Inspection Procedure

WARNING: This page is about a different car, the 2005 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

Check skid control ECU communication.
(REFERENCE) INSPECTION USING OSCILLOSCOPE

PREPARATION:
1. Remove the skid control ECU.
2. Connect the oscilloscope to each of terminal ENG+ or TRC+ and GND of the skid control ECU.
  CHECK:
  
  Start the engine, and check the signal waveform.
  
  Fig 1: Signal Waveform Graph
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Check and replace skid control ECU.
2. OK: Go to next step.
Check for open and short circuit in harness and connector between each of terminals ENG+, ENG-, TRC+, TRC- of skid control ECU and ECM (See HOW TO USE THE DIAGNOSTIC TABLE AND INSPECTION ).
1. NG: Repair or replace harness or connector.
2. OK: Check and replace ECM.