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.
Possible Causes
2021 Ford Edge SE, 4WDSECTION Possible Causes
WARNING: This page is about a different car, the 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
- Wiring, terminals or connectors
- HydroMax pump motor relay
- ABS module
- CU1: CHECK PUMP MOTOR RELAY COIL GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- CU2: CHECK PUMP MOTOR RELAY COIL GROUND CIRCUIT FOR A SHORT TO GROUND
- Measure the resistance between:
(+) HydroMax Relay Connector, Harness Side (-) HRC Ground - Is the resistance greater than 10, 000 ohms?
Yes No Go to CU3. REPAIR the circuit.
- Measure the resistance between:
- CU3: CHECK PUMP MOTOR RELAY COIL GROUND CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition ON, engine OFF.
- Measure the voltage between:
(+) HydroMax Relay Connector, Harness Side (-) HRC Ground - Is any voltage present?
Yes No REPAIR the circuit. Go to CU4.
- CU4: CHECK FOR CORRECT ABS MODULE OPERATION
- Ignition OFF.
- Inspect the ABS module electrical connector and the HydroMax relay socket.
- Repair:
- corrosion (install new connector, socket or terminal - clean module or relay pins)
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary
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.