Toyota Diagnostic Communications Link TDCL

The TDCL is an enhanced diagnostic check connector which adds a special diagnostic TEST mode to the self diagnostic system. It is only used on '89 and later Cressida, '92 and later Camry, and all Lexus models. It is located under the left side of the instrument panel.

The TDCL uses a TE2 test terminal, which when grounded, triggers the special TEST mode. In TEST mode, the ECU is capable of detecting intermittent electrical faults which are difficult to detect in a normal diagnostic mode. The ECU eliminates most code setting conditions when TEST mode is entered, allowing it to immediately detect a malfunction in many of the monitored circuits.

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