Are you looking for a wiring diagram for your 350 TBI ECM system? Look no further! In this article, we will provide you with a detailed guide on the wiring diagram of the 350 TBI ECM system. We will cover everything from the basics to some of the most frequently asked questions regarding this system. Read on to learn more!
What is a 350 TBI ECM System?
The 350 TBI ECM system is a fuel injection system designed for use in small block V8 engines. This system was used in many GM vehicles from the 1980s to the early 1990s. The ECM (engine control module) is responsible for controlling the fuel injection and ignition timing of the engine.
The TBI (throttle body injection) system is a type of fuel injection system that uses a single injector located in the throttle body. The injector sprays fuel directly into the intake manifold. This system is simpler and less expensive than other types of fuel injection systems, making it a popular choice for small block V8 engines.
Wiring Diagram Overview
The wiring diagram for the 350 TBI ECM system consists of several components, including the power supply, ground, sensors, Actuators, and injectors. Let’s take a closer look at each component below.
Power Supply
The power supply for the ECM comes from the battery through a fuse. The power supply is provided to the ECM through the pink wire, which is connected to pin 9 of the ECM connector.
Ground
The ground for the ECM is provided through several wires, including the black wire, which is connected to pin 2 of the ECM connector. There are also several other ground wires that are connected to the engine block, including the ground wires for the sensors and actuators.
Sensors
The sensors in the 350 TBI ECM system include the coolant temperature sensor, the throttle position sensor, the manifold absolute pressure (MAP) sensor, and the oxygen (O2) sensor. These sensors provide information to the ECM to help it determine the correct air/fuel ratio for the engine.
Actuators
The actuators in the 350 TBI ECM system include the idle air control (IAC) valve, the EGR (exhaust gas recirculation) valve, the canister purge solenoid, and the fuel pump relay. These actuators are controlled by the ECM to help regulate various engine functions.
Injectors
The injectors in the 350 TBI ECM system are controlled by the ECM to provide the correct amount of fuel to the engine. These injectors are located in the throttle body and are fed fuel from the fuel pump.
Wiring Diagram FAQ
What type of wire should I use for the ECM wiring?
The wire used for the ECM wiring should be a high-temperature, automotive-grade wire. This type of wire is designed to withstand the heat and vibrations associated with the engine compartment.
Where can I find a wiring diagram for my specific vehicle?
You can find a wiring diagram for your specific vehicle in the service manual for your vehicle. This manual can be purchased online or from your local auto parts store.
What should I do if I’m having trouble with my ECM wiring?
If you’re having trouble with your ECM wiring, it’s important to first check for any loose or corroded connections. You should also check the fuses and relays associated with the ECM system. If you’re still having trouble, it may be necessary to take your vehicle to a qualified mechanic.
Can I modify the ECM wiring to increase engine performance?
Modifying the ECM wiring can be a complicated process and is not recommended for inexperienced individuals. It’s also important to note that modifying the ECM wiring can void your vehicle’s warranty and may not be legal in all states. If you’re interested in increasing engine performance, it’s best to consult with a qualified mechanic or performance shop.
Conclusion
The 350 TBI ECM system is a popular fuel injection system used in many GM vehicles from the 1980s to the early 1990s. Understanding the wiring diagram of this system is essential for troubleshooting and maintenance. We hope this article has provided you with a comprehensive guide on the wiring diagram of the 350 TBI ECM system. If you have any further questions, feel free to leave a comment below!
| Pin Number | Wire Color | Function |
|---|---|---|
| 1 | Red/White | Fuel Pump Relay Output |
| 2 | Black | Ground |
| 3 | Light Blue | A/C Compressor Clutch Signal |
| 4 | Pink | Ignition Power |
| 5 | White | Diagnostic Test Terminal |
