How to Use the Flow of Diagnosis

Flow Of Diagnosis For ECU Controlled Systems:

Carry out troubleshooting in accordance with the procedures outlined under this heading. Here, only the basic procedure is shown. Details are provided under each component or system, showing the most effective methods for each circuit. Confirm the troubleshooting procedures first for the relevant circuit before beginning troubleshooting of that circuit.

[1]
Ask the customer about the conditions and the environment when the problem occurred.

[2] [3]
Confirm the symptoms and the problem conditions, and check the diagnostic trouble codes. (When the problem symptoms do not appear during confirmation, use the symptom simulation method described later on.)

[4] [5] [6]
Check the results obtained in Step 2, then confirm the inspection procedure for the system or the part which should be checked using the diagnostic trouble code chart or the "Matrix Chart Of Problem Symptoms" under Diagnosis By Symptom.

[7]
Check and repair the affected system or part in accordance with the instructions in Step 6.

[8]
After completing repairs, confirm that the problem has been eliminated.(If the problem is not reproduced, perform the confirmation test under the same conditions and in the same environment as when it occurred for the first time.)