C1098

Step 1: Perform visual inspection of ABS pump motor wiring harness from module to motor, checking for chafed, melted, or damaged insulation, particularly where harness routes near sharp edges or heat sources. Look for signs of previous repairs or water intrusion.

Step 2: Disconnect ABS pump motor connector and inspect terminals for corrosion, bent pins, or evidence of overheating. With ignition off, use a digital multimeter to measure resistance between pump motor power circuit and battery positive terminal - should read infinite resistance (open circuit).

Step 3: With pump motor disconnected, turn ignition on and measure voltage at the pump motor connector harness side. If battery voltage is present with motor commanded off, trace wiring for short to power. If no voltage present, motor or connector is likely faulty.

Step 4: Check ABS pump motor resistance by measuring across motor terminals - typical resistance 2-6 ohms depending on manufacturer. Also check motor case for short to ground. Replace motor if readings are out of specification or if internal short is detected.

Step 5: If all wiring and motor test normal, suspect ABS control module internal fault. Verify module ground connections are clean and tight, then consider module replacement if all other tests pass.

Step 6: After repair, clear codes, perform ABS system self-test, and road test vehicle to verify pump motor operates normally during ABS activation and that code does not return.