TD20 - Visually Check Harness Between EEC-IV and Transmission

- Visually check Transmission Range switch and shift solenoid wires between Powertrain Control Module and transmission.

- Do Transmission Range switch and shift solenoid wires appear OK?

Yes -- Go to TD21. TD21 - Check Harness and Connectors For Intermittent Problems

No -- Service as necessary. Re-evaluate symptom.