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.
Normal Operation and Fault Conditions
2021 Ford Edge SE, 4WDSECTION Normal Operation and Fault Conditions
WARNING: This page is about a different car, the 2019 Ford F-550 Super Duty, 2019 Ford F-450 Super Duty, 2019 Ford F-350 Super Duty, and 2019 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
The ABS module monitors various inputs and compares the values to what should be expected. If the values received are out of range or not what should be expected, the ABS module sets a DTC.
- AK1: CARRY OUT THE ABS MODULE/HCU CALIBRATION
- Ignition ON, engine OFF.
- Using a diagnostic scan tool, carry out the Inlet Valve Calibration and then the Master Cylinder Isolation
- Calibration.
- Clear the ABS DTCs.
- Ignition OFF.
- Ignition ON, engine OFF.
Carry out the ABS self-test.
- Are any of the DTCs listed in the Fault Trigger Conditions Table currently active and present in the ABS module?
Yes No Go to AK2. The systems is operating correctly. The concern was caused by an incomplete calibration. - AK2: CHECK FOR CORRECT ABS MODULE OPERATION
- Ignition OFF.
- Ignition ON, engine OFF.
- Using a diagnostic scan tool, carry out the Inlet Valve Calibration and then the Master Cylinder Isolation Calibration.
- Clear the ABS DTCs.
- Ignition OFF.
- Ignition ON, engine OFF.
Carry out the ABS self-test.
- Are any of the DTCs listed in the Fault Trigger Conditions Table currently active and present in the ABS module?
Yes No INSTALL a new ABS module.
CHECK OASIS for any service articles: TSB, GSB, SSM or FSA.
If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions.
If no service articles address this concern, INSTALL a new ABS module. REFER to the Anti-Lock Brake System (ABS) and Stability Control article.
ORDER a replacement ABS module and INCLUDE the RVC on the form.
If this is a Ford paid repair, INCLUDE the RVC on the warranty claim form.The systems is operating correctly. The concern was caused by an incomplete calibration. - AK3: CHECK FOR CORRECT ABS MODULE OPERATION
- Ignition OFF.
- Ignition ON, engine OFF.
- Using a diagnostic scan tool, carry out the Inlet Valve Calibration and then the Master Cylinder Isolation Calibration.
- Ignition OFF.
- Ignition ON, engine OFF.
Carry out the ABS self-test.
- Are any of the DTCs listed in the Fault Trigger Conditions Table currently active and present in the ABS module?
Yes No INSTALL a new HCU.
CHECK OASIS for any service articles: TSB, GSB, SSM or FSA.
If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions.
If no service articles address this concern, INSTALL a new ABS module and HCU assembly. REFER to the Anti-Lock Brake System (ABS) and Stability Control article.
ORDER a replacement ABS module and HCU assembly. INCLUDE the RVC form.
If this is a Ford paid repair, INCLUDE the RVC on the warranty claim form.The systems is operating correctly. The concern was caused by an incomplete calibration.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.