The C1391 trouble code typically relates to a hydraulic brake system issue in Toyota vehicles. Specifically, it indicates a problem with the Accumulator Pressure Sensor Circuit. This sensor monitors the pressure in the brake booster accumulator. The C1391 code in a Toyota typically refers to a fault related to the leakage in Accumulator. The brake accumulator is a component in Toyota hybrid cars that stores hydraulic pressure to provide power assist to the brakes, Accumulator Pressure Sensor which is used to monitor the pressure in the brake accumulator. If you’re encountering this issue, please feel free to contact to diagnose and repair it, as it can affect the vehicle’s braking performance and safety.
Ignoring brake system problems is risky, so it’s best to address this issue promptly to ensure the safety and reliability of your vehicle.
Reasons why c1391 code come along with time in Pakistan after 4 to 5 year in Toyota hybrid cars.
Here are some potential reasons for this fault code:
Accumulator Seal Failure: The accumulator has seals that can degrade over time, leading to leaks. If these seals fail, hydraulic pressure can escape, triggering the C1391 code.
Accumulator Diaphragm Damage: The accumulator has a diaphragm that separates hydraulic fluid from nitrogen gas. If this diaphragm is damaged or compromised, it can cause a leak.
Faulty Pressure Sensor: The pressure sensor in the brake system may be malfunctioning, providing incorrect readings to the vehicle’s computer and triggering the code.
Hydraulic System Leak: There may be a leak elsewhere in the hydraulic system, causing a loss of pressure that the accumulator is unable to compensate for.
Faulty Accumulator Valve: The valve that controls the flow of fluid into and out of the accumulator may be faulty, causing issues with pressure regulation.
How to save ABS from failure (C 1391).
To prevent ABS failure and avoid encountering the C1391 fault code associated with leakage in the accumulator, consider the following preventive measures:
Regular Maintenance: Follow the manufacturer’s recommended maintenance schedule for your vehicle, including brake system inspections. Regular maintenance can help identify potential issues early before they escalate into larger problems.
Brake Fluid Inspection and Replacement: Ensure that the brake fluid is at the correct level and free from contamination. Brake fluid absorbs moisture over time, which can lead to corrosion and damage to ABS components. Regularly inspect and replace brake fluid according to the manufacturer’s recommendations.
Note: Before oil replacement kindly check accumulator pressure value will be hold 3.72-3.2 v for at least for 20 min, otherwise don’t replace oil or air bleed, it may damage accumulator.
Solution for c1391 leakage in accumulator.
Resolving the C1391 fault code indicating a leakage in the accumulator typically involves diagnosing and addressing the specific cause of the leak. Here’s a general solution is to replace accumulator/ are complete break booster assembly with new one.
