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Truly a ridiculous amount of electronics in this vehicle. Lots of fuses and modules for radiator cooling, but no relay. That means it is a function of the ECM and the 'modules'.
There isn't one. The engine malfunction light is generated by the Engine Control Module (ECM) to show faults that the 'computer' has found. If the bulb has gone, you change it. If the light isn't lighting up, that's good.
check relay ecm ,enigine control module i replace every sensor possible over 1,000.00 parts and even computer but ended up being a 12.00 ecm relay above your fuses cheers
On a Digifant fuel system, the fuel pump is mounted in a reservoir
under the rear of the vehicle. The fuel filter is also in this area.
The reservoir holds one liter of fuel and is supplied by a small
transfer pump in the tank. The transfer pump can be replaced separately
even though they are installed and removed as a unit.
The
Motronic system uses two fuel pumps. The first is a small transfer pump
to get the fuel out of the tank and the second boosts the fuel pressure
to the necessary amount. The transfer pump is located inside the tank
and the main pressure pump can be found under the vehicle. This
transfer pump is located under the rear seat and is part of the fuel
gauge sending unit. The main fuel pump can be found in the reservoir in
front of the rear axle beam. There is a check valve inside this pump to
maintain pressure in the lines, especially on hot days, to avoid vapor
lock. The fuel filter is mounted to the side of the reservoir. This
filter has no specified replacement interval and should be good for the
entire service life of the vehicle. Whenever the ignition key is in the
on position, the pump should run for at least two (2) seconds to
pressurize the fuel lines. If the Engine Control Unit (ECM) does not
see a signal from the Hall Effect sensor in the distributor it will
shut the pump off. If a Hall Effect signal is present, the pump will
continue to run as long as a signal is detected. It is this Hall Effect
signal that signals the ECM that the engine is rotating therefore
indicating that fuel is needed. The pump is operated via a relay that
is controlled by the ECM. This relay is located in the vehicles fuse
panel. The main contacts of the relay can be jumped to run the pump
during testing.
Check the load reduction relay. I had this happen twice and repaired twice on my TDI mk IV. It throws no codes and almost has to be witnessed by a mechanic to be believed.
Check your ecm relay I had one go goofy on my 1994 Passat it controls power to the ecm modual the car will turn over but will not start it should read 109 on the top of the relay I replaced it in my passat and it fired right up and I havent had a problem since
Click on the link.
This is for 03 jetta gls
There are fuses for left and right low beams. Headlights on low beam, use a test light, see if voltage on fuse circuit? If no voltage that will lead us back to dimmer switch or problem with wiring circuit from dimmer switch.
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