Component Testing
For component testing, see CIRCUIT TESTS . ABS ECU values can be measured using Toyota Hand-Held Tester and Breakout Box. ABS circuits and harness can also be tested by backprobing ABS ECU connectors and comparing measured voltages with ABS ECU standard values chart. See Fig 1. For ABS ECU standard values chart for vehicles with TRAC, see BRAKE SYSTEM - TRACTION CONTROL article in BRAKES section.