Corolla LE Sedan L4-1.8L (1ZZ-FE) (1999)
Data Link Connector: Testing and Inspection
DLC3 INSPECTION
The vehicle's ECM uses ISO 9141-2 for communication. The terminal arrangement of DLC3 complies with SAE J1962 and matches the ISO 9141-2
format.
HINT: It your display shows "UNABLE TO CONNECT TO VEHICLE" when you have connected the cable of the OBD II scan tool or TOYOTA
hand-held tester to DLC3, turned the ignition switch ON and operated the scan tool, there is a problem on the vehicle side or tool side.
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If communication is normal when the tool is connected to another vehicle, inspect DLC3 on the original vehicle.
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If communication is still not possible when the tool is connected to another vehicle, the problem is probably in the tool itself.