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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 553 (MULTIPLEX COMMUNICATION SYSTEM - DIAGNOSTICS)CIRCUIT INSPECTIONDTC B1271/71: COMBINATION METER 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 2003 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check combination meter ECU. 

    CHECK:

    Start the engine and check that the speed meter and tachometer operate normally.

    NOTE: With this inspection, the combination meter ECU CPU can be diagnosed if it works normally or not.
    1. NG : Replace the combination meter ECU. 
    2. OK : Go to Next Step 
  2. Check wire harness 

    PREPARATION:

    Disconnect the connector "B11" of back door ECU, "C6" of combination meter ECU "B7" of body ECU.

    CHECK:

    1. Check continuity between terminals MPX1 of back door ECU and MPX2 of combination meter ECU.
    2. Check continuity between terminals MPX1 of combination meter and MPX2 of body 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 combination meter 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.