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Engine Controls (Diagnostics): 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.
  3. Do not disconnect the battery terminals 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.
  4. 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. Refer to CLEAR MEMORY MODE 
  5. When measuring the voltage or resistance of individual sensor or all electrical control modules, use a tapered pin with a diameter of less than 0.6 mm (0.024 in). Do not insert the pin 4 mm (0.16 in) or more into the part.
    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 procedures, refer to "REGISTRATION MANUAL FOR IMMOBILIZER".
  6. 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.
  7. Use ECM mounting stud bolts for the grounding point when measuring voltage and resistance inside the passenger compartment.
    Fig 1: Identifying ECM Mounting Stud Bolt
    G08544598Courtesy of SUBARU OF AMERICA, INC.
  8. Use the engine ground terminal or engine assembly for the grounding point when measuring the voltage and resistance in engine compartment.
    Fig 2: Locating Engine Ground Terminal
    G06647978Courtesy of SUBARU OF AMERICA, INC.
  9. 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.
  10. Observe the following cautions when installing a radio in vehicle.
    CAUTION:
    • The antenna must be kept as far apart as possible from the ECM. Refer 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.
  11. When disconnecting the fuel hose, release the fuel pressure. Refer to RELEASING OF FUEL PRESSURE , PROCEDURE, Fuel.
  12. 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. When engine control system diagnosis is finished, perform the VDC memory clearance procedure of self-diagnosis function. Refer to CLEAR MEMORY MODE .
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