Troubleshooting Flow, Strategy and Guidelines

Diagnostic Troubleshooting Flow:

NOTE: If a DTC is erased, its "freeze frame" data will be also erased and the readiness test status will be reset. Store the "freeze frame" data before erasing the DTC.

Use these Steps to plan your diagnostic strategy. If you follow them carefully, you will be sure to have exhausted most of the possible ways to find an MFI fault.

Troubleshooting Guidelines / Strategy

1. Gather as much information as possible about the complaint from the customer.Customer Check Sheet
2. Verify that the condition described by the customer exists.
3. Check the vehicle for any MFI Diagnostic Trouble Code (DTC).Reading Diagnostic Trouble Codes
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 How to Use Troubleshooting/Inspection Service Points - How to cope with Intermittent Malfunction.How to Cope With Intermittent Malfunctions
5. If you can verify the condition but there are no DTCs, or the system cannot communicate with the scan tool, refer to the trouble symptom classification table.Symptom Related Diagnostic Procedures
6. If there is a DTC, record the number of the code, then erase the code from the memory using the scan tool.Clearing Diagnostic Trouble Codes
7. Reconfirm the malfunction symptom and carry out a test drive with the drive cycle pattern.
8. If DTC is set again, carry out an inspection with the diagnostic trouble code procedures of that code.
9. If DTC is not set again, the malfunction is intermittent. For information on how to cope with intermittent malfunctions, refer to How to Use Troubleshooting/Inspection Service Points - How to cope with Intermittent Malfunction.How to Cope With Intermittent Malfunctions
10. After repairs are completed, conduct a road test duplicating the complaint set conditions to confirm the malfunction has been connected.

NOTE: If the powertrain control module (PCM) is replaced, Immobilizer Encrypted Code Registration should be carried out. Refer to Ignition Switch - On-vehicles Service - Immobilizer Encrypted Code Registration.