Diagnostic Trouble Code Reading Procedure

Diagnostic Trouble Code Reading Procedure Diagnostic trouble code reading with the trouble indicator monitor

If a diagnostic trouble code occurs, a diagnostic trouble code and message will display in the main unit trouble indicator monitor.

When the diagnostic trouble code is in the memory

Accurately follow the specified diagnostic trouble code chart to perform repair.

When there is no diagnostic trouble code

Select the symptom from diagnosis for each symptom.Complete repair according to the diagnosis procedure.Inspection can also be performed referencing function diagnosis.

When there is no applicable symptom

1. Investigate the complaint in detail. 2. Create the diagnosis plan. 3. Use wiring diagrams and operation principles. In similar cases where the repair history can be obtained, request technical support.This will combine technical knowledge with effective use of useful service information.

When the problem is intermittent

Problems that do not necessarily appear all of the time are referred to as intermittent.Follow the steps below to resolve intermittent problems. 1. Confirm the diagnostic trouble code information and data indication. 2. Evaluate symptoms and conditions stated by the customer. 3. Use a check sheet or another method to check circuits or electrical system component parts.

When trouble is not detected

This status indicates that the main unit is judged to be operating normally.The status stated by the customer is sometimes normal operation.The customer's complaint should be checked through comparison with a separate main unit that is operating normally.Depending on the situation, however, the problem is sometimes an intermittent one.Before returning the main unit, the complaint should be checked in the status stated by the customer. 1. Reinvestigate the complaint.

When a complaint cannot be sufficiently detected or confirmed, it is necessary to reperform diagnosis and recheck the complaint.As stated above in "When the problem is intermittent", it is possible that the complaint is either an intermittent problem or normal operation. 2. Perform repair and confirm results.

If the cause has been confirmed, perform repair.Confirm that the main unit operates correctly and confirm that the symptoms have been corrected.This includes main unit confirmation tests and other methods under the following conditions for confirming whether a complaint has been resolved. • Perform a test under the status stated by the customer to check the complaint. • When a diagnostic trouble code is diagnosed, recreate the status in which the diagnostic trouble code was set while checking the scan tool data and confirm whether repair has been done.