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6E–37 TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS Diagnosis Strategy-Based Diagnostics Strategy-Based Diagnostics The strategy-based diagnostic is a uniform approach to 1. Verify the customer complaint. D To verify the customer complaint, the technician 2. Perform preliminary checks. D Conduct a thorough visual inspection. D Review the service history. D Detect unusual sounds or odors. D Gather diagnostic trouble code information to 3. Check bulletins and other service information. D This includes videos, newsletters, etc. 4. Refer to service information (manual) system check(s). D “System checks” contain information on a system 5. Refer to service diagnostics. DTC Stored Follow the designated DTC chart exactly to make an No DTC Select the symptom from the symptom tables. Follow the No Matching Symptom 1. Analyze the complaint. operation. Combine technician knowledge with efficient use of the Intermittents Conditions that are not always present are called 1. Observe history DTCs, DTC modes, and freeze frame data. 2. Evaluate the symptoms and the conditions described by the customer. 3. Use a check sheet or other method to identify the circuit or electrical system component. 4. Follow the suggestions for intermittent diagnosis found in the service documentation. Most Scan Tools, such as the Tech 2, have data-capturing No Trouble Found This condition exists when the vehicle is found to operate 1. Re-examine the complaint. When the Complaint cannot be successfully found or Intermittents section, or could be normal. 2. Repair and verify. After isolating the cause, the repairs should be made. D Conditions noted by the customer. D If a DTC was diagnosed, verify a repair by Verifying Vehicle Repair Verification of the vehicle repair will be more IMPORTANT: Follow the steps below when you verify repairs on OBD II systems. Failure to follow these steps 1. Review and record the Failure Records and the Freeze Frame data for the DTC which has been 2. Clear the DTC(S). Failure Records and Freeze Frame data. 4. Monitor the DTC status information for the DTC which has been diagnosed until the diagnostic test |