Flow of Diagnosis

Figure 1:

This diagnostic procedure is to be used on Electronically Controlled Automatic Transaxle (4EAT) equipped vehicles only.

To help locate problems with the transaxle, the following sequence should be followed, (except when directed otherwise by the symptom menu):
1. Perform Preliminary Inspection. This step will help find possible problems that are obvious, easy to check, and easy to repair.
2. Review 4EAT Symptom Menu. This step provides basic direction or test procedures. The 4EAT symptom menu only covers problems that are easy to relate to a Customer complaint. More detailed symptoms are covered in the Operational and the Road Tests of the Diagnostic Charts 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 a recommended order of testing, but if experience or previous knowledge of the symptom exists, any order can be followed, if the symptom is not in the menu, continue to the third step.
3. Perform 4EAT Quick Test. This step will find fault codes that may indicate 4EAT input or output device failure. Follow the Diagnostic Charts-Pinpoint Test Step direction given in the Quick Test before continuing with the procedure. When directed to perform Quick Test, Diagnostic Charts-Operational Tests and Road Test for the same symptom, ALWAYS perform Quick Test first.
4. Perform Diagnostic Charts-Operational Tests. This step determines the causes of most basic problems that may exist. Follow the directions given to repair any faults. When directed to perform Diagnostic Charts-Operational Tests and Road Test for the same symptom ALWAYS perform Operational Tests first; this action will prevent causing possible damage to the transaxle during driving.
5. Perform Diagnostic Charts-Road Test. This step isolates problems that are evident during driving. The Road Test is an evaluation of the 4EAT while driving; service or inspection of the transaxle during this test may involve major disassembly, therefore the Diagnostic Charts-Road Test should ALWAYS be done last. The powertrain may also show problems during the Road Test that can cause transaxle malfunction, or be confused with transaxle problems. If no problems are found during Road Test it is likely that the problem is intermittent. Since the problem may not re-occur, the symptom should be evaluated with the Customer present.

NOTE: After any repair is made, re-test the transaxle to verify if the symptom is still present. If the symptom re-occurs, further testing must be performed to isolate problem. Any time 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.

NOTE; Always make sure proper safety precautions are used when performing all tests and repairs.

If a problem or complaint keeps occurring, the Customer should be asked to demonstrate the problem. Then the symptom can be narrowed down, and any improper operation by the Driver can be corrected.