Toyota Corolla (E120): Check and replace ecu

Notice

: start an inspection of the connector from the backside of the connector on the wire harness side with the connector connected to the ecu.

When no measurement condition is specified, perform the inspection with the engine stopped and also the ignition switch on.

  1. First check the ecu ground circuit. If it is faulty, repair it.

    If it is normal, the ecu could be faulty. In this case, replace the ecu with one that functions normally and check if the symptoms appear.

  1.  Measure the resistance between the ecu ground terminal and body ground.

    Resistance: 1 Ω or less

  1. Disconnect the ecu connector, check the ground terminals on the ecu side and wire harness side for bends and check the contact pressure.

Terms

    Share this page:

    Other materials:

    Handling of hose clamps
    Before removing the hose, check the depth of the inserting portion and the clamp position in order to restore it surely.  change a deformed or dented clamp for a new one.  in case of reusing the hose, install the clamp on the hose where it has a clamp track.  for a ...

    Front seats
    Adjustment procedure ► Manual seat 1 Seat position adjustment lever 2 Seatback angle adjustment lever 3 Vertical height adjustment lever (driver’s side only) ► Power seat (driver’s side only) 1 Seat position adjustment switch 2 Seatback angle adjustment switch 3 Seat cush ...

    Overhaul
    1. Remove cylinder block water drain cock sub–assy Remove the cylinder block water drain cock from the cylinder block. 2. Inspect connecting rod thrust clearance Using a dial indicator, measure the thrust clearance while moving the connecting rod back and forth. Standard t ...