C0110

Step 1: Visually inspect the ABS pump motor wiring harness and connector for physical damage, corrosion, loose pins, or signs of water intrusion. Check connector integrity at both pump motor and control module ends.

Step 2: Using a digital multimeter, verify pump motor fuse integrity and check for proper battery voltage (12-14V) at the pump motor power supply circuit with ignition on. Measure voltage drop across fuse and relay contacts.

Step 3: Disconnect pump motor connector and measure pump motor resistance across motor terminals using an ohmmeter. Typical readings should be 1-5 ohms depending on manufacturer; infinite resistance indicates open circuit, near-zero indicates short. Also check for short to ground.

Step 4: With pump motor disconnected, command pump motor operation using advanced scan tool bi-directional controls. Monitor current draw at the control module connector. Excessive current (over 20A) or no current indicates control module or circuit fault.

Step 5: If pump motor resistance is within specification and wiring is intact, perform voltage drop test on ground circuit while commanding pump operation. Voltage drop should be less than 0.5V; excessive drop indicates poor ground connection.

Step 6: Replace faulty component (pump motor, wiring, or control module based on findings), clear codes, perform system initialization/bleeding procedure per manufacturer specifications, and verify repair by test driving and monitoring for code return.