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.
Selecting Test Mode
The following test modes are available for diagnosing ABS:
- Mode F0 (Data List)
Mode continuously displays the actual reading sent to EBCM by each wheel speed sensor, stoplight switch status and various other inputs and outputs are monitored. - Mode F1 (Code History)
Mode displays fault code history data. Fault occurrence information is stored for first 5 fault codes stored and very last fault code stored. Fault occurrence information stored consists of fault code number, number of failure occurrences and number of drive cycles since fault first and last occurred. - F2 (Mode Trouble Codes)
Mode displays ABS trouble codes stored by EBCM. Trouble codes can be cleared in this mode. - Mode F3 (ABS Snapshot)
Mode helps isolate intermittent problems by capturing data before and after fault occurred. By selecting Manual Trigger, Tech 1 will wait for ENTER to be pressed before storing speed sensor information. All stored information can be displayed and examined for conditions that may indicate a problem. - Mode F4 (ABS Test)
In this mode, Tech 1 performs hydraulic modulator assembly testing to help isolate problems during trouble shooting. Mode is also used for manual control of hydraulic modulator motors, which is used prior to bleeding brakes.
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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