How does the fuel pump relay work on a Jetta?
Turning the key in the ignition sends an impulse to the Powertrain Control Unit (PCU), which activates the fuel pump relay to start the fuel pump motor. The fuel pump pressurizes the fuel system before the engine starts. Fuel enters the fuel pump through a filtered tube and exits the pump by a one-way valve.
What is the relay code for a VW Jetta?
Relay code number 100 is replaced by relay code number 370 depending on production. N… – Ignition coils 1-4 with output stage (up to May 2005) N… – Ignition coils 1-4 with output stage (up to May 2005) N… – Injectors cylinders 1-4 (up to May 2005) N… – Injectors (up to May 2005)
Where is the fuse box located on a Volkswagen Jetta?
Year of production: 2003, 2004, 2005, 2006, 2007, 2008, 2009 Engine compartment fuse box Relay carrier on onboard supply control unit (left under dash panel) The instrument panel fuse panel Additional relay carrier, under box in engine compartment
How does a fuel pump relay control the fuel pump?
The fuel pump relay is usually controlled by the ignition or Powertrain Control Module, and when switched on, will provide current to the fuel pump so that it may function. As the fuel pump relay controls power to the fuel pump, any faults with it can cause issues with the fuel pump,…
What is the diagnostic code for Jetta fuel pump?
If the powertrain diagnostic code is P0452, the fuel tank pressure sensor is reporting that the voltage is low on the fuel tank pressure circuit. A Fuel Tank Pressure Transducer (FTPT), a Canister Vent Solenoid (CVS) and Fuel Level Input (FLI), along with a Canister Purge Valve (CPV), can be used to find fuel leaks 0.040-inch in diameter or larger.
Why is my fuel pump relay not working?
Faulty Fuel Pump Relay If the fuel pump runs and the fuel pressure is normal, but the engine will not start, the problem is the fuel pump relay. The fuel pump does not pump enough gas if the voltage to it is low. Voltage to the fuel pump must be within half a volt of normal.
What happens if you have a bad fuel pump?
Car Will Not Start. Another more serious symptom of an issue with the fuel pump is a no-start condition. If the fuel pump fails completely — to the point of not being able to provide enough fuel for the engine to run, the vehicle will refuse to start.
Where is the fuel pump fuse box located?
The engine’s or the dashboard fuse box is usually a long black box containing a fuel pump relay and various other fuses and relays. For different vehicles, the fuel pump relays can be located in different places.
Where is the fuel pump in a car?
The fuel pump is located in the fuel tank, near the rear of the vehicle and can usually be heard when the engine starts. A healthy fuel pump plus a healthy fuel pump relay will often produce a variation of a low volume hum or whine which can be heard from inside the vehicle, or from the outside, near the fuel tank.
Why is the Check Engine light on on my Jetta?
If the “Check Engine” light is on, your engine’s emissions level is too high. The “Check Engine” light most likely means that the fuel system is not properly pressurized, or the gasoline/air mixture is incorrect.
https://www.youtube.com/watch?v=n9vGoUzRmcU
Where are the running lights on a Jetta IV?
Daytime Running Lights Change-over Relay Location 8 through 3/99; location 7 from 4/99 J207 53/185 (See Note) 3 D/50b Starting Interlock Relay Manual transmission only; 185 through 4/99; 53 from 5/99 J226 175 11 S176 S7 Park/Neutral Position Relay Automatic transmission only J271 428 X S10 Motronic ECM Power Supply Relay Gasoline engine only
What are the relays on a golf cart?
S162 Secondary Air Injection (AIR) Pump Relay Gasoline engine only J317 109 12 S176 Power Supply Relay Diesel only J398 79 2 S238 Remote Rear Lid Relay MY99 Jetta only; MY01 Jetta Wagon only J453 450 5/6 S176 Control Module for Multifunction Steering Wheel Power Sources and Circuits A Battery D Ignition Switch E1 Light Switch E4