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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> Abs With EBD & BA & TRAC & VSC System - Diagnostics >> Circuit Inspection >> DTC 53 ECM Communication Circuit Malfunction >> Inspection Procedure

Inspection Procedure

  1. Check Translate ECU communication  .

    Reference: inspection using oscilloscope  .

    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.

    Start the engine, and check the signal waveform.

    Fig 1: Identifying Normal Signal Waveform
    G01081236Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: Check and replace Translate ECU  .
    2. NG: Go to next 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  .
    1. OK: Check and replace ECM  .
    2. NG: Repair or replace harness or connector  .
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