Testing Procedure
WARNING: This page is about a different car, the 1995 Lexus LS 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 Trouble Codes Connect appropriate OBD-II scan tester. Retrieve codes and record any freeze-frame data. See RETRIEVING TROUBLE CODES .
- Clear Trouble Codes Clear codes using scan tester. See CLEARING 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 codes.
- Diagnose & Repair Trouble Codes Perform diagnosis and repair procedures as needed. See appropriate DIAGNOSTIC TESTING. 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 trouble codes. See CLEARING TROUBLE CODES . Perform road test. Ensure no trouble codes are present and all symptoms and/or complaints have been repaired.