Transmission Control
INTRODUCTION TO A/T DIAGNOSISThe automatic transaxle can exhibit any of the following symptoms: noise or vibration is generated, A/T fluid leaks, the vehicle does not move forward or backward.
The causes of these symptoms could come from: Incorrect mounting, the A/T fluid may be low, or a component of the transaxle may be faulty. The following items are suspected as causes for the INVECS-II troubles: malfunctions of the PCM, the sensor, the switches, the harness or connectors.
A/T DIAGNOSTIC TROUBLESHOOTING STRATEGY
Use these steps to plan your diagnostic strategy. If you follow them carefully, you will find most A/T faults.
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 DTC, the malfunction is intermittent. For information on how to cope with intermittent malfunctions, refer to INTRODUCTION, How to Use Troubleshooting/inspection Service Points How to Cope with Intermittent Malfunction PA.
5. If you can verify the condition but there are no DTC, or the system cannot communicate with the scan tool, refer to the Symptom Chart.
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 Inspection Chart for Diagnostic Trouble Codes.
9. If DTC is not set again, the malfunction is intermittent. For information on how to cope with intermittent malfunctions, refer to INTRODUCTION, How to Use Troubleshooting/ Inspection Service Points - How to Cope with Intermittent Malfunction PA.
10. After repairs are completed, conduct a Road Test duplicating the complaint set conditions to confirm the malfunction has been eliminated.