Pinout Values and Diagnostic Parameters

BRAKE CONTROL: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: TERMINALS OF ECU

TERMINALS OF ECU

1. CHECK AUXILIARY BATTERY VOLTAGE
(a) Check the auxiliary battery voltage.
Standard voltage:
11 to 14 V
2. SKID CONTROL ECU INSPECTION
(a) Measure the voltage between each terminal or between each terminal and body ground.
(b) Connect the Techstream to the DLC3, and check the communication condition with the skid control ECU.
(c) Using an oscilloscope, check the pulse generated between each terminal or between each terminal and body ground.
NOTICE:
- 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 warning light / yellow (minor malfunction) comes on (malfunctioning).





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





















(d) Waveform 1 (Reference): Using an oscilloscope:





HINT: Normal waveform is output only when BS1 and BS2 voltages are normal (11 to 14 V).





(e) Waveform 2 (Reference): Using an oscilloscope:





HINT: Normal waveform is output only when BS1 and BS2 voltages are normal (11 to 14 V).





(f) Waveform 3 (Reference): Using an oscilloscope:





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





(g) Waveform 4 (Reference): Using an oscilloscope:





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





(h) Waveform 5 (Reference): Using an oscilloscope:










(i) Waveform 6 (Reference): Using an oscilloscope: