Non-Trouble Code Procedures

After On-Board Diagnostics

NOTE: The vehicle wiring harness, Powertrain Control Module (PCM) and non-transmission sensors can affect transmission operations. Repair these concerns first.

After the On-Board Diagnostics procedures are completed, repair all DTCs.

Always repair all non-transmission-related DTCs first, then repair any transmission-related DTCs. Refer to the Diagnostic Trouble Code Chart for information on condition and symptoms. This chart will be helpful in referring to the correct manual(s) and to aid in diagnosing internal transmission concerns and external non-transmission inputs. The pinpoint tests are used in diagnosing electrical concerns of the transmission. Make sure the vehicle wiring harness and the PCM are diagnosed as well. Refering to Computers and Control Systems will aid in diagnosing non-transmission-related electronic components.