2002 Golf GT TDI Multiple DTCs

[m50yre]

Hi All, long time since ive been on here but im back! Now with a troublesome Golf!

Anyway, have this 2002 GT TDI, well maintained but slightly high miles @ 136k.

Seems to run fine 99% of the time. The problem i have is that sometimes the turbo just stops, well it fells like that. 800 miles in the past week and its happened 5 or so times, 4 of those times when i was going up hill. Now if i turn the engine on and off all is well again.

I scanned it and have the following errors;

17664 - P1256 Engine Coolant Temperature (ECT) Sensor (G62)
Open circuit/short circuit to B+, 35-10, intermittent

17964 - P1556 Charge press. ctrl.
Value below lower control limit, 35-10, intermittent

16485 - P0101 Mass or Volume Air Flow Circ. (G70)
Range/Performance, 35-10, intermittent


Any hints of where to start with this? I have browsed the net and it would seem wise to get a new MAF for starters?

Cheers!

[Doctle Odd]

It could be sticking turbo vanes or an n75 valve causing the limp mode. Did you clear the codes and rescan after a couple of days?
http://wiki.ross-tech.com/wiki/index...4/P1556/005462

[m50yre]

Hi. No I haven't yet but I will do. What and where is the N75 valve? I have attached photos of my engine. Cheers

[Doctle Odd]

The N75 is on the bulkhead next to the N18 valve which it is almost identical to. The N75 has 3 vacuum pipes all on the same side the N18 has 2 on one side 1 on the other. If possible get some live data using VCDS. No photo you'll find photos on google

[m50yre]

image.jpgimage.jpgimage.jpg

[m50yre]

I only have the system called CarPort not VCDS. Can an evaluation copy of VCDS give give you live data or do you need to purchase a copy?

[Doctle Odd]

Look for the site members with VCDS map and find someone near you. The member will scan your car. VCDS lite won't give you live data

[m50yre]

Cleared the codes today and so far the cars behaved, no loss of power and no return of the faults as yet. When I scan I only get results from the Engine controller and ABS, is this usual? I used vagcom years back on my 80 Coupe and seem to remember seeing lots if controllers being checked, although that was a petrol so maybe diesel is different??

[m50yre]

So the fault has reappeared today several times. Only code there on a scan is

17964 - P1556

[Doctle Odd]

So the fault has reappeared today several times. Only code there on a scan is

17964 - P1556

17964/P1556/005462 - Ross-Tech Wiki