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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 447 (MULTIPLEX COMMUNICATION SYSTEM - DIAGNOSTICS)CIRCUIT INSPECTIONDTC B1293/93: GATEWAY ECU COMMUNICATION STOPINSPECTION PROCEDURE
2004 Toyota Matrix XR, FWD, Standard

Inspection Procedure

2004 Toyota Matrix XR, FWD, StandardSECTION Inspection Procedure
WARNING: This page is about a different car, the 2002 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check open door warning light. 

    CHECK:  Connection that the gateway ECU and BEAN (Body Electrical Area Network) can be checked by DTC transmitted by the body ECU.

    See INSPECT OPEN DOOR INDICATOR LIGHT.

    1. NG:  Replace the gateway ECU.
    2. OK:  Go to  2.
  2. Check wire harness 

    PREPARATION:  Disconnect connector "B8" of body ECU, "E11" of ECM and "G1" of gateway ECU.

    Fig 1: Testing Body ECU To ECM & ECM To Gateway ECU Wire Harness For Continuity
    G01113030Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    CHECK

    1. Check continuity between terminals MPX- of body ECU and MPX2 of ECM.
    2. Check continuity between terminals MPX1 of ECM and MPX1 of gateway ECU.

    OK:  There is a continuity in wire harness of both ( a and ( b, or either ( a or ( b.

    NOTE:

    If there is OPEN in wire harness of either ( a or ( b, please repair it.

    1. NG:  Repair or replace wire harness.
    2. OK:  Replace the gateway ECU.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.