DESCRIPTION
The accumulator pressure sensor is connected to the skid control ECU in the master cylinder solenoid.
DTC Code |
DTC Detection Condition |
Trouble Area |
---|---|---|
C1254 |
There is an accumulator pressure sensor malfunction (the fluid pressure does not change when the pump operates or when the brake is applied). |
Master cylinder solenoid (Accumulator pressure sensor) |
CAUTION / NOTICE / HINT
NOTICE:
When replacing the master cylinder solenoid, perform calibration (See page
).
PROCEDURE
1. |
READ VALUE USING TECHSTREAM (ACCUMULATOR SENSOR) |
(a) Turn the ignition switch off.
(b) Connect the Techstream to the DLC3.
(c) Depress the brake pedal more than 40 times.
(d) Turn the ignition switch to ON.
(e) Turn the Techstream on.
(f) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.
ABS/VSC/TRAC
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
---|---|---|---|
Accumulator Sensor |
Accumulator pressure sensor reading/ Min.: 0.00 V, Max.: 5.00 V |
3.58 to 5 V |
If the value is constant regardless of the pump operation, an accumulator pressure sensor malfunction is suspected. |
(g) Check the accumulator output value.
Result
Result |
Proceed to |
---|---|
Output value is within "Normal Condition" range |
A |
Output value is out of "Normal Condition" range |
B |
Output value is constant regardless of pump operation |
B | ![]() |
REPLACE MASTER CYLINDER SOLENOID |
|
2. |
RECONFIRM DTC |
(a) Clear the DTCs (See page ).
(b) Turn the ignition switch off.
(c) Depress the brake pedal more than 40 times.
(d) Turn the ignition switch to ON.
(e) Wait until the pump motor stops.
(f) Wait for 15 minutes.
(g) Depress the brake pedal and release it.
(h) Check if the same DTC is output (See page
).
Result |
Proceed to |
---|---|
DTC is output |
A |
DTC is not output |
B |
A | ![]() |
REPLACE MASTER CYLINDER SOLENOID |
B | ![]() |
USE SIMULATION METHOD TO CHECK |
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
HINT:
Use the table below to help determine the cause of problem symptoms. If multiple
suspected areas are listed, the potential causes of the symptoms are listed in order
of probability in the "Suspected Area" column of ...
Inspection
INSPECTION
PROCEDURE
1. INSPECT FRONT DRIVE SHAFT ASSEMBLY
NOTICE:
Keep the drive shaft level while handling it.
(a) Check if there is excessive play in the outboard joint.
(b) Check if the inboard joint shaft slides smoothly in the thrust direction.
...