Initial Inspection and Diagnostic Overview

DESCRIPTION
The on-board diagnosis system integrated in the transmission control module diagnoses malfunctions of the main sensors (input) and solenoid valves (output) and the transmission control module itself. Malfunctions or intermittent malfunctions are memorized in the transmission control module to later be output as diagnostic trouble codes.
The Self-Diagnosis Checker can be used to retrieve these diagnostic trouble codes. The Self-Diagnosis Checker indicates a malfunction by displaying a code and sounding a buzzer.
When the TAT and GND terminals of the data link connector are shorted with the ignition switch ON, the transmission control module outputs any memorized diagnostic trouble codes by flashing the HOLD indicator light.