READ VALUE USING INTELLIGENT TESTER (ACCUMULATOR SENSOR)
DTC C1256/56 Accumulator Low Pressure
Description
The accumulator pressure sensor is connected to the skid control ECU in the master cylinder solenoid.
DTC Code | DTC Detection Condition | Trouble Area |
C1256/56 | The fluid pressure inside the accumulator is below the standard value. |
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Inspection procedure
NOTICE:
When replacing the master cylinder solenoid, perform zero point calibration .
HINT:
When C1251/51, C1253/53, or C1254/54 is output together with C1256/56, inspect and repair the trouble area indicated by C1251/51, C1253/53, or C1254/54 first.
1.RECONFIRM DTC |
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Clear the DTC .
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Turn the ignition switch off.
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Depress the brake pedal more than 20 times.
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Turn the ignition switch to ON.
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Wait for 99 seconds.
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Check if the same DTC is output .
Result | Proceed to |
DTC is output | A |
DTC is not output | B |
HINT:
Excessive brake pedal operation results in abnormal accumulator pressure consumption. This is normal.
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A | |
2.CHECK HYDRAULIC CIRCUIT |
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Check the hydraulic circuit .
OK:
Hydraulic circuit is normal (No leakage).
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OK | |
3.READ VALUE USING INTELLIGENT TESTER (ACCUMULATOR SENSOR) |
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Connect the intelligent tester to the DLC3.
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Turn the ignition switch to ON and turn the intelligent tester on.
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Enter the following menus: Chassis / ABS/VSC/TRC / Data List.
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. |
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Check that the accumulator output value is normal.
OK:
Accumulator pressure sensor value is normal.
Result | Proceed to | |
OK | A | |
NG | LHD | B |
RHD | C |
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A | |
4.RECONFIRM DTC |
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Clear the DTC .
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Check if the same DTC is output .
Result | Proceed to | |
DTC is not output | A | |
DTC is output | LHD | B |
RHD | C |
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A | |
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