P2146 Fuel Injector Group A Supply Voltage Circuit Open

[Rokstar76]

Hi Guys,

I replaced my supercharger clutch/water pump today.

Namely it used to blow fuses and i got engine code pointing in that direction.

When it blew the fuse it was melting it and i quickly pulled it out.

Now that clutch/pump is replaced and original code is gone but I have this new one P2146 Fuel Injector Group A Supply Voltage Circuit Open.

Vehicle runs rough like on 3 cylinders.

My Golf is 118TSI Mk 6 and done only 18000km.

This car has been a headache.

Your help would be greatly appreciated.

Thank you.

Zak

[Transporter]

Was it running rough before your repair?

[Snail Style]

Would require some investigation. Could be as simple as a fuse, or as involved as damaged wiring/connector/component.

[Rokstar76]

When the clutch/pump blew it went into limp mode and kept blowing fuses. But one could still drive it without the supercharger and up to 3000 rpm. Bit slow to take off but drive-able. Last time I drove it the fuse for the sc clutch/water pump started melting and after that I quickly pulled it out. Next time I started the car it was running rough. I changed the SC Clutch/ Water pump and that part is now working ok. Codes are gone for that issue. But since fuse melted I have new code P2146 Fuel Injector Group A Supply Voltage Circuit Open and is running rough. ECM llight is on.

[Rokstar76]

Thank you

[Rokstar76]

Ok So after lifting the fuse box under the bonnet. There is smaller black box with pink bits that slides out. Underneath it are cables. One blue cable has blistered and showing wire. So fuse melted this. Not sure what this component is??? I believe it plugs directly in ecu.

[Rokstar76]

Jesus this thing goes in ECU, in the dashboard and towards headlights and beyond. I decided to open the cluster of cables to see where exactly this wire goes and to see if i can replace just the wire. The blue wire seems to be blistered and showing threads most of its length so far some 30cm that i have freed. I have a gut feeling it goes towards the engine given the code that popped up. But then again these things are temperamental! Any advice is greatly appreciated. Cheers.

[Snail Style]

Show a picture of the wire, which fuse it goes into etc and details on the car, then should be able to give you an idea where it goes. Most likely this will be your problem however.

[Rokstar76]

Hi mate,

First of all big thank you for trying to help.

2010 VW Golf TSI 118 comfortline/twin charged

Please see pictures below.

My finger is pointing to the fuse location which is the supercharger clutch one. The one with a missing fuse.

Wire runs the entire length from fuse box to the jack below the headlight and i have improvised with a wire which has red insulation tape. I tested it after improvising but still getting the same code. Getting a multimeter today to test connections relating to this wire.

[Snail Style]

Need the number next to the fuse mate

[Rokstar76]

Hi Mate,

I got a multimeter yesterday. Checked the plug with 14 pins and all good there, wire i improvised is also good, wiring at the bottom of the fuse box also good and transferring to the fuse box. Fuse box dead. I put the fuse in and no reading on that particular transfer. Others work but that particular transfer doesn't. It makes sense that should fuse fail as it did that next in line is fuse box. Ordered a new one from VW $140. Got rammed as another dealer interstate wanted $90. Anyway if it works I am still ahead by changing the supercharger clutch/water pump on my own even with buying tools and fuse box. They said 4-5 days to arrive. I hope to have it by the weekend so I can finalise this agony. Will keep you posted. Cheers.

[Rokstar76]

Fuse is F21.

Update, replaced the fuse box and its not the problem. Checked wiring and i am getting 12 volts on all four wires on all four coils. When i start the car i can hear supercharger engage and for a brief second the EMC light goes out but comes back on. Same code. The wires are heading to the ECU so i shall trace conectivity to the ECU. I have a feeling that this may be where the problem lies. Faulty fuse may have toasted it. Any help would be great! Thank you.

[Rokstar76]

Ok so I have replaced the blistered wire with a new one. Also at the 14 pin jack i have isolated the two wires that go to the supercharger clutch. Blue/white and purple/red. When i run a multimeter they are both ok at the other end, supercharger clutch end. What is bizzare is that what appears to be two wires disconected from each end yet the blue one seems to connect with another red/gray one. So what i did was cut the blue/white wire at the 14pin connection to ensure that there is no short circuit there. There isnt. Traced the blue/white and red/purple wire further up towards the engine and right there i poked a hole in a red/gray wire and the other multimieter spike i poked the blue white wire and it beeped as if it was the same wire. Now i am thinking if fuses are out and blue and white wire is disconected at the 14pin jack and at the supercharger clutch, this wire would have no connection to anything. Well it does. Now I am thinking that it melted somewhere in the tubing around the engine and connected with another wire hence this result. I am struggling to think how it can be anything else given it is disconnected. A thing in the ECU may be the cause if fuses were in and fuse box connected to the lower part and plugged in at the other end but no its just a wire disconnected from a to b. This is bizzare. Old man was auto sparkie so i learned a thing or two, but this blows my mind. It appears that there is shotcircuit somewhere in the harness.

[Rokstar76]

Problem solved! Couple of wires fused in the engine harness right underneath the manifold! Replaced burned wires, insulated every other wire, some 50 of them, tested, started, no lights on dash, no codes, works perfect. Maybe I should have bought new harness but don't really want to give money to the vw after the cheat. Needless to say this is my first and last vw. Merc or Bmw is next and if that is too much a Toyota is a safe bet. Thanks for your help guys, this is a second solved issue I shared. Good luck.

[AdamD]

Nice work! Persistence pays off.