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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 605 (MULTIPLEX COMMUNICATION SYSTEM - DIAGNOSIS)DTC B1271: 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 2002 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK CONTINUITY OF COMMUNICATION LINE 
    1. Check the wire harness among the combination meter and gateway ECU and skid control ECU.
      Fig 1: Identifying Combination Meter & Gateway ECU & Skid Control ECU
      G03387138Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Disconnect the connectors of the combination meter ECU, gateway ECU and skid control ECU.
      2. Check the continuity between terminal C8-2 (MPX+) of the combination meter vehicle's side connector and terminal G3-16 (MPI-2) of the gateway ECU vehicle's side connector.

        Standard: Continuity 

      3. Check the continuity between terminal C6-3 (MPX-) of the combination meter vehicle's side connector and terminal C8-17 (MPX1) of the skid control ECU vehicle's side connector.

        Standard: Continuity 

    1. NG: REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR 
    2. OK: Go to next step 
  2. CHECK COMBINATION METER ASSY 
    1. Inspect the meter power source input.
      1. Disconnect the meter connector C8.
      2. Check the voltage between each terminal of the meter vehicle's side connector.
      Fig 2: Identifying Meter Connector C8
      G03387139Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard: 

    SPECIFIED CONDITION

    Tester connection Condition Specified condition
    C8-12 (+B) - Body ground Constant 10 - 14 V
    1. NG: REPAIR OR REPLACE FUSE OR WIRE HARNESS AND CONNECTOR 
    2. OK: Go to next step 
  3. CHECK COMBINATION METER ASSY 
    1. Inspect the meter body ground.
      1. Disconnect the meter connector C8.
      2. Check the continuity between terminal 11 (E) of the meter and the body ground.

      Standard: Continuity 

      Fig 3: Identifying Meter Connector C8
      G03387140Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR 
    2. OK: REPLACE COMBINATION METER ASSY 
RENDER: 1.0x

NO RELATED

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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.