Abbasi Engineering & Service's

20/06/2026

25/12/2025

STANDARD CAR RADIATOR FAN WIRING (THERMO SWITCH + RELAY)
A comprehensive diagram detailing the wiring for a car radiator fan, using a thermo switch and relay. This setup ensures the fan activates automatically when the engine reaches a certain temperature. It includes connections for the ignition signal, battery, heavy fuse, fuse box, and common ground to the vehicle chassis. The fan only works when the engine is on.

25/12/2025

Automotive Electronics: The Electronic Throttle Body (ETB) Pinout Guide 🚗⚡
Understanding how your throttle body communicates with the ECU is vital for modern vehicle diagnostics. Here is a detailed breakdown of the standard 6-pin configuration:
🔌 Pin 1 & Pin 2: Throttle Actuator Control (TAC) Motor
These pins are connected directly to the electric motor inside the throttle body. The ECU regulates the current passing through these pins to move the butterfly valve. The direction of the current determines whether the valve opens or closes, ensuring a dynamic response based on your accelerator pedal position. ⚙️💨
🔌 Pin 3: Sensor Ground
This serves as the benchmark for the Throttle Position Sensors (TPS). A clean ground is essential for signal accuracy. If this pin has a poor connection or high resistance, signals become erratic, leading to reading failures and poor engine performance. 📉
🔌 Pin 4: Throttle Position Sensor (TPS) Signal 1
This pin transmits a voltage signal proportional to the butterfly valve's position. Using either potentiometer or Hall Effect technology, it tells the ECU exactly how much air is entering. The ECU then uses this data to adjust fuel injection and ignition timing in real-time. 🧠💻
🔌 Pin 5: +5V Reference
This is the constant 5V power supply provided by the ECU to the sensors. This reference voltage is the "lifeblood" of the sensor's function. Any voltage drop here will result in unreliable signals and a failed throttle response. ⚡🔋
🔌 Pin 6: Throttle Position Sensor (TPS) Signal 2
Safety is a priority! This pin provides a redundant backup signal (usually the inverse of Signal 1). The ECU constantly compares Pin 4 and Pin 6; if a discrepancy is detected, the system enters "Limp Mode" to prevent engine damage or loss of control. ⚠️🛡️

25/11/2025

Fire Extinguisher Inspection