C052B

Code

Generic C — Chassis

ABS Pump Motor Control Range/Performance

Brand: Generic

Type: C — Chassis

Views: UK: 32 EN: 61 RU: 29

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Open, shorted or high-resistance wiring between ABS ECU and pump motor
Poor or corroded connector or ground at pump motor
Failed ABS pump motor (electrical or mechanical seizure)
Faulty ABS/traction control module or motor driver transistor
Blown fuse or faulty relay supplying pump motor
Low battery voltage or poor charging system causing under-voltage during pump command

Read all stored ABS/BCM/engine DTCs and note freeze frame/live data
Check battery voltage with engine off and during cranking (>12.2 V static, >13.5 V charging)
Visual inspection of pump motor connector, wiring harness and ground for corrosion, damage or loose pins
Check ABS pump fuse(s) and pump relay operation
Use a scan tool to command the pump on/off and observe live data (pump command, duty cycle, motor current, module status)
Measure voltage at pump motor positive terminal while commanded and check ground continuity

Supply voltage at pump motor: approximately battery voltage when commanded (approx. 11–14.5 V)
Control signal: PWM/duty command from ABS module (0–100% duty cycle depending on action)
Motor current (typical range): low to moderate when free-running, may spike on engagement — approximate expected range 5–30 A (vehicle-specific)
Motor winding resistance: low ohms (typically
Command response: pump should start within fractions of a second after command and produce measurable current and audible operation

Record all ABS-related DTCs, freeze frame and live data. Note if multiple codes are present.
Verify battery voltage and charging system. Recharge/replace battery if voltage is low.
Perform visual inspection: disconnect battery, inspect pump motor connector and harness for corrosion, bent pins, damaged insulation or water intrusion; inspect ground strap and pump mounting for cleanliness and tightness.
Check fuses and pump relay. Swap relay with a known-good identical relay (if available) to rule out relay failure.
With a diagnostic scanner, command the ABS pump ON while an assistant monitors for audible operation and live parameters (pump command, duty, motor current).
Measure supply voltage at the pump motor positive terminal and ground continuity to chassis while pump is commanded. Voltage should be near battery voltage; ground should be low resistance.