Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Engine Controls - Self-Diagnostics - TRIONIC Fuel Control System: Testing: Notes
The following check list of procedures is suggested to be followed to ensure correct diagnosis and repair:
- 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 (DTC)
Connect appropriate scan tool. Retrieve DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES (DTCs). - Clear DTCs
Clear DTCs. See CLEARING DTC . - Visual Inspection
Inspect all connectors of suspect circuit or component. Ensure all connections are clean and tight. - Confirm Symptoms & DTCs
Perform road test. Determine if original symptoms are still present. Retrieve DTCs. - Diagnose & Repair DTCs
Perform diagnosis and repair procedures as needed. See applicable SYSTEM CHECKS. If no codes are present, proceed to TESTS W/O CODES article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.). - Confirmation Procedure
After repairs have been completed, clear all DTCs. See CLEARING DTC . Perform road test. Confirm that no DTCs are present and all symptoms and/or complaints have been repaired.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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