Possible Causes
- Wiring, terminals or connectors
- HydroMax pump motor relay
- ABS module
- CU1: CHECK PUMP MOTOR RELAY COIL GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- ABS Module connector disconnected.
- Hydraulic Fluid Flow Switch connector disconnected.
- HydroMax Relay connector disconnected.
- Measure the resistance between:
(+) Hydraulic Fluid Flow Switch Connector, Harness Side (-) ABS Module Connector, Harness Side HRC HRC - Measure the resistance between:
(+) Hydraulic Fluid Flow Switch Connector, Harness Side (-) HydroMax Relay Connector, Harness Side HRC HRC - Are the resistances less than 3 ohms?
Yes No Go to CU2. REPAIR the circuit. - 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
- ABS Module connector connected. Make sure the connector seats and latches correctly.
- Hydraulic Fluid Flow Switch connector connected. Make sure the connector seats and latches correctly.
- HydroMax Relay connector connected. Make sure the relay is fully seated.
- Operate the system and determine if the concern is still present.
- Is the concern still present?
Yes No INSTALL a new ABS module.
CHECK OASIS for any applicable 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 order form.
If this is a Ford paid repair, INCLUDE the RVC on the warranty form.The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.