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Terminals Of Ecu

  1. CHECK BATTERY VOLTAGE 
    1. Measure the battery voltage.

      Standard voltage: 10 to 14 V 

  2. CHECK SKID CONTROL ECU 
    1. Measure the voltage and resistance between each terminal or between each terminal and the body ground.
    2. Connect the intelligent tester (with CAN VIM) to the DLC3, and check the communication condition with the skid control ECU.
    3. Using an oscilloscope, check that the pulse generates between each terminal or between each terminal and the body ground.
      NOTE:
      • Each inspection should be performed from the back of the connector with the connector connected to the skid control ECU.
      • The voltage between the terminals of the brake actuator assembly may become 0 V due to the fail-safe function when the ECB warning light comes on (malfunctioning).
        Fig 1: Identifying ECU Connector Terminals
        G04474568Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      Inspect the ECU from the wire harness side while the connector is connected.

      CONNECTOR TERMINAL VOLTAGE SPECIFICATIONS

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      R1+ (S7-2) - GND (S7-1) P - W Main relay power 1 Push power switch ON (READY) 9.1 to 13.6 V
      BS1 (S7-3) - GND (S7-1) B - W Battery source 1 Push power switch ON (READY)
      Approx. 1.5 sec. after pushing power switch ON (READY)      		 8.8 to 14 V
      SMC1 (S7-4) - GND (S7-1) Y - W Master cut solenoid 1 output Push power switch ON (READY)
      Brake pedal depressed approx. 1.5 sec. after pushing power switch ON
      (READY)      		 Below 1.5 V
      +BCTY (S7-5) - GND (S7-1) V - W Courtesy power input Driver door open --> close Approx. 5 sec. 8 to 16 V --> Below 1 V
      SLAFR- (S7-6) - GND (S7-1) W - W FR solenoid (-) output Push power switch ON (READY)
      Approx. 1.5 sec. after pushing power switch ON (READY)      		 Below 1.5 V
      SLAFR+ (S7-7) - GND (S7-1) R - W FR solenoid (+) output Push power switch ON (READY)
      Brake pedal depressed approx. 1.5 sec. after pushing power switch ON
      (READY)      		 Pulse generation (see WAVEFORM 1 REFERENCE )
      E (S7-8) - GND (S7-1) L - W Pressure sensor ground Push power switch OFF Below 1 Ω
      VCM1 (S7-9) - GND (S7-1) P - W Pressure sensor power Push power switch ON (READY) 4.75 to 5.25 V
      MR1+ (S7-11) - GND (S7-1) GR - W Motor relay power 1 Push power switch ON (READY)
      Approx. 1.5 sec. after pushing power switch ON
      (READY)      		 8.8 to 14 V
      SR1 (S7-12) - GND (S7-1) L - W Main relay output 1 Push power switch ON (READY)
      Approx. 1.5 sec. or more after pushing power switch ON (READY)      		 Below 1 V
      SCSS (S7-13) - GND (S7-1) BR - W Stroke simulator cut solenoid output Push power switch ON (READY)
      Brake pedal depressed      		 Below 1.5 V
      SLARL+ (S7-15) - GND (S7-1) L - W RL solenoid (+) output Push power switch ON (READY)
      Brake pedal depressed approx. 1.5 sec. after pushing power switch ON
      (READY)      		 Pulse generation
      (see WAVEFORM 1 REFERENCE )
      SLRRL+ (S7-16) - GND (S7-1) W - W RL solenoid (+) output Push power switch ON (READY)
      Brake pedal depressed approx. 1.5 sec. after pushing power switch ON
      (READY)      		 Pulse generation
      (see WAVEFORM 1 REFERENCE )
      SLRFR+ (S7-17) - GND (S7-1) Y - W FR solenoid (+) output Push power switch ON (READY)
      After approx. 1.5 sec., brake pedal depressed --> released      		 Pulse generation
      (see WAVEFORM 2 REFERENCE )
      PRL (S7-18) - GND (S7-1) G - W RL pressure sensor input Push power switch ON (READY)
      Brake pedal released      		 0.3 to 0.8 V
      SG1 (S7-20) - GND (S7-1) BR - W Pressure sensor shield ground 1 Push power switch OFF Below 1 Ω
      PACC (S7-21) - GND (S7-1) W - W Accumulator pressure sensor input Push power switch ON (READY)
      After pump motor operates and stops by pedal operation      		 3.3 to 4.7 V
      FR- (S7-22) - GND (S7-1) L - W FR sensor (-) input Push power switch OFF Below 1 Ω
      PFR (S7-23) - GND (S7-1) Y - W FR pressure sensor input Push power switch ON (READY)
      Brake pedal released      		 0.3 to 0.8 V
      MR1 (S7-25) - GND (S7-1) L - W Motor relay output 1 Push power switch ON (READY)
