Flow of Diagnosis
REQUIRED EQUIPMENTThe following equipment is required to accurately diagnose the 4EAT:
- Rotunda 73 Digital Multimeter 105-R0051
- Rotunda Automatic Transmission Tester Kit 014-00737
- Rotunda 88 Digital Multimeter 105-R0053
- Rotunda New Generation Star (NGS) tester 007-00500
PROCEDURE
To help locate problems with the automatic transaxle, the following sequence should be followed:
1. Perform Inspection and Verification. This step will help find possible problems that are obvious, easy to check, and easy to repair. Initial Inspection and Diagnostic Overview
2. Perform quick Test. This test checks the Powertrain Control Module (PCM) for diagnostic trouble codes related to electronic failures within the automatic transaxle.
3. Review Symptom Chart. This step provides basic direction for test procedures. The Symptom Chart only covers conditions that are easy to relate to a customer complaint. More detailed symptoms are covered in the Operation Tests and Road Test procedures, to isolate problems found while driving or for problems that need specific analysis. Follow the direction given in the "Action to Take" column. Directions are given in recommended order of testing. Symptom Related Diagnostic Procedures
4. Perform Operational Tests. This test determines the causes of most basic problems that may exist. Follow the directions given to repair any faults. When directed to perform Operational Tests and Road Test for the same symptom, always perform Operational Tests first; this action will prevent causing possible damage to the automatic transaxle during driving.
5. Perform Road Test. This test is an evaluation of the automatic transaxle while driving. Service or inspection of the automatic transaxle as a result of this test may involve major disassembly; therefore, the Road Test should always be done last. The power train may also show conditions during the Road Test that can cause automatic transaxle malfunction, or be confused with automatic transaxle conditions. If no conditions are found during this test, the condition might be intermittent. Since the condition may not recur, the symptom should be evaluated with the customer present.
6. Re-Test.
- After any repair is made, re-test the automatic transaxle to verify if the symptom is still present. If the symptom recurs, further testing must be performed to isolate the condition. Any time fluid is drained from the automatic transaxle, be certain the proper type and amount of fluid is replaced.
- Engine concerns or drive line concerns can affect automatic transaxle performance therefore, other systems may have to be serviced before the automatic transaxle, such as the engine or front wheel driveshaft and joints.
DIAGNOSIS FLOW CHART
The Diagnosis Flow Chart gives a general overview of the 4EAT automatic transaxle repair process. It should not be used to replace any procedures; rather, it should be used to see how different stages of the repair process relate.