My Tourareg - 2007 3.6 -
High pressure fuel pump symptoms - jerking and missing - almost feels like a tranny problem, but it is motor related. Starter will spin excessively before starting.. Will eventually miss and will not rev up.
VCDS scan will show low fuel pressure failure and possibly "open circuit" for the valve on the High Pressure fuel pump.
High Pressure Fuel pump on the VR6 is located up against the firewall on the drivers side - USA. You will see the engine hoisting eyelet - it is next to that.
TROUBLE SHOOTING SHORT CUT - try this first instead of last.
1. Unplug the 2 wire clip from the bottom of the pump - this is the called the High pressure Fuel pump converter.
2. Unplug the 3 wire clip from the top of the pump - this is a pressure sensor
3. Test for continuity on the bottom of the pump - the converter
Testing for continuity means using a multi meter on the continuity setting - the one that makes a beep when you touch the probes together. You will need small alligator clips to get it on the pins inside the connector. This is quite difficult - because everything is in the way, but in a few tries you will get it. Put electrical tape over one of the clip ends because they cannot touch each other in the recepticle.
Now hook up to your multi meter leads - it doesnt matter which way you hook up the wires to the meter.
4. If it beeps - you have continuity - This means the converter is good. No Beep - No Good
5. Seems impossible to change the converter with pump installed, so now decide to take out the pump and replace the converter or complete pump if you want.
There are several other tests to be made if the pump shows good and still has problems.
1. Check the wires going to the converter - one should have key switch power - other is pulsed ground from ECU.
2. Pressure sensor on top of pump can fail - cheap just to replace - $20
3. If no power to the converter - there is a fuse and relay to check - in the fuse and relay box on drivers side just underneath the windshield - search for Fuel pump relays and fuses and check them all
4. oddball strange possibility - power to converter is on a track with other items, like the oxygen sensor heaters. If one of these is shorted, it will suck all the power out and make your converter not work, as well as anything else on that track.. Check this out if you keep popping the fuse. Checking o2 sensor heaters involves a quick search or Youtube search and you will see how to check both 5 wire sensors - the upstream ones, and the 4 wire sensors - the down stream ones.
Please feel free to add info and fill gaps with your real experiences - good luck.
BTW - telling people to get the manual or VCDS is valid, but rarely helpful.
High pressure fuel pump symptoms - jerking and missing - almost feels like a tranny problem, but it is motor related. Starter will spin excessively before starting.. Will eventually miss and will not rev up.
VCDS scan will show low fuel pressure failure and possibly "open circuit" for the valve on the High Pressure fuel pump.
High Pressure Fuel pump on the VR6 is located up against the firewall on the drivers side - USA. You will see the engine hoisting eyelet - it is next to that.
TROUBLE SHOOTING SHORT CUT - try this first instead of last.
1. Unplug the 2 wire clip from the bottom of the pump - this is the called the High pressure Fuel pump converter.
2. Unplug the 3 wire clip from the top of the pump - this is a pressure sensor
3. Test for continuity on the bottom of the pump - the converter
Testing for continuity means using a multi meter on the continuity setting - the one that makes a beep when you touch the probes together. You will need small alligator clips to get it on the pins inside the connector. This is quite difficult - because everything is in the way, but in a few tries you will get it. Put electrical tape over one of the clip ends because they cannot touch each other in the recepticle.
Now hook up to your multi meter leads - it doesnt matter which way you hook up the wires to the meter.
4. If it beeps - you have continuity - This means the converter is good. No Beep - No Good
5. Seems impossible to change the converter with pump installed, so now decide to take out the pump and replace the converter or complete pump if you want.
There are several other tests to be made if the pump shows good and still has problems.
1. Check the wires going to the converter - one should have key switch power - other is pulsed ground from ECU.
2. Pressure sensor on top of pump can fail - cheap just to replace - $20
3. If no power to the converter - there is a fuse and relay to check - in the fuse and relay box on drivers side just underneath the windshield - search for Fuel pump relays and fuses and check them all
4. oddball strange possibility - power to converter is on a track with other items, like the oxygen sensor heaters. If one of these is shorted, it will suck all the power out and make your converter not work, as well as anything else on that track.. Check this out if you keep popping the fuse. Checking o2 sensor heaters involves a quick search or Youtube search and you will see how to check both 5 wire sensors - the upstream ones, and the 4 wire sensors - the down stream ones.
Please feel free to add info and fill gaps with your real experiences - good luck.
BTW - telling people to get the manual or VCDS is valid, but rarely helpful.
