Pinout Values and Diagnostic Parameters

BRAKE CONTROL: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: TERMINALS OF ECU

TERMINALS OF ECU

1. CHECK BATTERY VOLTAGE
(a) Measure the battery voltage.
Standard voltage:
10 to 14 V
2. CHECK SKID CONTROL ECU
(a) Measure the voltage and resistance between each terminal or between each terminal and the body ground.
(b) Connect Techstream to the DLC3, and check the communication condition with the skid control ECU.
(c) Using an oscilloscope, check that the pulse generates between each terminal or between each terminal and the body ground.
NOTICE:
- 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 brake control warning light comes on (malfunctioning).




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

























(d) Using an oscilloscope, check the waveform 1.





NOTE: Normal waveform is output only when BS 1 and 2 voltages are normal (10 to 14 V).





(e) Using an oscilloscope, check the waveform 2.





NOTE: Normal waveform is output only when BS 1 and 2 voltages are normal (10 to 14 V).





(f) Using an oscilloscope, check the waveform 3.





NOTE: As the vehicle speed (tire rotating speed) becomes faster, the cycle becomes shorter and the output voltage becomes larger.





(g) Using an oscilloscope, check the waveform 4.





NOTE: As the vehicle speed (tire rotating speed) becomes faster, the cycle becomes shorter.





(h) Using an oscilloscope, check the waveform 5.










(i) Using an oscilloscope, check the waveform 6.