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.
Accessing Output Test Mode
To access output test mode using scan tool, perform the following:
- Perform necessary vehicle preparation and visual inspections.
- Connect scan tool to Data Link Connector (DLC).
- Turn ignition on.
- Select NEW VEHICLE YEAR & MODEL.
- Select year, engine, model and any additional information requested by scan tool.
- Select DIAGNOSTIC DATA LINK.
- Select PCM-POWERTRAIN CTRL MODULE.
- Select ACTIVE COMMAND MODES.
- Follow operating instructions from scan tool menu.
- Select mode (i.e., HIGH SPEED FAN or LOW SPEED FAN).
- Select menu option to turn outputs ON (may link up to PIDs).
- Select menu option to turn outputs OFF.
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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