Vehicle Stability Control System (For Hydraulic Brake Booster)

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM (for Hydraulic Brake Booster): C1251/51: Open in Pump Motor Circuit
C1251/51 - Open in Pump Motor Circuit

DESCRIPTION

The motor relay (semiconductor relay) is built into the master cylinder solenoid and drives the pump motor based on a signal from the skid control ECU.





WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
Remove the hydraulic brake booster before the inspection Removal.

PROCEDURE

1. CHECK BRAKE PUMP MOTOR WIRE HARNESS CONNECTION (MT+ / MT-)

(a) Using a screwdriver, remove the 2 plugs from the hydraulic brake booster Disassembly.

(b) Check the tightening torque of 2 screws which fasten the wire harness connecting hydraulic brake booster and brake booster pump Reassembly.

Torque : 2.9 Nm (30 kgf-cm, 26 in-lbf)

NG -- RETIGHTEN SCREWS
OK -- Continue to next step.

2. CHECK RESISTANCE OF PUMP MOTOR WIRE HARNESS (MT+/MT-)

(a) Using a screwdriver, remove the 2 screws and pull the wire harness from the hydraulic brake booster.





(b) Measure the resistance between the red wire (MT+) and black wire (MT-).

Resistance:

2 Ohms

NG -- REPLACE HYDRAULIC BRAKE BOOSTER
OK -- Continue to next step.

3. RECONFIRM DTC

(a) Reassemble the hydraulic brake booster, then reinstall the hydraulic brake booster.

(b) Clear the DTCs Vehicle Stability Control System (for Hydraulic Brake Booster).

(c) Check if the same DTCs are detected.





B -- END

A -- REPLACE MASTER CYLINDER SOLENOID