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

Start the inspection from step 1 when using Techstream and start from step 3 when not using Techstream.

PROCEDURE

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

ABS/VSC/TRAC





OK:
The operation sound of the ABS motor should be heard.
NG -- INSPECT FUSE (ABS NO. 1)
OK -- Continue to next step.
2. RECONFIRM DTC
(a) Clear the DTCs (Reading and Clearing Diagnostic Trouble Codes).
(b) Check if the same DTCs are detected.





B -- END
A -- REPLACE BRAKE ACTUATOR
3. INSPECT FUSE (ABS NO. 1)





(a) Remove the ABS NO. 1 fuse from the engine room R/B and J/B.
(b) Measure the resistance of the ABS NO. 1 fuse.
Standard Resistance:
Below 1 Ohms
(c) Reinstall the ABS NO. 1 fuse.
NG -- CHECK FOR SHORTS IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE
OK -- Continue to next step.
4. INSPECT SKID CONTROL ECU TERMINAL VOLTAGE (+BM TERMINAL)





(a) Disconnect the skid control ECU connector.
(b) Measure the voltage.
Standard Voltage:





(c) Reconnect the skid control ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (GND1, GND2 - BODY GROUND)





(a) Disconnect the skid control ECU connector.
(b) Measure the resistance.
Standard Resistance:





(c) Reconnect the skid control ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE BRAKE ACTUATOR