Open in Pump Motor Circuit - ABS (Antilock Brake System)

BRAKE CONTROL: ANTI-LOCK BRAKE SYSTEM: C1251/51: Open in Pump Motor Circuit

DTC C1251/51 - Open in Pump Motor Circuit

DESCRIPTION





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHOOSE DIAGNOSIS METHOD
(a) Choose the diagnosis method.

Method:





B -- CHECK SKID CONTROL ECU CONNECTOR (GROUND)
A -- Continue to next step.
2. PERFORM ACTIVE TEST USING TECHSTREAM
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Enter the following menus: Chassis / ABS/VSC/TRAC / Active Test.
(d) Read the ABS Motor Relay status.

ABS/VSC/TRAC:





OK:
The operation sound of the ABS motor should be heard.
OK -- REPLACE BRAKE ACTUATOR ASSEMBLY
NG -- Continue to next step.
3. CHECK SKID CONTROL ECU CONNECTOR (GROUND)




(a) Disconnect the S1 skid control ECU connector.
(b) Measure the resistance of the wire harness side connector.
Standard resistance:





NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
4. RECONFIRM DTC
(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Drive the vehicle at a speed of 6 km/h (4 mph) or more.
(c) Are the same DTCs recorded? Reading and Clearing Diagnostic Trouble Codes
HINT:
- The skid control ECU inspects the motor relay circuit when the stop light switch is turned off and the vehicle is running at a speed of 6 km/h (4 mph) or more.
- This DTC may be recorded due to a malfunction in the connector terminal connection, etc.

NO -- END
YES -- REPLACE BRAKE ACTUATOR ASSEMBLY