TAILIEUCHUNG - Automatic Transmissions P18

Diagnostic Procedures | Section 5 Diagnostic Procedures Lesson Objectives 1. Perform all preliminary checks prior to test driving. 2. Relate the importance that verifying the customer concern plays in diagnosis. 3. Explain the types of fluid contaminants. 4. Explain holding device diagnosis based on a time lag test. 5. Perform a thorough test drive for transmission diagnosis. 6. Perform a manual shift test of an ECT transmission vehicle. 7. Access diagnostic codes using the diagnostic tester or flashing O D OFF Light in earlier models. 8. Check line pressure at idle and stall speed. 9. Monitor line pressure during automatic and manual upshift operation. 10. Explain Repair Manual features which assist in diagnosis. Automatic Transmission Diagnosis - Course 273 Section 5 1 -- M Jti s TOYOTA Technical Training Diagnostic Procedures Diagnostic Diagnosis of an automatic transmission requires a logical step by step Procedures procedure that establishes the cause of the problem. The procedure must eliminate as many causes as possible before the transmission is removed. To accomplish this it is as important to determine what is working as it is to determine what is not working. Time spent in diagnosis will help isolate the problem to one of the following engine driveability internal mechanical or friction disc failure hydraulic logic control electronic system failure Many diagnostic clues are no longer available once the transmission is removed and spread out on a bench. Once diagnosis has narrowed the cause determine whether the repair can be done with the transmission in the vehicle or if it needs to be removed. Additionally will it be cost effective to repair the transmission or replace it with a re-manufactured unit Diagnostic Diagnosis of automatic transmission complaints should follow a Sequence systematic sequence of events which resolves the customer s concern. of Events 1. Verify the Customer Complaint Is there enough information 2. Fluid Checks. Ensure the proper level and condition of

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