Nissan Versa

 Sedan Service Manual

Brakes » Brake control system (BRC)
Unexpected pedal reaction

Diagnosis Procedure

1.CHECK BRAKE PEDAL STROKE

Check brake pedal stroke. Refer to BR "Inspection and Adjustment".

Is the stroke too big?

YES >>

• Bleed air from brake line and hose. Refer to BR "Bleeding Brake System".
• Check brake pedal, brake booster, and master cylinder for mount play, looseness, brake system fluid leakage, etc. Refer to brake pedal: BR "Inspection and Adjustment" or brake booster assembly BR "Inspection".

NO >> GO TO 2

2.CHECK ABS FUNCTION

1. Disconnect ABS actuator and electric unit (control unit) connector to deactivate ABS.
2. Check if braking force is normal in this condition.
3. Reconnect connector after inspection.

Is the inspection result normal?

YES >> Inspection End.

NO >> Check brake system.

Precautions

Component parts

VDC/TCS/ABS

Diagnosis system [abs actuator and electric unit (control unit)]

ABS Actuator and electric unit (control unit)

Diagnosis and repair work flow

Adjustment of steering angle sensor neutral position

C1101, C1102, C1103, C1104 Wheel sensor

C1105, C1106, C1107, C1108 Wheel sensor

C1109 Power and ground system

C1110, C1153, C1170 ABS Actuator and electric unit (control unit)

C1111 Pump motor

C1115 ABS Sensor [abnormal signal]

C1116 Stop lamp switch

C1120, C1122, C1124, C1126 ABS In valve system

C1121, C1123, C1125, C1127 ABS Out valve system

C1130 Engine signal

C1140 Actuator relay system

C1142 Press sensor

C1143 Steering angle sensor

C1144 Incomplete steering angle sensor adjustment

C1145, C1146 Yaw rate/side/decel g sensor

C1155 BR Fluid level low

C1164, C1165, C1166, C1167 CV/SV System

U1000 CAN Comm circuit

U1002 System comm (CAN)

Parking brake switch

VDC OFF Switch

ABS Warning lamp

Brake warning lamp

VDC OFF Indicator lamp

Slip indicator lamp

VDC/TCS/ABS

Excessive ABS Function operation frequency

Unexpected pedal reaction

The braking distance is long

Pedal vibration or ABS operation sound occurs

Vehicle jerks during VDC/TCS/ABS control

Wheel sensor

Sensor rotor

ABS Actuator and electric unit (control unit)