Introduction to Diagnosis

INTRODUCTION TO A/T DIAGNOSIS
The mounting could be incorrect, the A/T fluid may be low, or a component of the transaxle may be faulty in the following conditions: noise or vibration is generated, A/T fluid leaks, the vehicle does not move forward or backward.

A/T DIAGNOSTIC TROUBLESHOOTING STRATEGY
Use these steps to plan your diagnostic strategy. If you follow them carefully, you will be sure that you have exhausted most of the possible ways to find an A/T fault.
1. Gather as much information as possible about the complaint from the customer.
2. Verify that the condition described by the customer exists.
3. Check the vehicle for any A/T Diagnostic Trouble Code (DTC).
4. If you cannot verify the condition and there are no DTCs, the malfunction is intermittent. For information on how to cope with intermittent malfunctions, refer to "General Electrical Troubleshooting".
5. If you can verify the condition but there are no DTCs, or the system cannot communicate with the scan tool, refer to the Symptom Chart under "Diagnosis By Symptom".
6. If there is a DTC, record the number of the code, then erase the code from memory using the scan tool.
7. Reconfirm the symptom using the Road Test.
8. If DTC is set again, go to the diagnostic trouble code charts.
9. If DTC is not set again, the malfunction is intermittent. For information on how to cope with intermittent malfunctions, refer to "General Electrical Troubleshooting".
10. After repairs are completed, conduct a Road Test duplicating the complaint set conditions to confirm the malfunction has been eliminated.

NOTE: (Only for 2000 models). If the PCM is replaced, the immobilizer-ECU should be replaced together with it.
Each PCM has an encrypted code for the immobilizer-ECU, and the encrypted code is registered in the immobilizer-ECU.

NOTE: For additional information about the on-board self-diagnosis system, refer to Computers and Control Systems.