Pinpoint Test Instructions

- Begin with non-transmission related DTCs, then service any transmission related DTCs. Refer to the EEC-IV On-Board Diagnostic Trouble Code Description Chart for information on Condition and Symptoms. This chart will be helpful to aid in diagnosing internal transmission concerns and external non-transmission inputs.

- The Pinpoint Tests are used in diagnosing electrical concerns of the E4OD transmission. Make sure that the vehicle wiring harness and the PCM are diagnosed as well.

- The vehicle wiring harness, PCM and non-transmission sensors may affect transmission operations. Service these concerns first.

- Prior to entering Pinpoint Tests, check the PCM wiring harness for proper connections, bent or broken pins, corrosion, loose wires, proper routing, proper seals and their condition. Check the PCM, sensors and actuators for damage.

- If DTCs appear while performing the On-Board Diagnostics refer to the EEC-IV On-Board Diagnostic Trouble Code Description Chart for the appropriate service procedure.

- Prior to entering Pinpoint Tests, refer to any TSBs for E4OD transmission concerns.

- After Electrical Diagnosis has been performed and a concern still exists, refer to the Electrical/Hydraulic/Mechanical Diagnosis charts.