Nissan Sentra manuals

Nissan Sentra Service Manual: System

VDC/TCS/ABS

VDC/TCS/ABS : System Diagram

VDC/TCS/ABS : System Description


VDC/TCS/ABS : System Description

INPUT SIGNAL AND OUTPUT SIGNAL

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

Component

Signal description

Steering angle sensor Transmits the steering angle sensor signal to ABS actuator and electric unit (control unit) via CAN communication.
ECM Transmits the following signals to ABS actuator and electric unit (control unit) via CAN communication.
  • Accelerator pedal position signal
  • Engine speed signal
  • Target throttle position signal
TCM Transmits the current gear position signal to ABS actuator and electric unit (control unit) via CAN communication.
Combination meter Transmits the following signals to ABS actuator and electric unit (control unit) via CAN communication.
  • Brake fluid level switch signal
  • Parking brake switch signal

Receives the following signals from ABS actuator and electric unit (control unit) via CAN communication.

  • ABS warning lamp signal
  • Brake warning lamp signal
  • VDC OFF indicator lamp signal
  • SLIP indicator lamp signal

VALVE OPERATION (VDC AND TCS FUNCTIONS)

The control unit built in the ABS actuator and electric unit (control unit) controls fluid pressure of the brake calipers by operating each valve.

VDC and TCS Functions are Operating (Pressure Increases)


Name

Not activated

Pressure increases

Cut valve 1 Power supply is not supplied (open) Power supply is supplied (close)
Cut valve 2 Power supply is not supplied (open) Power supply is supplied (close)
Suction valve 1 Power supply is not supplied (close) Power supply is supplied (open)
Suction valve 2 Power supply is not supplied (close) Power supply is supplied (open)
ABS IN valve Power supply is not supplied (open) Power supply is not supplied (open)
ABS OUT valve Power supply is not supplied (close) Power supply is not supplied (close)
Each brake caliper and each wheel cylinder (fluid pressure) — Pressure increases

Front RH brake caliper

Front LH brake caliper

Rear RH brake caliper/wheel cylinder

Rear LH brake caliper/wheel cylinder

VDC and TCS Functions Start Operating (Pressure Holds)


Front RH brake caliper


Front RH brake caliper

Front LH brake caliper

Rear RH brake caliper/wheel cylinder

Rear LH brake caliper/wheel cylinder

VDC and TCS Functions Operating (Pressure Decreases)


Front RH brake caliper


Front RH brake caliper

Front LH brake caliper

Rear RH brake caliper/wheel cylinder

Rear LH brake caliper/wheel cylinder

Component Parts and Function

Component

Function

Pump Returns the brake fluid reserved in reservoir to master cylinder by reducing pressure.
Motor Activates the pump according to signals from ABS actuator and electric unit (control unit).
Cut valve 1 Cut valve 2 Shuts off the ordinary brake line from master cylinder.
Suction valve 1 Suction valve 2 Supplies the brake fluid from master cylinder to the pump.
ABS IN valve Switches the fluid pressure line to increase or hold according to signals from control unit.
ABS OUT valve Switches the fluid pressure line to increase, hold or decrease according to signals from control unit.
Return check valve Returns the brake fluid from brake caliper and wheel cylinder to master cylinder by bypassing orifice of each valve when brake is released.
Reservoir Temporarily reserves the brake fluid drained from brake caliper, so that pressure efficiently decreases when decreasing pressure of brake caliper and wheel cylinder
Pressure sensor Detects the brake fluid pressure and transmits signal to ABS actuator and electric unit (control unit).

VALVE OPERATION (ABS AND EBD FUNCTIONS)

The control unit built into the ABS actuator and electric unit (control unit) controls fluid pressure of the brake calipers by operating each valve.

Brake Pedal Applied or ABS Function Operating (Pressure Increases)


Name

Not activated

During pressure increases

Cut valve 1 Power supply is not supplied (open) Power supply is not supplied (open)
Cut valve 2 Power supply is not supplied (open) Power supply is not supplied (open)
Suction valve 1 Power supply is not supplied (close) Power supply is not supplied (close)
Suction valve 2 Power supply is not supplied (close) Power supply is not supplied (close)
ABS IN valve Power supply is not supplied (open) Power supply is supplied (close)
ABS OUT valve Power supply is not supplied (close) Power supply is not supplied (close)
Each brake caliper and each wheel cylinder (fluid pressure)

—

Pressure increases

Front RH brake caliper

Front LH brake caliper

Rear RH brake caliper/wheel cylinder

Rear LH brake caliper/wheel cylinder

ABS Function Starts Operating (Pressure Holds)


