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Home >> Lexus >> 2002 >> ES 300 >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Diagnosis - U150E >> Trouble Shooting >> Introduction

Trouble Shooting: Introduction

NOTE: For circuit reference, see CONNECTOR IDENTIFICATION  and/or WIRING DIAGRAMS  .

Any diagnosis should begin with confirming the customer's complaint. If possible, road test vehicle first, and note transaxle performance for future reference during diagnosis. When trouble shooting transaxle, perform PRELIMINARY INSPECTION  first, then check for stored DTCs and repair as necessary. If no DTCs exist, perform manual shift test to determine if problem area is an electrical circuit or a mechanical transaxle problem. See MANUAL SHIFT TEST  under PERFORMANCE TESTS.