transmission between each unit via communication lines is shown in the following table.

Component parts	Signal description
ECM	Mainly transmits the following signals to chassis control module (with built in steering angle sensor) via CAN communication. Accelerator pedal position signal Engine speed signal Estimate drive torque signal Request drive torque signal Request drive torque status signal
ABS actuator and electric unit (control unit)	Mainly transmits the following signals to chassis control module (with built in steering angle sensor) via CAN communication. Brake fluid pressure signal Front LH wheel speed signal Front RH wheel speed signal Rear LH wheel speed signal Rear RH wheel speed signal Side G sensor signal TCS operation signal VDC accept permission signal VDC OFF signal VDC operation signal Steering angle sensor signal Mainly receives the following signals from chassis control module (with built in steering angle sensor) via CAN communication. Intelligent trace control signal
TCM	Mainly transmits the following signals to chassis control module (with built in steering angle sensor) via CAN communication. Current gear position signal
BCM	Mainly transmits the following signals to chassis control module (with built in steering angle sensor) via CAN communication. Stop lamp switch signal
Combination meter	Mainly receives the following signals from chassis control module (with built in steering angle sensor) via CAN communication. Meter display signal

Intelligent Engine Brake Function

System Description

System Description

The steering operation condition by the driver and the information from multiple sensors are computed by the chassis control module (with built in steering angle sensor), and a command is transmitted to the TCM.
Based on the command from the chassis control module (with built in steering angle sensor), TCM shifts the gear ratio of the transaxle to the low side and applies the engine brake.
When the VDC function is turned OFF, the intelligent engine brake function is also completely turned OFF.
When a malfunction occurs in intelligent engine brake function, the master warning lamp illuminates and the information display in the combination meter informs the driver.

Note:

Intelligent engine brake function may not be effective in all driving environments (traction conditions, etc.).
When intelligent engine brake function operates, the needle of the tachometer will rise up, you may hear an engine noise and sense slight deceleration. These are not symptoms of malfunctions and indicate normal operating conditions.

CORNERING CONTROL

For the purpose of reducing the operation of switching to depress the brake pedal during cornering, the operation information of the driver is computed by the chassis control module (with built in steering angle sensor) and a command is transmitted to TCM.
Based on the command from the chassis control module (with built in steering angle sensor) , TCM shifts the gear ratio of the transaxle to the low side and applies the engine brake.
- The transaxle is controlled according to the steering operation of the driver, as well as the accelerator pedal condition and cornering condition of the Nissan Sentra vehicle.

BRAKING CONTROL

For the purpose of improving the feeling of effectiveness of the brake when decelerating, the brake operation amount of the driver is computed by the chassis control module (with built in steering angle sensor) and a command is transmitted to TCM.
Based on the command from the chassis control module (with built in steering angle sensor), TCM shifts the gear ratio of the transaxle to the low side and applies the engine brake.
- The transaxle is controlled according to the brake condition.

SYSTEM DIAGRAM

INPUT SIGNAL AND OUTPUT SIGNAL

Major signal transmission between each unit via communication lines is shown in the following table.

Component parts	Signal description
ECM	Mainly transmits the following signals to chassis control module (with built in steering angle sensor) via CAN communication. Accelerator pedal position signal
ABS actuator and electric unit (control unit)	Mainly transmits the following signals to chassis control module (with built in steering angle sensor) via CAN communication. Brake fluid pressure signal Front LH wheel speed signal Front RH wheel speed signal Rear LH wheel speed signal Rear RH wheel speed signal Side G sensor signal VDC accept permission signal VDC operation signal Steering angle sensor signal ABS operation signal Stop lamp switch signal
TCM	Mainly transmits the following signals to chassis control module (with built in steering angle sensor) via CAN communication. CVT accept permission signal Mainly receives the following signals from chassis control module (with built in steering angle sensor) via CAN communication. Intelligent engine brake signal
BCM	Mainly transmits the following signals to chassis control module (with built in steering angle sensor) via CAN communication. Stop lamp switch signal
Combination meter	Mainly receives the following signals from chassis control module (with built in steering angle sensor) via CAN communication. Meter display signal

