DTC    C1251/51    Open in Pump Motor Circuit

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DESCRIPTION

The ABS pump motor is located inside the brake actuator.

DTC No.
DTC Detection Condition
Trouble Area
C1251/51
When one of following conditions is met:
  1. Actuator pump motor does not operate properly
  2. Actuator pump motor circuit remains open for at least 2 seconds
  1. Brake actuator
  2. Brake actuator circuit

WIRING DIAGRAM


C108862E02


INSPECTION PROCEDURE

1.CHOOSE DIAGNOSIS METHOD

  1. Choose the diagnosis method.

    Method 
    Method
    		Proceed to
    Using intelligent tester
    		A
    Not using intelligent tester
    		B


B
Go to step 3
A


2.PERFORM ACTIVE TEST BY INTELLIGENT TESTER (ABS MOTOR RELAY)

  1. Select the Active Test, generate a control command, and then check that the ABS motor relay operates.


Skid control ECU: 
Item
Vehicle Condition / Test Details
Diagnostic Note
ABS Motor Relay
Turn ABS motor relay ON / OFF
Operation sound of motor can be heard

OK:
Operation sound of ABS motor is heard.


OK
REPLACE BRAKE ACTUATOR ASSEMBLY
NG


3.CHECK WIRE HARNESS (SKID CONTROL ECU - BATTERY AND BODY GROUND)
C108884E06

  1. Disconnect the S2 ECU connector.

  1. Measure the resistance of the wire harness side connector.

    Standard resistance:
    Tester Connection
    		Specified Condition
    S2-2 (GND1) - Body ground
    		Below 1 Ω
    S2-24 (GND2) - Body ground
    		Below 1 Ω

  1. Measure the voltage of the wire harness side connector.

    Standard voltage:
    Tester Connection
    		Specified Condition
    S2-23 (+BM) - Body ground
    		10 to 14 V


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE BRAKE ACTUATOR ASSEMBLY