Tundra 2WD V6-3.4L (5VZ-FE) (2004)
Data Link Connector, A/T: Description and Operation
Inspect the DLC3
The vehicle's ECM uses ISO 9141-2 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the
ISO 9141-2 format.
HINT:
Connect the cable of the OBD II scan tool of the hand-held tester to the DLC3, turn the ignition switch ON and attempt to use the OBD II scan tool or
the hand-held tester If the screen displays UNABLE TO CONNECT TO VEHICLE, a problem exists in the vehicle side or the tester side.
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If communication is normal when the scan tool or the hand-held tester is connected to another vehicle, inspect the DLC3 on the original vehicle.
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If communication is still impossible when the scan tool or the hand-held tester is connected to another vehicle, the problem is probably in the scan
tool or the hand-held tester itself. Consult the Service Department listed in the tester's instruction manual.