Flow of Diagnosis

TROUBLESHOOTING

STANDARD FLOW OF DIAGNOSTIC TROUBLESHOOTING





Malfunctions of the 4 A/T system can be caused by malfunctions or incorrect adjustments of the electronic control system, hydraulic control system or A/T system or a combination of these.
Carry out troubleshooting by the following procedure in order to make effective diagnoses.
1. Get a full understanding of the conditions under which the trouble symptoms that the customer is complaining about occur, including frequency of occurrence.
2. Use the scan tool to read and make a note of the diagnostic trouble codes (including fail-safe codes).
3. Erase the diagnostic trouble codes in order to carry out a road test.
4. Carry out adjustment of the basic inspection items (ATF, TPS, park/neutral position switch, throttle cable, etc.).
5. Carry out a road test. Be sure to check that the basic inspection items and all diagnostic trouble codes and conditions of reoccurrence are covered during this test.
6. Check that the diagnostic trouble codes which were read before the road test (in step (2) above) are present.
7. Determine the probable cause from the Chart Classified by Diagnostic Trouble Codes.
8. Determine the probable cause from the Chart Classified by Trouble Symptoms.
9. Carry out a intermittent malfunction simulation test. (Refer to GROUP 00 - How To Use Troubleshooting/Inspection Service Points.)
10. After repairs are completed, carry out a road test to check that the malfunction has been repaired.