Toyota Corolla (E120): Source voltage drop

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Engine (ignition) switch (vehicles with a smart key system)
Performing the following operations when carrying the electronic key on your person starts the engine or changes engine switch modes. Starting the engine 1. Check that the parking brake is set. 2. Check that the shift lever is in P. 3. Firmly depress the brake pedal. and a message will be display ...

How to proceed with troubleshooting
The hand–held tester can be used at step 3, 4, 6, 9. 1 Vehicle brought to workshop 2 Customer problem analysis 3 Connect the obd ii scan tool or hand–held tester to dlc3 4 Check and clear dtc and freeze frame data 5 Visual inspection 6 Setting the check mode diagnosis 7 Proble ...

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