Name

Not activated

During pressure holds

Cut valve 1 Power supply is not supplied (open) Power supply is not supplied (open)
Cut valve 2 Power supply is not supplied (open) Power supply is not supplied (open)
Suction valve 1 Power supply is not supplied (close) Power supply is not supplied (close)
Suction valve 2 Power supply is not supplied (close) Power supply is not supplied (close)
ABS IN valve Power supply is not supplied (open) Power supply is supplied (close)
ABS OUT valve Power supply is not supplied (close) Power supply is not supplied (close)
Each brake caliper and each wheel cylinder (fluid pressure) — Pressure holds

Front RH brake caliper

Front LH brake caliper

Rear RH brake caliper/wheel cylinder

Rear LH brake caliper/wheel cylinder

ABS Function Operating (Pressure Decreases)


Name

Not activated

During pressure decreases

Cut valve 1 Power supply is not supplied (open) Power supply is not supplied (open)
Cut valve 2 Power supply is not supplied (open) Power supply is not supplied (open)
Suction valve 1 Power supply is not supplied (close) Power supply is not supplied (close)
Suction valve 2 Power supply is not supplied (close) Power supply is not supplied (close)
ABS IN valve Power supply is not supplied (open) Power supply is supplied (close)
ABS OUT valve Power supply is not supplied (close) Power supply is supplied (open)
Each brake caliper and each wheel cylinder (fluid pressure)

—

Pressure decreases

Front RH brake caliper

Front LH brake caliper

Rear RH brake caliper/wheel cylinder

Rear LH brake caliper/wheel cylinder

ABS Function Operating (Pressure Increases)


Name

Not activated

During pressure increases

Cut valve 1 Power supply is not supplied (open) Power supply is not supplied (open)
Cut valve 2 Power supply is not supplied (open) Power supply is not supplied (open)
Suction valve 1 Power supply is not supplied (close) Power supply is not supplied (close)
Suction valve 2 Power supply is not supplied (close) Power supply is not supplied (close)
ABS IN valve Power supply is not supplied (open) Power supply is not supplied (open)
ABS OUT valve Power supply is not supplied (close) Power supply is not supplied (close)
Each brake caliper and each wheel cylinder (fluid pressure)

—

Pressure increases

Front RH brake caliper

Front LH brake caliper

Rear RH brake caliper/wheel cylinder

Brake Release


Name

Not activated

During brake release

Cut valve 1 Power supply is not supplied (open) Power supply is not supplied (open)
Cut valve 2 Power supply is not supplied (open) Power supply is not supplied (open)
Suction valve 1 Power supply is not supplied (close) Power supply is not supplied (close)
Suction valve 2 Power supply is not supplied (close) Power supply is not supplied (close)
ABS IN valve Power supply is not supplied (open) Power supply is not supplied (open)
ABS OUT valve Power supply is not supplied (close) Power supply is not supplied (close)
Each brake caliper and each wheel cylinder (fluid pressure)

—

Pressure decreases

Front RH brake caliper

Front LH brake caliper

Rear RH brake caliper/wheel cylinder

Rear LH brake caliper/wheel cylinder

Component Parts and Function

Component

Function

Pump Returns the brake fluid reserved in reservoir to master cylinder by reducing pressure.
Motor Activates the pump according to signals from ABS actuator and electric unit (control unit).
Cut valve 1 Cut valve 2 Shuts off the ordinary brake line from master cylinder.
Suction valve 1 Suction valve 2 Supplies the brake fluid from master cylinder to the pump.
ABS IN valve Switches the fluid pressure line to increase or hold according to signals from control unit.
ABS OUT valve Switches the fluid pressure line to increase, hold or decrease according to signals from control unit.
Return check valve Returns the brake fluid from brake caliper and wheel cylinder to master cylinder by bypassing orifice of each valve when brake is released.
Reservoir Temporarily reserves the brake fluid drained from brake caliper, so that pressure efficiently decreases when decreasing pressure of brake caliper and wheel cylinder.
Pressure sensor Detects the brake fluid pressure and transmits signal to ABS actuator and electric unit (control unit).

Conditions for indicator lamp illumination

Conditions for warning lamp illumination


Conditions for warning lamp illumination

Turns ON when ignition switch turns ON and turns OFF when the system is normal, for bulb check purposes.


