Tundra 4WD V8-4.7L (2UZ-FE) (2003)
Data Link Connector, A/T: Description and Operation
Inspect the DLC3
The vehicle's ECM uses the V.P.W. (Variable Pulse Width) for communication to comply with the SAE J1850. The terminal arrangement of the DLC3
complies with the SAE J1962 and matches the V.P.W. format.
HINT: If the display shows "UNABLE TO CONNECT TO VEHICLE" when you have connected the cable of the scan tool (OBD II scan tool or
hand-held tester) to the DLC3, turned the ignition switch ON and operated the scan tool, there is a problem on the vehicle side or the scan tool side.
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If the communication is normal when the scan tool is connected to another vehicle, inspect the DLC3 on the original vehicle.
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If the communication is still impossible when the scan tool is connected to another vehicle, the problem is probably in the scan tool itself, so
consult the Service Department listed in the scan tool's instruction manual.