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:

Inspection procedure
Handheld tester: 1 Perform active test by handheld tester(operation of circuit opening relay) Connect the handheld tester to the dlc3.  turn the ignition switch on and push the handheld tester main switch on.  select the item diagnosis / enhanced obd ii / active test / fu ...

Fuel pump shut off system
To minimize the risk of fuel leakage when the engine stalls or when an airbag inflates upon collision, the fuel pump shut off system stops the supply of fuel to the engine. Follow the procedure below to restart the engine after the system is activated. ► Vehicles without a smart key syst ...

Inspection procedure
Hint: 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 ...

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