C1256

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1256/56: Accumulator Low Pressure

DTC C1256/56 - Accumulator Low Pressure

DESCRIPTION

The accumulator pressure sensor is connected to the skid control ECU in the master cylinder solenoid.









INSPECTION PROCEDURE
NOTE: When replacing the master cylinder solenoid, perform zero point calibration Programming and Relearning.

PROCEDURE

1. RECONFIRM DTC
(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
(b) Turn the ignition switch off.
(c) Depress the brake pedal more than 20 times.
(d) Turn the ignition switch to ON.
(e) Wait for 99 seconds.
(f) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.
Result:






B -- END
A -- Continue to next step.
2. CHECK HYDRAULIC CIRCUIT
(a) Perform hydraulic brake booster on-vehicle inspection On-Vehicle Inspection.
OK:
Hydraulic circuit is normal (No leakage).
NG -- REPAIR HYDRAULIC CIRCUIT
OK -- Continue to next step.
3. READ VALUE USING DATA LIST (MASTER CYLINDER PRESSURE SENSOR)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the tester on.
(d) Select the following menu items: Chassis / ABS/VSC/TRAC/ Data List

DATA LIST: ABS/VSC/TRAC





(e) Check that the accumulator's output value is in the Normal Condition range.
OK:
Accumulator pressure sensor value is in the Normal Condition.
NG -- REPLACE HYDRAULIC BRAKE BOOSTER
OK -- Continue to next step.
4. RECONFIRM DTC
(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
(b) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.
Result:






B -- END
A -- REPLACE MASTER CYLINDER SOLENOID