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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 532 (HYBRID CONTROL SYSTEM - DIAGNOSIS)DTC P0A1D/142: HYBRID POWERTRAIN CONTROL MODULEINSPECTION 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 2004 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT HYBRID VEHICLE CONTROL ECU (ST2 VOLTAGE) 
    1. Disconnect the H14 HV control ECU connector.
    2. Measure the voltage between the terminal of the HV control ECU connector and body ground with the power switch turned OFF.
      VOLTAGE CHECK

      Tester Connection Specified Condition
      ST2 (H14-5) - Body ground Below 1 V
    3. Reconnect the HV control ECU connector.

    NG: Go to step 2 

    Fig 1: Disconnecting H14 HV Control ECU Connector
    G02917554Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go To Next Step 

    CHECK FOR INTERMITTENT PROBLEMS (See  CHECK FOR INTERMITTENT PROBLEMS   ) 

  2. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - POWER SOURCE CONTROL ECU) 
    1. Disconnect the H14 HV control ECU connector.
    2. Disconnect the P6 power source control ECU connector.
    3. Measure the voltage between the terminal of the HV control ECU connector or power source control ECU and body ground with the power switch turned OFF.
      VOLTAGE CHECK

      Tester Connection Specified Condition
      ST2 (H14-5) or STSW (P6-39) - Body ground Below 1 V
    4. Reconnect the power source control ECU connector.
    5. Reconnect the HV control ECU connector.
      Fig 2: Disconnecting H14 HV Control ECU Connector
      G02917555Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 3: Disconnecting P6 Power Source Control ECU Connector
    G02917556Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: POWER SOURCE CONTROL ECU 

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.