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Home >> Toyota >> 2022 >> Corolla LE >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (Except HEV) (W/ Electric Parking Brake) - Diagnostics - Introduction (1 Of 3) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model with Electric Parking Brake System) >> Terminals Of Ecu [11/2022 - ] >> Terminals Of Ecu [11/2022 - ]

Terminals Of Ecu [11/2022 - ]

  1. TERMINAL INSPECTION 
    1. Disconnect the A51 skid control ECU (brake actuator assembly) connector and measure the voltage and resistance on the wire harness side.
      GTY1111122Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Actuator Assembly))      		 - -

      HINT: 

      • As a waterproof connector is used for the brake actuator assembly, voltage and waveform inspections cannot be performed with the connector connected.
      • Use the GTS to read data and perform Active Tests when inspecting the operation and communication status of the brake actuator assembly.

        Refer to DATA LIST / ACTIVE TEST [11/2022 - ]

    2. Measure the voltage or resistance according to the value(s) in the table below.
      STANDARD

      Terminal No. (Symbol) Terminal Description Condition Specified Condition
      A51-1 (+BM) - Body ground ABS motor relay power supply Always 11 to 14 V
      A51-2 - - -
      A51-3 - - -
      A51-4 (STP) - Body ground Stop light switch assembly signal input Stop light switch assembly on → off (Brake pedal depressed → released) 11 to 14 V → 1.5 V or less
      A51-5 (CANH) CAN communication line H - -
      A51-6 - - -
      A51-7 (FL-) Front wheel speed LH (-) signal input - -
      A51-8 - - -
      A51-9 - - -
      A51-10 - - -
      A51-11 (CA2H) CAN communication line H - -
      A51-12 - - -
      A51-13 - - -
      A51-14 (GND2) - Body ground Pump motor ground 1 minute or more after disconnecting the cable from the negative (-) battery terminal Below 1 Ω
      A51-15 - - -
      A51-16 - - -
      A51-17 - - -
      A51-18 - - -
      A51-19 (CANL) CAN communication line L - -
      A51-20 - - -
      A51-21 (FR+) Front wheel speed RH (+) power supply output - -
      A51-22 (RR+) Rear wheel speed RH (+) power supply output - -
      A51-23 (RL-) Rear wheel speed LH (-) signal input - -
      A51-24 (FL+) Front wheel speed LH (+) power supply output - -
      A51-25 (CA2L) CAN communication line L - -
      A51-26 (FR-) Front wheel speed RH (-) signal input - -
      A51-27 (STPO) - Body ground Stop light signal output Always 11 to 14 V
      A51-28 - - -
      A51-29 - - -
      A51-30 (+BS) - Body ground ABS solenoid relay power supply Always 11 to 14 V
      A51-31 - - -
      A51-32 - - -
      A51-33 (SP1) Speed signal output - -
      A51-34 - - -
      A51-35 - - -
      A51-36 (IGR) - Body ground IG power source input Ignition switch ON 11 to 14 V
      A51-37 (RR-) Rear wheel speed RH (-) signal input - -
      A51-38 (CSW) - Body ground VSC OFF switch (combination switch assembly) input VSC OFF switch (combination switch assembly) on → off (Pressed → not pressed) Below 50 Ω → 10 kΩ or higher
      A51-39 (RL+) Rear wheel speed LH (+) power supply output - -
      A51-40 - - -
      A51-41 - - -
      A51-42 (HZRI) - Body ground Brake hold switch (electric parking brake switch assembly) input Brake hold switch (electric parking brake switch assembly) on → off (Pressed → not pressed) Below 50 Ω → 10 kΩ or higher
      A51-43 (STP2) - Body ground Stop light signal input Stop light switch assembly on → off (Brake pedal depressed → released) 11 to 14 V → 1.5 V or less
      A51-44 - - -
      A51-45 - - -
      A51-46 (GND1) - Body ground Skid control ECU (brake actuator assembly) ground 1 minute or more after disconnecting the cable from the negative (-) battery terminal Below 1 Ω
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