Description of On-Board Diagnostics

Description:

DESCRIPTION
The transmission control module (integrated with the engine control unit) has a self-diagnosis function that diagnoses malfunctions of the main sensors (input), solenoid valves (output), and the transmission control module. When inspecting for service code(s) memorized in the transmission control module, follow the procedure in How to Display and Read Diagnostic Trouble Codes and read codes off of the HOLD indicator lamp.

If there is more than one failure present, the code numbers will be indicated in numerical order, lowest number first.

After repairing a problem, turn the ignition switch OFF and disconnect the negative battery cable for at least 20 seconds. This erases the service code numbers from the transmission control module.