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Engine Control System (Diagnostics) (Hybrid) - Introduction: General Description: Caution

  1. Airbag system wiring harness is routed near the ECM, main relay and fuel pump relay.
    CAUTION:
    • Do not use electrical test equipment on the airbag system circuits.
    • Be careful not to damage the airbag system wiring harness when servicing the ECM, TCM, main relay and fuel pump relay.
  2. Never connect the battery in reverse polarity. Doing so will damage the ECM instantly, and other parts will also be damaged.
    NOTE:
    • When connecting 12 volt auxiliary battery, wait for one minute or more after disconnecting connectors.
    • When disconnecting or connecting 12 volt auxiliary battery, make sure to avoid battery terminal from multiple contacts with cable within one minute.
    • When trouble occurs in vehicle by connection of 12 volt auxiliary battery terminal, disconnect 12 volt auxiliary battery terminal and reconnect after one minute or more. Then confirm the trouble has been solved.
  3. Before connecting 12 volt auxiliary battery, make sure that no obstacles exist within the operation range of active grille shutter. Active grille shutter may be activated when 12 volt auxiliary battery is connected.
  4. Do not disconnect the battery cables while the engine is running. A large counter electromotive force will be generated in the generator, and this voltage may damage electronic parts such as ECM etc.
  5. When disconnecting the connectors of the electrical components, always be sure to turn the ignition switch to OFF. Perform the Clear Memory Mode after connecting the connectors. < Ref. to CLEAR MEMORY MODE . >
  6. When measuring the voltage or resistance of individual sensor or all electrical control modules, use a tapered pin with a diameter of 0.6 mm (0.024 in) or less and touch it to the tip of terminal.
    Fig 1: Caution For Measuring Voltage/Resistance Of Individual Sensor And Electrical Control Modules
    G10263207Courtesy of SUBARU OF AMERICA, INC.

    Never insert the tapered pin into the terminal because it deforms inside which may lead to a malfunction.

    Fig 2: Caution For Inserting Tapered Pin Into Terminal Because Deforms Inside
    G10263208Courtesy of SUBARU OF AMERICA, INC.
    CAUTION: When replacing the ECM, be careful not to use the ECM of wrong specification to avoid any damage on the fuel injection system.
    NOTE: When replacing the ECM of the models with immobilizer, immobilizer system must be registered. For detailed operation procedure, refer to the "REGISTRATION MANUAL FOR IMMOBILIZER".
  7. Take care not to allow water to get into the connectors when servicing or washing the vehicle in rainy weather. Avoid exposure to water even if the connectors are waterproof.
  8. Use ECM mounting stud bolts for the grounding point when measuring voltage and resistance inside the passenger compartment.
    Fig 3: Identifying ECM Mounting Stud Bolt
    G10316343Courtesy of SUBARU OF AMERICA, INC.
  9. Use the engine ground terminal or engine assembly for the grounding point when measuring the voltage and resistance in engine compartment.
    Fig 4: Locating Engine Ground Terminal
    G09487410Courtesy of SUBARU OF AMERICA, INC.
  10. All parts related to the engine control system are precision parts. Do not drop or otherwise apply impact. Do not reuse the parts that are dropped accidentally.
  11. Do not connect the wiring of electrical parts directly to the battery terminals. It may cause erroneous operation of the charge control, leading to early deterioration of the battery or discharged battery.
  12. Observe the following cautions when installing a radio in vehicle.
    CAUTION:
    • The antenna must be kept as far apart as possible from the ECM. < Ref. to CONTROL MODULE , LOCATION, Electrical Component Location. >
    • The antenna feeder must be placed as far apart as possible from the ECM and engine control system harness.
    • Carefully adjust the antenna for correct matching.
    • When mounting a large power type radio, pay special attention to the three items mentioned above.
    • Incorrect installation of the radio may affect the operation of ECM.
  13. When disconnecting the fuel hose, be sure to release the fuel pressure beforehand. < Ref. to RELEASING OF FUEL PRESSURE , PROCEDURE, Fuel. >
  14. Warning lights may illuminate when performing driving test with jacked-up or lifted-up condition, but this is not a system malfunction. The reason for this is the rotating speed difference between the front and rear wheels. After diagnosis of engine control system, perform the VDC memory clear procedure of self-diagnosis function. < Ref. to CLEAR MEMORY MODE . >
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