Testing Procedure

To ensure correct diagnosis and repair, testing should be done in the following sequence:

• 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
  
  Connect appropriate scan tool to Data Link Connector No. 3. See Figure. Retrieve diagnostic trouble codes and record any freeze frame data (if applicable). See RETRIEVING DIAGNOSTIC TROUBLE CODES .
• Clear Trouble Codes
  
  Clear diagnostic trouble codes and freeze frame data. See CLEARING DIAGNOSTIC TROUBLE CODES .
• Visual Inspection
  
  Inspect all connectors of suspect circuit or component. Ensure all connections are clean and tight.
• Confirm Symptoms & Trouble Codes
  
  Perform road test. Determine if original symptoms are still present. Retrieve diagnostic trouble codes. See RETRIEVING DIAGNOSTIC TROUBLE CODES .
• Diagnose & Repair Diagnostic Trouble Codes
  
  Perform diagnosis and repair procedures under DIAGNOSTIC TESTS  as necessary. For DTC descriptions, see DIAGNOSTIC TROUBLE CODE DEFINITIONS  table under DIAGNOSTIC TROUBLE CODE DEFINITIONS. If no diagnostic trouble codes are present, proceed to TROUBLE SHOOTING - NO CODES article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.).
• Verification Procedure
  
  After repairs have been completed, clear all diagnostic trouble codes. See CLEARING DIAGNOSTIC TROUBLE CODES . Perform road test. Ensure no diagnostic trouble codes are present and all symptoms and/or complaints have been repaired.