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Home >> Scion >> 2012 >> tC Standard Trans >> Repair and Diagnosis (Single Page) >> Steering >> Manual Steering >> Power Steering System (Diagnostics - Introduction) >> Power Steering System >> System Diagram >> System Diagram

System Diagram

Fig 1: Power Steering System Diagram
GTY310356Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Transmitting ECU
(Transmitter)
Receiving ECU Signal Communication Method
ECM Power Steering ECU
  • Engine speed signal
  • TC terminal condition
CAN
Skid Control ECU Power Steering ECU
  • Vehicle speed (SP1) status signal
  • Vehicle speed (SP1) signal
  • Test mode signal
  • VSC control signal
  • ABS control signal
  • Each wheel speed signal
  • Each wheel speed sensor error signal
  • Yaw rate 1 zero point signal
  • Acceleration sensor (GL1 and GL2) zero point value signal
  • Yaw rate and acceleration sensor installation information signal
  • Yaw rate zero point error signal
  • Each wheel speed sensor power supply drop state signal
  • TRC operating signal
  • Stop light switch signal
  • Brake control distinction signal
CAN
Steering Angle Sensor Power Steering ECU
  • Data continuity (valid/invalid) signal
  • +B open circuit signal
  • Sensor malfunction signal
  • Steering angle signal
  • Zero point memory (in sensor) valid/invalid signal
  • Zero point (stored in steering angle sensor) signal
CAN
Yaw Rate Sensor and Acceleration Sensor Power Steering ECU
  • Yaw rate sensor and acceleration sensor signal
  • Yaw rate sensor and acceleration sensor (valid/invalid) signal
  • Sensor power supply voltage (IG) (valid/invalid) signal
  • Yaw rate sensor and acceleration sensor error signal
  • Data output response request signal
  • Yaw rate and acceleration sensor CPU monitor signal
  • Sensor type distinction signal
  • Yaw rate difference value signal
CAN
Power Steering ECU ECM Power steering idle up request signal CAN
Power Steering ECU A/C Amplifier Loading control level signal CAN
Power Steering ECU Combination Meter
  • Power steering warning light on request signal
  • Power steering diagnosis code signal
CAN