Vehicle Stability Control System

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1251/51: Open in Pump Motor Circuit

DTC C1251/51 - Open in Pump Motor Circuit

DESCRIPTION

The ABS pump motor is located inside the brake actuator. The motor is used for BA, TRAC and VSC operation.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTE: When replacing the ABS and TRACTION actuator assembly, perform zero point calibration (Programming and Relearning).

PROCEDURE

1. PERFORM ACTIVE TEST BY TECHSTREAM (ABS MOTOR RELAY)
(a) Connect Techstream to the DLC3.
(b) Start the engine.
(c) Select the Active Test mode on Techstream.
(d) Check the operation sound of the ABS motor individually when operating it with Techstream.

ABS / VSC / TRAC:





ON:
The operation sound of the ABS motor should be heard.
NG -- INSPECT SKID CONTROL ECU (GND TERMINAL)
OK -- REPLACE ABS AND TRACTION ACTUATOR ASSEMBLY
2. INSPECT SKID CONTROL ECU (GND TERMINAL)





(a) Disconnect the skid control ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)
OK -- Continue to next step.
3. RECONFIRM DTC

HINT: This code is detected when a problem is determined in the ABS and TRACTION actuator assembly.

The ABS motor relay is in the ABS and TRACTION actuator assembly.

Therefore, motor relay circuit inspection and relay unit inspection cannot be performed. Be sure to check if the DTC code is output before replacing the ABS and TRACTION actuator assembly.

(a) Clear the DTCs (Vehicle Stability Control System).
(b) Turn the ignition switch to the ON position.
(c) Are the same DTCs recorded?
NO -- END
YES -- REPLACE ABS AND TRACTION ACTUATOR ASSEMBLY