      Pump motor is operating      		 Below 1.5 V
      SLRRL- (S7-26) - GND (S7-1) P - W RL solenoid (-) output Push power switch ON (READY)
      Approx. 1.5 sec. after pushing power switch ON
      (READY)      		 Below 1.5 V
      SLARL- (S7-27) - GND (S7-1) LG - W RL solenoid (-) output Push power switch ON (READY)
      Approx. 1.5 sec. after pushing power switch ON
      (READY)      		 Below 1.5 V
      MTT (S7-29) - GND (S7-1) R - W Motor test input Push power switch ON (READY)
      Pump motor is operating      		 3.5 V or higher
      PMC1 (S7-30) - GND (S7-1) R - W Master pressure sensor input 1 Push power switch ON (READY)
      Brake pedal released      		 0.3 to 0.8 V
      PCK1 (S7-31) - GND (S7-1) B - W Pressure sensor check output 1 Push power switch ON (READY)
      Approx. 1.5 sec. after pushing power switch ON
      (READY)      		 4.75 to 5.25 V
      FR+ (S7-32) - GND (S7-1) P - W FR sensor (+) input Vehicle speed input Pulse generation
      (see WAVEFORM 3 REFERENCE )
      SLRFR- (S7-34) - GND (S7-1) B - W FR solenoid (-) output Push power switch ON (READY)
      Approx. 1.5 sec. after pushing power switch ON
      (READY)      		 Below 1.5 V
      +BI1 (S8-3) - GND (S8-1, 2) B - W Main relay power input 1 Push power switch OFF 10 to 14 V
      +BO1 (S8-5) - GND (S8-1, 2) Y - W Main relay power output 1 Push power switch ON (IG) 8.8 to 14 V
      IG1 (S8-7) - GND (S8-1, 2) B - W IG1 power Push power switch ON (IG) 10 to 14 V
      RSS (S8-10) - GND (S8-1, 2) BR - W Speed sensor shield ground Push power switch OFF Below 1 Ω
      BZ (S8-12) - GND (S8-1, 2) BR - W Warning buzzer output Push power switch ON (READY)
      Buzzer is operating      		 Below 1 V
      STP (S8-14) - GND (S8-1, 2) R - W Stop light switch signal input Push power switch ON (READY)
      Brake pedal depressed --> released      		 8 to 14 V --> Below 1 V
      CAN-L (S8-18) - GND (S8-1, 2) W - W CAN communication (Send and receive-) Check DTC using intelligent tester CAN communication's DTC is not output
      CAN-H (S8-19) - GND (S8-1, 2) B - W CAN communication (Send and receive+) Check DTC using intelligent tester CAN communication's DTC is not output
      FAIL (S8-20) - GND (S8-1, 2) P - W Capacitor communication (Receive) Push power switch ON (READY)
      Approx. 1.5 sec. after pushing power switch ON (READY)      		 Pulse generation
      (See WAVEFORM 5 REFERENCE )
      SP1 (S8-22) - GND (S8-1, 2) V - W Speed meter output Vehicle speed input Pulse generation
      (See WAVEFORM 4 REFERENCE )
      RL- (S8-27) - GND (S8-1, 2) B - W RL sensor (-) input Push power switch OFF Below 1 Ω
      D/G (S8-28) - GND (S8-1, 2) W - W Diagnosis output Push power switch ON (READY) 9.1 to 13.6 V
      ENA (S8-30) - GND (S8-1, 2) B - W Capacitor communication (Send) Push power switch ON (READY)
      Approx. 1.5 sec. after pushing power switch ON (READY)      		 Pulse generation
      (See WAVEFORM 6 REFERENCE )
      TS (S8-32) - GND (S8-1, 2) L - W Sensor diagnosis check input Push power switch ON (READY) Below 1.5 V --> 9.1 to 13.6V
      VBZ (S8-33) - GND (S8-1, 2) B - W Warning buzzer power Push power switch ON (READY) 9.1 to 13.6 V
      RL+ (S8-35) - GND (S8-1, 2) W - W RL sensor (+) input Vehicle speed input Pulse generation
      (see WAVEFORM 3 REFERENCE )
      +BO2 (S9-4) - GND (S9-1, 2) W - W-B Main relay power output 2 Push power switch ON (READY) 8.8 to 14 V
      +BI2 (S9-5) - GND (S9-1, 2) R - W-B Main relay power input 2 Push power switch OFF 10 to 14 V
      VCSK (S9-6) - GND (S9-1, 2) B - W-B Stroke sensor power Push power switch ON (READY) 3.75 to 4.95 V
      SSK (S9-7) - GND (S9-1, 2) Shielded - W-B Stroke sensor shield ground Push power switch OFF Below 1 Ω
      SKG (S9-8) - GND (S9-1, 2) W - W-B Stroke sensor ground Push power switch OFF Below 1 Ω
      PKB (S9-14) - GND (S9-1, 2) R - W-B Parking brake signal input Parking brake applied --> released Below 1.5 V --> 9.1 to 13.6V
      SKS1 (S9-21) - GND (S9-1, 2) R - W-B Stroke sensor signal input 1 Push power switch ON (READY)
      Brake pedal released      		 0.46 to 1.35 V
      SKS2 (S9-22) - GND (S9-1, 2) G - W-B Stroke sensor signal input 2 Push power switch ON (READY)
      Brake pedal released      		 2.56 to 4.35 V
