DESCRIPTION
INSPECTION PROCEDURE
CUSTOMER PROBLEM ANALYSIS
RECONFIRM DTC
CHECK HYDRAULIC CIRCUIT
READ VALUE USING GTS (ACCUMULATOR SENSOR)
RECONFIRM DTC
DTC C1452 Accumulator Low Pressure
DESCRIPTION
| DTC Code | DTC Detection Condition | Trouble Area |
| C1452 | After braking, the fluid pressure inside the accumulator is less than the threshold within 3.2 seconds. | Hydraulic circuit
Master cylinder solenoid (Accumulator pressure sensor)
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INSPECTION PROCEDURE
- After replacing the master cylinder solenoid, perform zero point calibration and store the system information ().
| 1.CUSTOMER PROBLEM ANALYSIS |
Check with the customer to determine if frequent braking has been performed.
Turn the ignition switch off.
Depress the brake pedal more than 40 times.
Turn the ignition switch to ON.
Check if the same DTC is output ().
Result | Result | Proceed to |
| DTC is output | A |
| Frequent braking was not performed and DTC is not output | B |
| Frequent braking was performed and DTC is not output | C |
- Excessive brake pedal operation results in abnormal accumulator pressure consumption. This is normal.
| | CHECK FOR INTERMITTENT PROBLEMS ()
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| 3.CHECK HYDRAULIC CIRCUIT |
Check the hydraulic circuit ().
- OK:
- Hydraulic circuit is normal (no leakage).
| 4.READ VALUE USING GTS (ACCUMULATOR SENSOR)
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Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Enter the following menus: Chassis / ABS/VSC/TRC / Data List.
ABS/VSC/TRC| 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. |
Check that the accumulator output value is normal.
- OK:
- Accumulator pressure sensor value is normal.
Result| Result | Proceed to |
| OK | A |
| NG (for LHD) | B |
| NG (for RHD) | C |
| | REPLACE MASTER CYLINDER SOLENOID ()
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| | REPLACE MASTER CYLINDER SOLENOID ()
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Check if the same DTC is output ().
Result| Result | Proceed to |
| DTC is not output | A |
| DTC is output (for LHD) | B |
| DTC is output (for RHD) | C |
| | REPLACE MASTER CYLINDER SOLENOID ()
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| | REPLACE MASTER CYLINDER SOLENOID ()
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| A | |
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| CHECK FOR INTERMITTENT PROBLEMS ()
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