Testing Procedure
WARNING: This page is about a different car, the 1997 Lexus SC 400. However, it is still accessible from the selected car via links, so may be relevant.
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 OBD-II scan tool. Retrieve codes and record any freeze-frame data. See RETRIEVING DIAGNOSTIC TROUBLE CODES.
- Clear Trouble Codes Clear codes using scan tool. See CLEARING DIAGNOSTIC TROUBLE CODES.
- Perform 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 codes.
- Diagnose & Repair Diagnostic Trouble Codes Perform diagnosis and repair procedures as needed. If no codes are present, proceed to TESTS W/O 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 codes are present and all symptoms and/or complaints have been repaired.