AUTOMATIC TRANSMISSION — Troubleshooting (Basic Troubleshooting) AT-9 TROUBLESHOOTING Basic Troubleshooting Before troubleshooting an ECT, first determine whether the problem is electrical or mechanical. To do this, just refer to the basic troubleshooting flow-chart provided below. If the cause is already known, using the basic troubleshooting chart below along with the general troubleshooting chart on the following pages should speed the procedure. Read Diagnostic Code (See page AT-14) Bad → Repair or Replace OK ↓ Preliminary Check (See page AT-19) Bad → Repair or Replace OK ↓ Manual Shifting Test (See page AT-21) OK → Bad ↓ ↓ OK ← Stall Test, Time Lag Test and Hydraulic Test ↓ Bad ↓ Electrical Control System Check Repair Transmission ↓ Repair or Replace