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View Full Version : TD5 sluggish - MAF/EGR issued solved


CowsGoMoo
13th January 2009, 09:46 PM
My Discovery TD5 has been a bit of a slug lately. I changed the MAF and found it made no difference. Nanocom showed a flat line for the airflow before and after the change.

Also, there was a constant fault present-

FAULT 01-07 EGR vacum modulatore schort citcuit CURRENT
(Nanocom spelling btw)

The EGR Modulator graph in the Nanocom fuelling was also showing a flat line.

After a trip to Stockton on the weekend (those soft dunes were not friendly if your missing some power ) I decided to get in and have a closer look at the problem. When checking the RAVE Engine Management (TD5) circuit diagram (page 20.1) I noticed that the following items are fed from Fuse 2 in the engine compartment fuse box-

-Throttle - EGR Inlet
-Modulator -EGR
-Sensor - Mass Air Flow
-Solenoid - Wastegate Control

Checked Fuse 2 (15A) and sure enough was blown! Fuse replaced and Disco is driving much nicer. Heaps more power down low and smoother to drive. :D:D:D

And it only took 5 minutes and a 50c to fix. :p

Not sure what caused the original fuse to blow. Maybe the original MAF sensor. I'll keep an eye on it anyway.
Graeme
14th January 2009, 06:26 AM
The wires that run across the front of the head to the MAF etc can short due to the plastic wrapping disintigrating thus causing the fuse to blow.
CowsGoMoo
14th January 2009, 10:02 AM
The wires that run across the front of the head to the MAF etc can short due to the plastic wrapping disintigrating thus causing the fuse to blow.

Thanks for that. When it get a little cooler I'll take the cover off and have a check.
Shaker
29th January 2009, 06:31 PM
Dammit, dammit!

I have the same symptoms, just plain sluggish, went out checked as soon as I read this, damn fuse is fine!
Tombie
29th January 2009, 06:38 PM
check your fuel pressure, waste gate for sticking and boost modulator valve.
Shaker
29th January 2009, 06:41 PM
check your fuel pressure, waste gate for sticking and boost modulator valve.

I have checked that the waste gate isn't seized, obviously fuel pressure needs diagnostic equipment, but pardon my ignorance how do you check the boost modulator valve ... and where is it?