C1254
BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1254/54: Pressure Switch Circuit
DTC C1254/54 - Pressure Switch Circuit
DESCRIPTION
The accumulator pressure sensor is connected to the skid control ECU in the master cylinder solenoid.
HINT:
If the code C1254/54 is output, the following conditions occur:
- The ABS and BRAKE warning lights, and SLIP and VSC OFF indicator lights come on.
- The skid control buzzer sounds.
- Control of all systems other than EBD is canceled.
INSPECTION PROCEDURE
NOTE: When replacing the master cylinder solenoid, perform zero point calibration Programming and Relearning.
PROCEDURE
1. READ VALUE USING TECHSTREAM (ACCUMULATOR PRESSURE SENSOR)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch off.
(c) Depress the brake pedal more than 20 times.
(d) Turn the ignition switch to ON and turn the Techstream main switch ON.
(e) Select "Data List" mode on the Techstream.
ABS/VSC/TRAC
(f) Check the accumulator output value.
Result:
B -- REPLACE MASTER CYLINDER SOLENOID
A -- Continue to next step.
2. READ VALUE USING TECHSTREAM (MASTER CYLINDER PRESSURE SENSOR)
(a) Turn the ignition switch off.
(b) Depress the brake pedal more than 20 times.
(c) Install the brake pedal effort gauge (SST), and bleed air.
SST: 09709-29018
(d) Turn the ignition switch to ON and turn the Techstream main switch ON.
(e) Select "Data List" mode on the Techstream.
ABS/VSC/TRAC
(f) Check that the master cylinder pressure sensor's output value is normal.
OK:
Master cylinder pressure sensor value is normal.
NG -- REPLACE MASTER CYLINDER SOLENOID
OK -- Continue to next step.
3. 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 until the pump motor stops.
(f) Depress the brake pedal and release it.
(g) Wait for 25 minutes.
(h) Check if the same DTC is detected Reading and Clearing Diagnostic Trouble Codes.
Result:
B -- CHECK FOR INTERMITTENT PROBLEMS
A -- REPLACE MASTER CYLINDER SOLENOID