Toyota Corolla (E120): Inspection procedure

Hint

:

  • if different dtcs related to different systems that have terminal e2 as the ground terminal are output simultaneously, terminal e2 may be open.
  • Read freeze frame data using the hand-held tester or the obd ii scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air–fuel ratio was lean or rich, etc. At the time of the malfunction.

1 Inspect heated oxygen sensor(heater resistance)

  1. Disconnect the h5 or h8 heated oxygen sensor connector.
  2.  measure the resistance between the terminals of the heated oxygen sensor connector.

Standard:

Standard:

  1. Reconnect the heated oxygen sensor connector.

2 Inspect efi relay

2 Inspect efi relay

  1. Remove the efi relay from the engine room r/b.
  2.  check for continuity in the efi relay.

Standard:

Standard:

  1. Reinstall the efi relay.

3 Inspect ecm(ht1a or ht1b voltage)

3 Inspect ecm(ht1a or ht1b voltage)

  1. Turn the ignition switch on.
  2.  measure the voltage between the applicable terminals of the e4 and e5 ecm connectors.

Standard:

Standard:

4 Check harness and connector(heated oxygen sensor – ecm,

4 Check harness and connector(heated oxygen sensor – ecm, heated oxygen sensor – efi relay)

  1. Check the harness and connector between the ecm and heated oxygen sensor connectors.
  1.  Disconnect the h5 or h8 heated oxygen sensor connector.
  2.  Disconnect the e4 or e5 ecm connector.
  3.  Check the resistance between the wire harness side connectors.

Standard (check for open):

Standard (check for open):

Standard (check for short):

Standard (check for short):

  1. Reconnect the heated oxygen sensor connector.
  2.  Reconnect the ecm connector.
  1.  check the harness and connector between the heated oxygen sensor connector and efi relay.
  1.  Disconnect the h5 or h8 heated oxygen sensor connector.
  2.  Remove the efi relay from the engine room r/b.
  3.  Check the resistance between the wire harness side connectors.

Standard (check for open):

Standard (check for open):

Standard (check for short):

Standard (check for short):

  1. Reconnect the heated oxygen sensor connector.
  2.  Reinstall the efi relay.

Replace ecm

Replace ecm

    Share this page:

    Other materials:

    Other functions
    ■ Switching between outside air and recirculated air modes Press . The mode switches between outside air mode (indicator off) and recirculated air mode (indicator on) each time is pressed. ■ Defogging the windshield Defoggers are used to defog the windshield and front side windows ...

    Seat belts
    Make sure that all occupants are wearing their seat belts before driving the vehicle. WARNING Observe the following precautions to reduce the risk of injury in the event of sudden braking, sudden swerving or an accident. Failure to do so may cause death or serious injury. ■Wearing a seat belt E ...

    AHB (Automatic High Beam)
    The Automatic High Beam uses a front camera located on the upper portion of the windshield to detect the brightness of the lights of vehicles ahead, streetlights, etc., and automatically changes the head lights between the high beams and low beams. WARNING ■For safe use Do not overly rely on the A ...