      RR- (S9-23) - GND (S9-1, 2) B - W-B RR sensor (-) input Push power switch OFF Below 1 Ω
      RR+ (S9-31) - GND (S9-1, 2) W - W-B RR sensor (+) input Vehicle speed input Pulse generation
      (see WAVEFORM 3 REFERENCE )
      SLAFL+ (S10-1) - GND (S10-4) P - W-B FL solenoid (+) output Push power switch ON (READY)
      Brake pedal depressed approx. 1.5 sec. after pushing power switch ON (READY)      		 Pulse generation
      (see WAVEFORM 1 REFERENCE )
      SLAFL- (S10-2) - GND (S10-4) O - W-B FL solenoid (-) output Push power switch ON (READY)
      Approx. 1.5 sec. after pushing power switch ON (READY)      		 Below 1.5 V
      SMC2 (S10-3) - GND (S10-4) LG - W-B Master cut solenoid 2 output Push power switch ON (READY)
      Brake pedal depressed approx. 1.5 sec. after pushing power switch ON (READY)      		 Below 1.5 V
      IG2 (S10-5) - GND (S10-4) O - W-B IG2 power Push power switch ON (READY) 10 to 14 V
      LBL (S10-6) - GND (S10-4) P - W-B Brake fluid level switch input Reservoir level switch OFF --> ON 4 to 4.65 V--> Below 1.5 V
      BS2 (S10-7) - GND (S10-4) P - W-B Battery source 2 Push power switch ON (READY)
      Approx. 1.5 sec. after pushing power switch ON (READY)      		 8.8 to 14 V
      SLRFL+ (S10-8) - GND (S10-4) Y - W-B FL solenoid (+) output Push power switch ON (READY)
      After approx. 1.5 sec., brake pedal depressed --> released      		 Pulse generation
      (see WAVEFORM 2 REFERENCE )
      SLARR- (S10-9) - GND (S10-4) P - W-B RR solenoid (-) output Push power switch ON (READY)
      Approx. 1.5 sec. after pushing power switch ON (READY)      		 Below 1.5 V
      SG2 (S10-12) - GND (S10-4) Shielded - W-B Pressure sensor shield ground 2 Push power switch OFF Below 1 Ω
      FSS (S10-13) - GND (S10-4) BR - W-B Speed sensor shield ground Push power switch OFF Below 1 Ω
      VCM2 (S10-14) - GND (S10-4) B - W-B Pressure sensor power 2 Push power switch ON (READY) 4.75 to 5.25 V
      SR2 (S10-15) - GND (S10-4) V - W-B Main relay output 2 Push power switch ON (READY)
      Approx. 1.5 sec. after pushing power switch ON (READY)      		 Below 1 V
      R2+ (S10-17) - GND (S10-4) Y - W-B Main relay power 2 Push power switch ON (READY) 9.1 to 13.6 V
      SLRRR- (S10-18) - GND (S10-4) BR - W-B RR solenoid (-) output Push power switch ON (READY)
      Approx. 1.5 sec. after pushing power switch ON (READY)      		 Below 1.5 V
      SLARR+ (S10-19) - GND (S10-4) V - W-B RR solenoid (+) output Push power switch ON (READY)
      Brake pedal depressed approx. 1.5 sec. after pushing power switch ON (READY)      		 Pulse generation
      (see WAVEFORM 1 REFERENCE )
      SLRRR+ (S10-20) - GND (S10-4) R - W-B RR solenoid (+) output Push power switch ON (READY)
      Brake pedal depressed approx. 1.5 sec. after pushing power switch ON (READY)      		 Pulse generation
      (see WAVEFORM 1 REFERENCE )
      PCK2 (S10-21) - GND (S10-4) L - W-B Pressure sensor check output 2 Push power switch ON (READY) 4.75 to 5.25 V
      FL- (S10-22) - GND (S10-4) G - W-B FL sensor (-) input Push power switch OFF Below 1 Ω
      PFL (S10-23) - GND (S10-4) R - W-B FL pressure sensor input Push power switch ON (READY)
      Brake pedal released      		 0.3 to 0.8 V
      MR2+ (S10-25) - GND (S10-4) R - W-B Motor relay power 2 Push power switch ON (READY)
      Approx. 1.5 sec. after pushing power switch ON (READY)      		 8.8 to Below 14 V
      SLRFL- (S10-26) - GND (S10-4) L - W-B FL solenoid (-) output Push power switch ON (READY)
      Approx. 1.5 sec. after pushing power switch ON (READY)      		 Below 1.5 V
      PMC2 (S10-27) - GND (S10-4) W - W-B Master pressure sensor input 2 Push power switch ON (READY)
      Brake pedal released      		 0.3 to 0.8 V
      FL+ (S10-28) - GND (S10-4) R - W-B FL sensor (+) input Vehicle speed input Pulse generation
      (see WAVEFORM 3 REFERENCE )
      E2 (S10-29) - GND (S10-4) G - W-B Pressure sensor ground 2 Push power switch OFF Below 1 Ω
      MR2 (S10-30) - GND (S10-4) G - W-B Motor relay output 2 Push power switch ON (READY)
      Pump motor is operating      		 Below 1.5 V
      PRR (S10-31) - GND (S10-4) Y - W-B RR pressure sensor input Push power switch ON (READY)
      Brake pedal released      		 0.3 to 0.8 V
    4. Using an oscilloscope, check the waveform 1.

