Testing Wiring and Earths for EGR fault T5 2010 Feb 2.0 CAAC 103kw 6spd man

[aSimpleLife]

Making a separate post just for this, hoping someone can help me with some shortcuts.

Before removing the EGR valve to clean or replace, seems like a good idea to first check for wiring or earth faults?
Found this very good video, for a similar vehicle and faults, but it has done more to scare me off than help

The only wiring diagrams/technical manual I have is this book;
"Haynes VW Diesel Transporter Jul 2003 to 2014 Owners Workshop Manual"
It looks to be inadequate for this purpose?
(compared to my earlier simpler AU falcons, where I have a 3 binder ford manual, 1 being for electrical diagrams)
There is only 1 page for the "Starting and Charging Systems".
With no mention of EGR connections and sensors.
There are alpha numeric references to unnamed objects. But no cross reference table to look them up?
There is also barely a mention of the EGR in Chapter 4 Part C: Emmission Control Systems.
Can I get access somewhere to a better workshop manual?

What wiring should I be checking?
Assume I should try to find every earth in the engine bay and check that?
Next would be the connector to the EGR?
The Exhaust Temperature Sensor and connector should be checked. As that has been replaced previously to resolve and engine or coil warning light.
Is there anything else I should be checking?

My engine warning light is currently on and I have this fault code;

4900 - EGR Sensor 1 P0405 00 [175] - Signal too Low
MIL ON - Confirmed - Tested Since Memory Clear

I did a reset and expect this fault code to return eventually;

4881 - EGR Valve (N18 ) P1440 00 [032] - Open Circuit
Intermittent - Not Confirmed - Tested Since Memory Clear.

I also seem to have a 5 second turbo lag which may or may not be related to this?

[MIG]

The factory manuals would be your best bet, here is my reposted guide on getting them.

"erWin has the manuals, wiring diagrams and TPIs, which costs ~7 euro for an hour.
Official Factory Repair Information - Ross-Tech Wiki

erWin checklist (suggested):
- Subscription to erWin Factory Repair Manuals
- Vehicle VIN number
- Some hard drive space
- I use a 'print to pdf' or CutePDF Writer

The site can be hard to navigate but has tons of info, download it all "


A good multimeter, test lamp and T pins (to back probe connectors) are a must when looking for bad grounds and powers.

Each of those sensors will have a power and ground feed, once the wiring diagram is sorted check each of them.

[aSimpleLife]

Thankyou very much for the help. Along with the electrical pointers, I've now got the workshop stuff I needed. Haynes certainly pales in comparison. Was ok back in the 1970's I suppose...but since then it's been an explosion in complexity.
Have ordered a few cheap tool bits and pieces I need for the electrical testing and failing a solution there, removing and cleaning the EGR.
I'll return now to my main thread.
Can I salvage anything from my T5 train wreck