Maf wiring / troubleshooting

4.2 V8 40v biturbo - 450 bhp
4.2 V8 40v biturbo - 480 bhp (plus)
Post Reply
Gavinda
1st Gear
Posts: 81
Joined: Thu Sep 03, 2015 9:33 am

Maf wiring / troubleshooting

Post by Gavinda » Thu Jun 25, 2020 9:34 am

So I've been trying to log MAF values using me7 or vag-lite and not getting a good connection but values bank1 much lower than bank2 , this lead me to inspect the Mafs and check the wiring.. mafs both good as tested on a 1.8t . Input voltage is low ~1.8v where it should be 12v? Green/yellow striped wire., no codes and runs , although feels a bit slow (6+secs to 60 ,tested it as it had been a while in the 6 so I forgot what it shud feel like🙈)
Any help appreciated- is the 12v in the engine loom coming from a particular relay?
Someone help me with wiring diagram., Elsa wont open its too big for my hard drive🤡

Gavinda
1st Gear
Posts: 81
Joined: Thu Sep 03, 2015 9:33 am

Re: Maf wiring / troubleshooting

Post by Gavinda » Thu Jun 25, 2020 9:04 pm

Ok so I got Elsawin running , and it appears the wiring leads from d22 fuse 234., (28, 32 , 34) which are fed from the fuel pump relay .

Gavinda
1st Gear
Posts: 81
Joined: Thu Sep 03, 2015 9:33 am

Re: Maf wiring / troubleshooting

Post by Gavinda » Sat Jun 27, 2020 6:55 pm

Voltage at the fuses was very low and bypassing the fuel pump relay restored the 12v at the Maf so new relay ordered and on to the next issue as some codes showing now

User avatar
Shoppinit
Cruising
Posts: 19798
Joined: Wed Dec 31, 2008 6:24 pm

Re: Maf wiring / troubleshooting

Post by Shoppinit » Sat Jun 27, 2020 7:11 pm

That's a weird failure. Unfortunate.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."

Post Reply

Return to “RS6 / RS6 plus (C5 Typ 4B) 2002-2004”

Who is online

Users browsing this forum: Shoppinit, srichards, steve2003rs6 and 411 guests