Testing Sequence

4EAT DIAGNOSTIC SEQUENCE

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 transaxle. Refer to Powertrain/Computer Controls Quick Test Procedures For a summary of the 4EAT Transaxle Repair Process, refer to the Flow of Diagnosis flowchart.

3. Perform Switch Monitor Test
This test checks input signals from the individual input switches to the powertrain control module.

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

5. Review Symptom Charts
This step provides basic direction for test procedures. The Symptom Charts only cover problems that are easy to relate to a customer complaint. Follow the directions given in the "Action to Take" column. Directions are given in the recommended order of testing. More detailed symptoms are covered in the operational tests and the road test to isolate problems found while driving or for problems that need specific analysis.

6. 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 transaxle during driving.

7. Perform Road Test
This test evaluates the driveability of the 4EAT 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 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 transaxle, be certain the proper type and amount of fluid is replaced.

Engine problems or driveline problems can affect transaxle performance; therefore, other systems may have to be serviced before the transaxle, such as the engine or halfshafts.

The 4EAT diagnostic procedure consists of a preliminary inspection for obvious defects and a Quick Test for diagnostic trouble codes (6 total), Pinpoint Tests or operational tests performed in a logical sequence, and post operational tests it required.