Inspection Procedure

WARNING: This page is about a different car, the 2002 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.

Check Translate ECU Communication.
Reference: inspection using oscilloscope

Preparation :
1. Remove the translate ECU.
2. Connect the oscilloscope to each of the terminals ENG+ or TRC+ and GND of the translate ECU harness side connector.
  Check : Start the engine, and check the signal waveform.
  
  Fig 1: Identifying Normal Waveform
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK : Check and replace translate ECU.
2. NG : Go to next step.
Check for open and short circuit in harness and connector between each of terminals ENG+, ENG-, TRC+ and TRC- of translate ECU and ECM. See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE .
1. NG : Repair or replace harness or connector.
2. OK : Check and replace ECM.