      Waveform 1 (Reference) 

      WAVEFORM 1 REFERENCE

      Item Content
      Symbols (Terminal No.) SLAFR+ (S7-7) - GND (S7-1)
      SLARL+ (S7-15) - GND (S7-1)
      SLRRL+ (S7-16) - GND (S7-1)
      SLAFL+ (S10-2) - GND (S10-4)
      SLARR+ (S10-19) - GND (S10-4)
      SLRRR+ (S10-20) - GND (S10-4)
      Tool Setting 5 V/DIV., 200 msec./DIV.
      Condition Brake pedal depressed
      Fig 2: Checking Waveform 1 Using Oscilloscope
      G04474569Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE: Normal waveform is output only when BS 1 and 2 voltages are normal (10 to 14 V).
    5. Using an oscilloscope, check the waveform 2.

      Waveform 2 (Reference) 

      WAVEFORM 2 REFERENCE

      Item Content
      Symbols (Terminal No.) SLRFR+ (S7-17) - GND (S7-1)
      SLRFL+ (S10-8) - GND (S10-4)
      Tool Setting 5 V/DIV., 200 msec./DIV.
      Condition Brake pedal depressed --> released
      NOTE: Normal waveform is output only when BS 1 and 2 voltages are normal (10 to 14 V).
      Fig 3: Checking Waveform 2 Using Oscilloscope
      G04474570Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Using an oscilloscope, check the waveform 3.

      Waveform 3 (Reference) 

      WAVEFORM 3 REFERENCE

      Item Content
      Symbols (Terminal No.) FR+ (S7-32) - GND (S7-1)
      RL+ (S8-35) - GND (S8-1, 2)
      RR+ (S9-31) - GND (S9-1, 2)
      FL+ (S10-28) - GND (S10-4)
      Tool Setting 1 V/DIV., 200 msec./DIV.
      Condition While driving at approximately 18 mph (30 km/h)
      NOTE: As the vehicle speed (tire rotating speed) becomes faster, the cycle becomes shorter and the output voltage becomes larger.
      Fig 4: Checking Waveform 3 Using Oscilloscope
      G04474571Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    7. Using an oscilloscope, check the waveform 4.

      Waveform 4 (Reference) 

      WAVEFORM 4 REFERENCE

      Item Content
      Symbols (Terminal No.) SP1 (S8-22) - GND (S8-1, 2)
      Tool Setting 5 V/DIV., 50 msec./DIV.
      Condition While driving at approximately 12 mph (20 km/h)
      NOTE: As the vehicle speed (tire rotating speed) becomes faster, the cycle becomes shorter.
      Fig 5: Checking Waveform 4 Using Oscilloscope
      G04474572Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    8. Using an oscilloscope, check the waveform 5.

      Waveform 5 (Reference) 

      WAVEFORM 5 REFERENCE

      Item Content
      Symbols (Terminal No.) FAIL (S8-20) - GND (S8-1, 2)
      Tool Setting 5 V/DIV., 200 msec./DIV.
      Condition Power switch ON (READY)
      Fig 6: Checking Waveform 5 Using Oscilloscope
      G04474573Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    9. Using an oscilloscope, check the waveform 6.

      Waveform 6 (Reference) 

      WAVEFORM 6 REFERENCE

      Item Content
      Symbols (Terminal No.) ENA (S8-30) - GND (S8-1, 2)
      Tool Setting 5 V/DIV., 100 msec./DIV.
      Condition Power switch ON (READY)
      Fig 7: Checking Waveform 6 Using Oscilloscope
      G04474574Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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