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.
Diagnostic System Operation: Notes
The ECM of the DFI control system has a built-in diagnostic capability to constantly monitor engine/vehicle performance and operation. The diagnostic system consists of 4 tests: Engine malfunction tests, switch tests, engine data displays and output cycling tests. When diagnosing DFI system, always perform tests in the order described to determine system failures in the shortest amount of time. Description of each test is as follows:
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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.