Active Ride Control Function

System Description

System Description

The driving condition and the information from multiple sensors are computed by the chassis control module (with built in steering angle sensor), and a command is transmitted to the ABS actuator and electric unit (control unit).
The ABS actuator and electric unit (control unit) control the brake based on the command from the chassis control module (with built in steering angle sensor).
When the VDC function is turned OFF, the active ride control function is also completely turned OFF.
When a malfunction occurs in active ride control function, the master warning lamp illuminates and the information display in the combination meter informs the driver.
Note:
- Active ride control function may not be effective in all driving environments (traction conditions, etc.).
- When active ride control function operates, vibration may be transmitted to the brake pedal, an operation sound may be heard, and a feeling of deceleration may be felt. These are not symptoms of malfunctions and indicate normal operating conditions.

OPERATION CHARACTERISTICS

When driving on an uneven road surface, mainly the rotation speed information of each wheel is computed by the chassis control module (with built in steering angle sensor) to estimate vertical G, and a command is transmitted to the ABS actuator and electric unit (control unit).
The ABS actuator and electric unit (control unit) control brake fluid pressure (brake force) according to the command from the chassis control module (with built in steering angle sensor).
By controlling the brake fluid pressure (brake force), behavior of the Nissan Sentra vehicle in the vertical direction decreases, and riding comfort is improved.
- Brake fluid pressure (brake force) is controlled according to driving conditions.

SYSTEM DIAGRAM

INPUT SIGNAL AND OUTPUT SIGNAL

Major signal transmission between each unit via communication lines is shown in the following table.

Component parts

Signal description

ECM

Mainly transmits the following signals to chassis control module (with built in steering angle sensor) via CAN communication.

Accelerator pedal position signal

ABS actuator and electric unit (control unit)

Mainly transmits the following signals to chassis control module (with built in steering angle sensor) via CAN communication.

ABS operation signal
Brake fluid pressure signal
Decel G sensor signal
Front LH wheel speed signal
Front RH wheel speed signal
Rear LH wheel speed signal
Rear RH wheel speed signal
TCS operation signal
VDC accept permission signal
VDC operation signal
Nissan Sentra Vehicle speed signal

Mainly receives the following signals from chassis control module (with built in steering angle sensor) via CAN communication.

Active ride control signal

Combination meter

Mainly receives the following signals from chassis control module (with built in steering angle sensor) via CAN communication.

Meter display signal

Information Display (combination Meter)

Chassis Control Display

Chassis Control Display

DESIGN/PURPOSE

The warning message is displayed on the information display when “Chassis Control” detected the system malfunction.

Warning Message

Design	Warning message
—	Chassis Control System Error See Owner’s Manual

SYNCHRONIZATION WITH MASTER WARNING LAMP

Applicable

SYNCHRONIZATION WITH WARNING CHIME

Not applicable

SYSTEM DIAGRAM

SIGNAL PATH

The chassis control module (with built in steering angle sensor) transmits the meter display signal to the combination meter via CAN communication.
The combination meter shows the chassis control warning on the information display, according to the signal.

WARNING MESSAGE DISPLAY CONDITION

When all of the following conditions are satisfied.

Ignition switch ON
Chassis control system malfunction is detected. Refer to DTC Index.

Component Parts

Chassis Control System Component Parts Location Component Parts Location A. View with steering wheel ...

Diagnosis System [chassis Control Module (with Built in Steering Angle Sensor)]

Consult Function CONSULT Function APPLICATION ITEMS CONSULT can display each diagnostic item using the diagnostic test modes as follows. ...

Other materials:

Removal and Installation
Removal and Installation REMOVAL Discharge the refrigerant. Refer to Recycle Refrigerant. Remove the front bumper. Refer to Removal and Installation. Remove air guides. Refer to Exploded View. Remove bolt (A) and disconnect high-pressure flexible hose from conden ...

Precautions
Precautions for Supplemental Restraint System (srs) "air Bag" and "seat Belt Pre-Tensioner" Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER" The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along w ...

Dtc Diagnosis Procedure
DTC Diagnosis Procedure CHECK FUSE Ignition switch OFF. Check that the following fuse is not blown (open): ...