C1256

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1256: Accumulator Low Pressure
C1256 - Accumulator Low Pressure

DESCRIPTION

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









INSPECTION PROCEDURE

NOTICE:
When replacing the master cylinder solenoid, perform zero point calibration Calibration.

HINT
When DTC C1251, C1253 or C1254 is output together with DTC C1256 inspect and repair the trouble area indicated by DTC C1251, C1253 or C1254 first.

PROCEDURE

1. RECONFIRM DTC

(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(b) Turn the ignition switch off.

(c) Depress the brake pedal more than 40 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





HINT
Excessive brake pedal operation results in abnormal accumulator pressure consumption. This is normal.

B -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting
A -- Continue to next step.

2. CHECK HYDRAULIC CIRCUIT

(a) Check the hydraulic circuit On-Vehicle Inspection.

OK:

Hydraulic circuit is normal (No leakage).

NG -- REPAIR HYDRAULIC CIRCUIT
OK -- Continue to next step.

3. READ VALUE USING TECHSTREAM (ACCUMULATOR SENSOR)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.

ABS/VSC/TRAC





(f) 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 MASTER CYLINDER SOLENOID Disassembly
OK -- Continue to next step.

4. RECONFIRM DTC

(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(b) Turn the ignition switch off.

(c) Check if the same DTC is output Reading and Clearing Diagnostic Trouble Codes.

Result





B -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting

A -- REPLACE MASTER CYLINDER SOLENOID Disassembly