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.
ACTUATOR TEST Mode
This function allows the technician to check operation of output circuits or devices, which PCM cannot detect. DRB allows PCM to activate these outputs or devices, so technician can check for proper operation.
Most tests available in this mode provide an audible or visual indication of device operation (click of relay contacts, fuel spray, etc.). With exception of an intermittent condition, if a device functions properly during its test, it, its wiring and its driver circuit are presumably working properly.
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.