Testing Sequence

NOTE: To locate problems with the 4EAT, the following sequence should be followed:

1. Perform Inspection and Verification
This step will help to find possible problems that are obvious, easy to check, and easy to repair.

2. Perform Quick Test
This test checks the Powertrain Control Module (PCM) for diagnostic trouble codes related to electronic failures within the automatic transaxle. Refer to EEC-IV Quick Test Procedures under the Powertrain Management/Computer and Control Systems. For a summary of the 4EAT Automatic Transaxle Repair Process, refer to Flow of Diagnosis flow chart.


3. Perform System Inspection
This test checks the automatic transaxle for proper mechanical operation.

4. Review Symptom Chart
This step provides basic direction for test procedures. The Symptom Chart only covers problems that are easy to relate to a customer complaint. More detailed symptoms are covered in the Road Test section of the Diagnosis and Testing procedures to isolate problems found while driving, or for problems that need specific analysis. Follow the directions given in the "Action to Take" column. Directions are given in the recommended order of testing.

5. Perform Operational Tests
This step determines the causes of most basic problems that may exist. Follow the directions to repair any faults. When directed to perform Operational Tests and a Road Test for the same symptom, always perform the Operational Tests first; this will prevent possible damage to the automatic transaxle during driving.

6. Perform Road Test
This test evaluates the driveability of the 4EAT automatic transaxle. The results of the test may require major disassembly, therefore this test should always be performed last. During the test, the powertrain may also show problems that can cause the transaxle to malfunction, or be confused with transaxle problems. If no problems are found during the test, it is likely that the problem is intermittent. Since the problem may not reoccur, the symptom should be evaluated with the customer present.

NOTES: After any repair is made, test the automatic transaxle again to check if the symptom is still present. If the symptom reoccurs, further testing must be performed to isolate the problem. Whenever fluid is drained from the automatic transaxle, be certain the proper type and amount of fluid is replaced.

Engine problems or driveline problems 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.