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 Methods: Overview
The Diagnostic Methods article provides detailed instructions on how to access or perform routine diagnostic tasks. This article can be referenced for step-by -step instructions for routine procedures.
When performing alternative fuel diagnostics, the system may be checked by an off-board tester referred to as a scan tool. This article contains instructions for performing diagnostics with the scan tool. Specific diagnostic functions may be selected from a displayed menu, otherwise refer to the scan tool operating manual.
Utilize the Bi-Fuel Driveability Diagnostic Form located in REFERENCE VALUES - BI-FUEL CNG to record customer and test data during diagnosis.
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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.