* Please Read First *

The following check list of procedures is suggested to be followed to ensure correct diagnosis and repair:

• Record Customer Complaint  - Ensure all customer complaints or observations are recorded. Test drive vehicle with customer when necessary for malfunction verification.
• Retrieve Diagnostic Trouble Codes (DTCs)  - Connect appropriate scan tool. Retrieve all DTCs. Refer to RETRIEVING DIAGNOSTIC TROUBLE CODES  .
• Clear DTCs  - Clear DTCs. See CLEARING  DTCs.
• Visual Inspection  - Inspect all connectors of suspect circuit or component. Ensure all connections are clean and tight.
• Confirm Symptoms & DTCs  - Perform road test. Determine if original symptoms are still present. Retrieve DTCs.
• Diagnose & Repair DTCs  - Perform diagnosis and repair procedures as needed. See appropriate DIAGNOSTIC TESTS  . If no codes are present, proceed to TESTS W/O CODES article in this section for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.).
• Confirmation Procedure  - After repairs have been completed, clear all DTCs. See CLEARING  DTCs. Perform road test. Confirm that no DTCs are present and all symptoms and/or complaints have been repaired.