VDC/TCS/ABS : VDC Function


VDC/TCS/ABS : VDC Function

SYSTEM DIAGRAM

SYSTEM DESCRIPTION


SYSTEM DESCRIPTION


INPUT SIGNAL AND OUTPUT SIGNAL

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

Component

Signal description

ECM Transmits the following signals to ABS actuator and electric unit (control unit) via CAN communication.
  • Acceleration pedal position signal
  • Engine speed signal
  • Target throttle position signal
TCM Transmits the current gear position signal to ABS actuator and electric unit (control unit) via CAN communication.
Steering angle sensor Transmits the steering angle sensor signal to ABS actuator and electric unit (control unit) via CAN communication.
Combination meter Transmits the following signals to ABS actuator and electric unit (control unit) via CAN communication.
  • Brake fluid level switch signal
  • parking brake switch signal

Receives the following signals from ABS actuator and electric unit (control unit) via CAN communication.

  • VDC OFF indicator lamp signal
  • SLIP indicator lamp signal

OPERATION CHARACTERISTICS

VDC Function That Prevents Oversteer Tendency


VDC Function That Prevents Understeer Tendency


VDC Function That Prevents Understeer Tendency


VDC/TCS/ABS : TCS Function


VDC/TCS/ABS : TCS Function

SYSTEM DIAGRAM

SYSTEM DESCRIPTION


SYSTEM DESCRIPTION

INPUT SIGNAL AND OUTPUT SIGNAL


INPUT SIGNAL AND OUTPUT SIGNAL

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

Component

Signal description

ECM Transmits the following signals to ABS actuator and electric unit (control unit) via CAN communication.
  • Accelerator pedal position signal
  • Engine speed signal
  • Target throttle position signal
TCM Transmits the current gear position signal to ABS actuator and electric unit (control unit) via CAN communication.
Steering angle sensor Transmits the steering angle sensor signal to ABS actuator and electric unit (control unit) via CAN communication.
Combination meter Transmits the following signals to ABS actuator and electric unit (control unit) via CAN communication.
  • Brake fluid level switch signal
  • Parking brake switch signal

Receives the following signals from ABS actuator and electric unit (control unit) via CAN communication.

  • VDC OFF indicator lamp signal
  • SLIP indicator lamp signal

VDC/TCS/ABS : ABS Function

SYSTEM DIAGRAM


INPUT SIGNAL AND OUTPUT SIGNAL


INPUT SIGNAL AND OUTPUT SIGNAL

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

Component

Signal description

Combination meter Receives the following signals from ABS actuator and electric unit (control unit) via CAN communication.
  • VDC warning lamp signal
  • ABS warning lamp signal

VDC/TCS/ABS : EBD Function

SYSTEM DIAGRAM



INPUT SIGNAL AND OUTPUT SIGNAL


INPUT SIGNAL AND OUTPUT SIGNAL

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

Component

Signal description

Combination meter Receives the following signals from ABS actuator and electric unit (control unit) via CAN communication.
  • ABS warning lamp signal
  • Brake warning lamp signal
  • SLIP indicator lamp signal

VDC/TCS/ABS : Fail-safe

VDC AND TCS FUNCTIONS

VDC warning lamp in combination meter turns ON when a malfunction occurs in system [ABS actuator and electric unit (control unit)]. The control is suspended for VDC and TCS functions. However, ABS and EBD functions operate normally.

ABS FUNCTION

ABS warning lamp and SLIP indicator lamp in combination meter turn ON when a malfunction occurs in system [ABS actuator and electric unit (control unit)]. The control is suspended for VDC, TCS and ABS functions.

However, EBD functions operate normally.

EBD FUNCTION

ABS warning lamp, brake warning lamp and SLIP indicator lamp in combination meter turn ON when a malfunction occurs in system [ABS actuator and electric unit (control unit)]. The control is suspended for VDC, TCS, ABS and EBD functions

