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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 605 (MULTIPLEX COMMUNICATION SYSTEM - DIAGNOSIS)DTC B1247: TIRE PRESSURE MONITOR RECEIVER 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 tire pressure control ECU and gateway ECU and A/C amplifier.
      Fig 1: Identifying Tire Pressure Control ECU & Gateway ECU & A/C Amplifier
      G03387115Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Disconnect the connectors of the tire pressure control ECU, gateway ECU and A/C amplifier.
      2. Check the continuity between terminal T9-3 (MPX2) of the tire pressure control ECU vehicle's side connector and terminal A9-10 (MPX-) of the A/C amplifier vehicle's side connector.

        Standard: Continuity 

      3. Check the continuity between terminal T9-2 (MPX1) of the tire pressure control ECU vehicle's side connector and terminal G3-5 (MPI-1) of the gateway vehicle's side connector.

        Standard: Continuity 

    1. NG: REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR 
    2. OK: Go to next step 
  2. CHECK TIRE PRESSURE MONITOR RECEIVER ASSY 
    1. Inspect the ECU power source input.
      1. Disconnect the ECU connector T9.
      2. Check the voltage between each terminal of the ECU vehicle's side connector.
    Fig 2: Identifying ECU Connector T9
    G03387116Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard: 

    SPECIFIED CONDITION

    Tester connection Condition Specified condition
    T9-1 (+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 TIRE PRESSURE MONITOR RECEIVER ASSY 
    1. Inspect the ECU body ground.
      1. Disconnect the ECU connector T9.
      2. Check the continuity between terminal 6 (GND) of the ECU and the body ground.

      Standard: Continuity 

    Fig 3: Identifying Terminal 6 (GND) ECU
    G03387117Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE FUSE OR WIRE HARNESS AND CONNECTOR 
    2. OK: REPLACE TIRE PRESSURE MONITOR RECEIVER 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.