Sinotruk spare parts Electronic Air Pressure Sensor WG9727710002
Installed on the air storage cylinder (one for the front / rear braking circuits, namely 1st and 2nd pressure sensors), it converts the compressed air pressure inside the air storage cylinder into a linear electrical signal, which is then transmitted to the vehicle's instrument panel / BCU (Central Electrical Control Unit):
1. It enables the dashboard pressure gauge to display the current braking pressure in real time;
2. When the air pressure drops below the safety threshold, it triggers a low-pressure alarm (sound and light alarm), alerting the driver to inflate the tires or have the vehicle inspected in time;
3. It provides pressure reference signals for the ABS, EBS and other braking electronic control systems, ensuring braking safety.
Product features
1. Electronic measurement: Compared with traditional mechanical barometers, there is no mechanical wear, fast response, accurate reading, and long lifespan;
2. Linear output: The relationship between air pressure and output voltage is good, the instrument display is stable, and there are no jumping pins;
3. Original factory pin definition: 3-pin standard connector, direct insertion without rewiring;
4. Sealing structure: Double sealing with threads and sealing rings, preventing air leakage from the storage cylinder, suitable for humid, dusty, and oily environments;
5. Anti-interference design: Built-in signal conditioning circuit, suppressing electromagnetic interference from the entire vehicle, stable signal without drift;
6. Small size and light weight: Directly screwed onto the storage cylinder, not occupying additional space.
The problem solved
1. The pressure gauge does not display / shows inaccurate readings: The internal chip of the old sensor has aged and the signal has drifted, resulting in the dashboard pressure reading being zero, abnormally high, or fluctuating. After replacement, accurate display is restored;
2. Abnormal low-pressure alarm: Sensor failure will cause false alarms (alarming when the pressure is normal) or no alarms (no prompt when the pressure is too low), posing a braking safety hazard. After replacement, the alarm logic returns to normal;
3. Air passage leakage: The old parts' sealing rings have aged and the shell has cracked, causing slow leakage of the air reservoir. The air pump starts and stops frequently. Replacement of new parts restores sealing;
4. Poor contact of wiring harness: Corrosion and loosening of the sensor connector pins cause signal interruption. It can be solved by replacing the AZ991577000547 extension wiring harness together;
5. Fault codes reported by ABS/EBS system: Abnormal air pressure signals will cause the braking electronic system to report errors. After replacing the sensor, the fault is cleared.
Q: Which truck models does this sensor fit?
A:Fits SINOTRUK HOWO A7, T7H, T5G, SITRAK C7H / C9H, TX, STR and Golden Prince series heavy trucks.
Q:What is the function of this air pressure sensor?
A:It is installed on the air reservoir (air tank) of the brake system. It converts compressed air pressure into a linear electrical signal, sends it to the dashboard / BCU, displays real-time brake air pressure on the gauge, and triggers low-pressure alarm when air pressure is below the safe threshold.
Q: Is this an oil pressure sensor or air pressure sensor?
A: This is an air pressure sensor for the brake system, NOT an engine oil pressure sensor. Some sellers mislabel it as oil pressure sensor in product titles.
Q: What symptoms indicate the sensor needs replacement?
A: Air pressure gauge shows zero, incorrect reading or needle jumping.
• False low-pressure alarm or no alarm when pressure is actually low.
• Air leak from the sensor mounting port.
• ABS / EBS system reports fault code related to air pressure signal.
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