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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

Using Toyota hand-held tester or scan tool, retrieve Diagnostic Trouble Codes (DTC) from Engine Control Module (ECM) and record any freeze frame data (if applicable). See RETRIEVING DIAGNOSTIC TROUBLE CODES .

Clear Diagnostic Trouble Codes

Using Toyota hand-held tester or scan tool, clear DTCs and freeze frame data from ECM. See CLEARING DIAGNOSTIC TROUBLE CODES .

Visual Inspection

Inspect all electrical connectors and wiring for suspected circuit or component. Ensure all electrical connections are clean and tight.

Confirm Symptoms & Diagnostic Trouble Codes

Perform road test. Determine if original symptoms still exist. Using scan tool or Toyota hand-held tester, retrieve DTCs from ECM. See RETRIEVING DIAGNOSTIC TROUBLE CODES .

Diagnose & Repair Diagnostic Trouble Codes

Perform appropriate DTC test listed under DIAGNOSTIC TESTS as necessary. For DTC descriptions, see DIAGNOSTIC TROUBLE CODE DEFINITIONS table under DIAGNOSTIC TROUBLE CODE DEFINITIONS. If no DTCs are present and a driveability condition exists, proceed to TROUBLE SHOOTING - NO CODES article for diagnosis by symptom (i.e., ROUGH IDLE, ENGINE STALLS, etc.).

Verification Procedure

After repairs have been completed, clear all DTCs from ECM. See CLEARING DIAGNOSTIC TROUBLE CODES . Perform road test. Ensure no DTCs exist and all symptoms and/or complaints have been repaired. Ensure no DTCs are present and all symptoms and/or complaints have been repaired.