Inspection Procedure

WARNING: This page is about a different car, the 2002 Toyota Avalon. 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 Signal Waveform
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OK: Check and replace translate ECU.

If NG , go to step 2.
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 .

NG: Repair or replace harness or connector.

OK: Check and replace ECM.