DTC

Malfunction detected condition

Fail-safe condition

C1101 When an open circuit is detected in rear RH wheel sensor circuit. The following functions are suspended:
  • VDC
  • ABS
  • EBD (only when both rear wheels are malfunctioning)
C1102 When an open circuit is detected in rear LH wheel sensor circuit.
C1103 When an open circuit is detected in front RH wheel sensor circuit.
C1104 When an open circuit is detected in front LH wheel sensor circuit.
C1105
  • When a short circuit is detected in rear RH wheel sensor circuit.
  • When power supply voltage of rear RH wheel sensor is in following state.
  • Rear RH wheel sensor power supply voltage: 7.2 V ≥ Rear RH wheel sensor power supply voltage
  • When distance between rear RH wheel sensor and rear RH wheel sensor rotor is large.
  • When installation of rear RH wheel sensor or rear RH wheel sensor rotor is not normal.
C1106
  • When a short circuit is detected in rear LH wheel sensor circuit.
  • When power supply voltage of rear LH wheel sensor is in following state.
  • Rear LH wheel sensor power supply voltage: 7.2 V ≥ Rear LH wheel sensor power supply voltage
  • When distance between rear LH wheel sensor and rear LH wheel sensor rotor is large.
  • When installation of rear LH wheel sensor or rear LH wheel sensor rotor is not normal.
C1107
  • When a short circuit is detected in front RH wheel sensor circuit.
  • When power supply voltage of front RH wheel sensor is in following state.
  • Front RH wheel sensor power supply voltage: 7.2 V ≥ Front RH wheel sensor power supply voltage
  • When distance between front RH wheel sensor and front RH wheel sensor rotor is large.
  • When installation of front RH wheel sensor or front RH wheel sensor rotor is not normal.
C1108
  • When a short circuit is detected in front LH wheel sensor circuit.
  • When power supply voltage of front LH wheel sensor is in following state.
  • Front LH wheel sensor power supply voltage: 7.2 V ≥ Front LH wheel sensor power supply voltage
  • When distance between front LH wheel sensor and front LH wheel sensor rotor is large.
  • When installation of front LH wheel sensor or front LH wheel sensor rotor is not normal.
C1109
  • When ignition power supply voltage is in following state.
  • Ignition power supply voltage: 10 V ≥ Ignition power supply voltage.
  • Ignition power supply voltage: 16 V ≤ Ignition power supply voltage.
The following functions are suspended:
  • VDC
  • TCS
  • ABS
  • EBD
C1110 When there is an internal malfunction in the ABS actuator and electric unit (control unit).
C1111 When a malfunction is detected in motor or motor relay. The following functions are suspended:
  • VDC
  • TCS
  • ABS
C1113 When a malfunction is detected in longitudinal G signal. The following functions are suspended:
  • VDC
  • TCS
C1115 When difference in wheel speed between any wheel and others is detected when the vehicle is driven, because of installation of tires other than specified. The following functions are suspended:
  • VDC
  • TCS
  • ABS
  • EBD
DTC Malfunction detected condition Fail-safe condition
C1116 When stop lamp switch signal is not input when brake pedal operates. The following functions are suspended:
  • VDC
  • TCS
C1120 When a malfunction is detected in front LH ABS IN valve. The following functions are suspended:
  • VDC
  • TCS
  • ABS
  • EBD
C1121 When a malfunction is detected in front LH ABS OUT valve.
C1122 When a malfunction is detected in front RH ABS IN valve.
C1123 When a malfunction is detected in front RH ABS OUT valve.
C1124 When a malfunction is detected in rear LH ABS IN valve.
C1125 When a malfunction is detected in rear LH ABS OUT valve.
C1126 When a malfunction is detected in rear RH ABS IN valve.
C1127 When a malfunction is detected in rear RH ABS OUT valve.
C1130 When a malfunction is detected in ECM system. The following functions are suspended:
  • VDC
  • TCS
C1140 When a malfunction is detected in actuator relay. The following functions are suspended:
  • VDC
  • TCS
  • ABS
  • EBD
C1142 When a malfunction is detected in VDC pressure sensor. The following functions are suspended:
  • VDC
  • TCS
C1143 When a malfunction is detected in steering angle sensor.
C1144 When neutral position adjustment of steering angle sensor is not complete.
C1145 When a malfunction is detected in yaw rate signal, or signal line of yaw rate/side/ decel G sensor is open or shorted.
C1146 When a malfunction is detected in side G signal, or signal line of yaw rate/side/decel G sensor is open or shorted.
C1155 When brake fluid level low signal is detected. The following functions are suspended:
  • VDC
  • TCS
C1164 When a malfunction is detected in cut valve 1. The following functions are suspended:
  • VDC
  • TCS
  • ABS
  • EBD
C1165 When a malfunction is detected in cut valve 2.
C1166 When a malfunction is detected in suction valve 1.
C1167 When a malfunction is detected in suction valve 2.
C1170 When the information in ABS actuator and electric unit (control unit) is not the same. The following functions are suspended:
  • VDC
  • TCS
  • ABS
U1000 When CAN communication signal is not continuously transmitted or received for 2 seconds or more. The following functions are suspended:
  • VDC
  • TCS
U1002 When ABS actuator and electric unit (control unit) is not transmitting or receiving CAN communication signal for 2 seconds or less.
U1010 When detecting error during the initial diagnosis of CAN controller of ABS actuator and electric unit (control unit).
Component parts
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Diagnosis system [abs actuator and electric unit (control unit)]
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Other materials:

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Control buttons
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