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Home >> Toyota >> 2017 >> Prius V Two >> Repair and Diagnosis (Single Page) >> Brakes >> Traction Control >> Electronically Controlled Brake System - Diagnostic Codes & Symptom Tests >> Electronically Controlled Brake System >> DTC C1273/73: Low Output Signal of Rear Speed Sensor RH (Test Mode DTC); DTC C1274/74: Low Output Signal of Rear Speed Sensor LH (Test Mode DTC); DTC C1466/33: Rear Speed Sensor RH Circuit; DTC C1467/34: Rear Speed Sensor LH Circuit [08/2015 - ] >> Description
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DTC C1273/73: Low Output Signal of Rear Speed Sensor RH (Test Mode DTC); DTC C1274/74: Low Output Signal of Rear Speed Sensor LH (Test Mode DTC); DTC C1466/33: Rear Speed Sensor RH Circuit; DTC C1467/34: Rear Speed Sensor LH Circuit [08/2015 - ]: Description

The speed sensor detects wheel speed and sends the appropriate signals to the skid control ECU. These signals are used for ABS control.

DTCs C1273/73 and C1274/74 can be cleared when the speed sensor sends a wheel speed signal or when Test Mode ends. DTCs C1273/73 and C1274/74 are output only in Test Mode.

Fig 1: Identifying Rear Speed Sensor & Wheel Speed Signals
GTY235924Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
DTC Code INF Code DTC Detection Condition Trouble Area
C1466/33 521 While driving at 10 km/h (6 mph) or more, speed sensor output from one or two wheels is lower than that from other wheels for 15 seconds or more.
  • Open or short in speed sensor
  • Improperly installed speed sensor, or abnormal clearance between sensor and rotor
  • Open or short in wire harness
  • Improperly connected connector, deformation or corrosion of terminals
  • Rear speed sensor RH
  • Brake booster with master cylinder (Skid control ECU)
522 A malfunction occurs in 2 or more wheels.
523 An open is detected in the speed sensor signal circuit for 0.05 seconds or more.
  • Open or short in speed sensor
  • Open or short in wire harness
  • Improperly connected connector, deformation or corrosion of terminals
  • Rear speed sensor RH
  • Brake booster with master cylinder (Skid control ECU)
524 Instantaneous interruption of sensor signal from the malfunctioning wheel occurs 255 times or more.
  • Open or short in speed sensor
  • Improperly installed speed sensor, or abnormal clearance between sensor and rotor
  • Open or short in wire harness
  • Improperly connected connector, deformation or corrosion of terminals
  • Rear speed sensor RH
  • Brake booster with master cylinder (Skid control ECU)
526 When VM1 voltage is 8.6 V or more, sensor supply voltage drops for 0.5 seconds or more.
  • Open or short in wire harness
  • Brake booster with master cylinder (Skid control ECU)
527 While driving at 10 km/h (6 mph) or more, speed sensor output from one wheel is 0 km/h (0 mph) for 1 second or more.
  • Open or short in speed sensor
  • Improperly installed speed sensor, or abnormal clearance between sensor and rotor
  • Open or short in wire harness
  • Improperly connected connector, deformation or corrosion of terminals
  • Rear speed sensor RH
  • Brake booster with master cylinder (Skid control ECU)
528 When VM1 voltage is 8.6 V or more, sensor supply voltage drops for 60 seconds or more.
  • Open or short in wire harness
  • Brake booster with master cylinder (Skid control ECU)
C1467/34 531 While driving at 10 km/h (6 mph) or more, speed sensor output from one or two wheels is lower than that from other wheels for 15 seconds or more.
  • Open or short in speed sensor
  • Improperly installed speed sensor, or abnormal clearance between sensor and rotor
  • Open or short in wire harness
  • Improperly connected connector, deformation or corrosion of terminals
  • Rear speed sensor LH
  • Brake booster with master cylinder (Skid control ECU)
532 A malfunction occurs in 2 or more wheels.
533 An open is detected in the speed sensor signal circuit for 0.05 seconds or more.
  • Open or short in speed sensor
  • Open or short in wire harness
  • Improperly connected connector, deformation or corrosion of terminals
  • Rear speed sensor LH
  • Brake booster with master cylinder (Skid control ECU)
534 Instantaneous interruption of sensor signal from the malfunctioning wheel occurs 255 times or more.
  • Open or short in speed sensor
  • Improperly installed speed sensor, or abnormal clearance between sensor and rotor
  • Open or short in wire harness
  • Improperly connected connector, deformation or corrosion of terminals
  • Rear speed sensor LH
  • Brake booster with master cylinder (Skid control ECU)
536 When VM1 voltage is 8.6 V or more, sensor supply voltage drops for 0.5 seconds or more.
  • Open or short in wire harness
  • Brake booster with master cylinder (Skid control ECU)
537 While driving at 10 km/h (6 mph) or more, speed sensor output from one wheel is 0 km/h (0 mph) for 1 second or more.
  • Open or short in speed sensor
  • Improperly installed speed sensor, or abnormal clearance between sensor and rotor
  • Open or short in wire harness
  • Improperly connected connector, deformation or corrosion of terminals
  • Rear speed sensor LH
  • Brake booster with master cylinder (Skid control ECU)
538 When VM1 voltage is 8.6 V or more, sensor supply voltage drops for 60 seconds or more.
  • Open or short in wire harness
  • Brake booster with master cylinder (Skid control ECU)
C1273/73
C1274/74
- Detected only during Test Mode.
  • Rear speed sensor RH/LH
  • Sensor installation
  • Speed sensor rotor

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