Toyota Tacoma manuals

Toyota Corolla Repair Manual: 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

Check short circuit
If the wire harness is ground shorted as shown in fig. 5, Locate the section by conducting a resistance check with the body ground in step (b). Check the resistance with the body grou ...

Terms
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Other materials:

Out side moulding
Replacement Hint: use the same procedures for the rh side and lh side. 1. Remove outside moulding Put protective tape around the moulding.  insert a piano wire between the vehicle body and moulding.  tie objects that can serve as handles (for example, wooden blocks) to all ...

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 malf ...

Inspection procedure
1 Inspect stop lamp switch assy 2 Check harness and connector(stop lamp switch assy Ц ecm)   Install the stop lamp switch assy.  disconnect the ecm connector.  measure the voltage according to the value(s) in the table below when the brake pedal is depressed and releas ...

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