This increases the chances of failure over time. In modern common rail diesel engines, fuel pressures can be over 25,000 psi.īecause the injector is seated in the top of the engine cylinder, it is constantly exposed to heat and pressure. When the needle valve is opened, fuel under enormous pressure is sprayed into the combustion chamber. The opening and closing of the valve is operated by a solenoid. It arrives via a nozzle that is opened and closed with a needle valve. So it is vital the each part of the system, including each injector are operating properly.įuel from the tank is routed to the injector and sprayed into the combustion chamber. The whole process involves the complex interaction of all parts of the fuel management system, under the control of the ECU. Most modern engines use a technique known as direct injection to get the fuel into the engine chamber. The job of a fuel injector is to deliver fuel to the combustion chamber of the engine at a controlled rate and in the right amount. If the fuel injector is not operating properly, then other parts of the engine will be affected and over time can be damaged. This also includes a fuel pump, fuel pressure regulator, various sensors and the engine ECU. They are a vital part of a complex fuel management system. In a bid to reduce exhaust emissions, manufacturers were forced to change how fuel consumption was controlled by engines.įuel injectors are now used in pretty much all passenger vehicles. Up until the 1980’s, fuel injection was controlled in most engines by a carburettor. A bad fuel injector will wreak havoc with how your engine runs, and will likely leave you stranded on the side of the road. WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.Fuel injectors are used in all modern engines, and are a vital component in the fuel management system. Windshield and Rear Window Washer Pump Relay Mid Bussed Electrical Center, HomeLink, Rear Heated Seatsīrake Transmission Shift Interlock System Instrument Panel Cluster/Driver Information Center Instrument Panel Cluster, Air Conditioning Relay, Turn Signal/Hazard Switch, Starter Relayīack-up Lamps, Automatic Transmission Shift Lock Control System Vent Solenoid Canister/Quadrasteer Module PowerĮlectronic Throttle Control, Electronic Brake Controlle Left Bussed Electrical Center, Left Doors, Truck Body Controller, Flasher Module Left Bussed Electrical Center, Door Modules, Door Locks, Auxiliary Power Outlet-Rear Cargo Area and Instrument PanelĪccessory Power/Trailer Wiring Brake Feed Mid Bussed Electrical Center Power Feed, Front Seats, Right Doors
2003 sl500 battery isolator relay fault install#
*2 - Gasoline Engine and Fuel Injection Rail #1.Īuxiliary Power (Single Battery and Diesels Only)/Dual Battery (TP2) Do not install fuse *1 - Gasoline Engine and Fuel Injection Rail #2. GMC Yukon – fuse box – engine compartment The underhood fuse/relay center is located in the rear of the engine compartment near the brake fluid reservoir. GMC Yukon – fuse box – center instrument panel Relay nameĭriver and Passenger Seat Module Circuit Breaker The center instrument panel utility block is located underneath the instrument panel, to the left of the steering column. Vehicle Stoplamps, Brake Module, Electronic Throttle Control Module Vehicle and Trailer High Mounted Stoplamp Power Door Lock Relay (Driver’s Door Unlock Function)
Inside Rearview Mirror, Climate Control System Nameįour-Wheel Drive System, Auxiliary Battery The fuse block access door is on the driver’s side edge of the instrument panel. Year of production: 2003, 2004 Instrument Panel Fuse Block GMC Yukon – fuse box – instrument panel GMC Yukon (2003 – 2004) – fuse box diagram
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