I get that a lot... Use the GPH gauge and you can see it hit 0.0gph when you are off the go peddle going down hill... Mine shows Cold idle as 0.4gph and Warm idle as 0.2gph... Steady driving on level roads around 50mph will give you mileage in the 40s.. :)

I think the injection pump completely shuts of the fuel when coasting which would theoretically push the economy to infinity for a period of time.

Hi

I bought a ScanGuage off ebay and have just realised that my 1998 E 300 Turbodiesel does not have an OBD II port. Just the 38 pin Mercedes port. Does anyone know if you can get an adapter and more importantly will it work?
It was only in USA that they became standard in 1996 not Europe. In case anyone makes the same mistake.

McCool300TD

Hi

Does anyone know what wires are common to the 38 pin plug and the OBD2 plug so i can retrofit an OBD2 plug to a 1998 E300TD to get this ScanGuage working, is there a gateway module between the 38 pin and the OBD2 plug???. Even if someone with a 1998 could PM their VIN i could try and access the part no. through the EPC.

Help would be appreciated.

McCool300TD

I never would have thought that they'd omit OBDII from the cars for the european market but I guess you'd know better...chalk that up to the "learn something new every day". I guess I just assumed OBDII became the universal standard for all cars. Hmmm. What exactly do you have in the place where the OBD plug is on our cars?

I think OBDII is just a set of pins on the ECU. Could they possibly have a totally different ECU/harness for Europe? A wiring diagram would be helpfull for a side-by-side comparison...

Hi

I hav 38 pin connector in the fuse box and a blank space where the OBD2 should be.

Got the ScanGuage today and i am currently trying it out with the OBD2 adaptor.

McCool300TD

Hi

I does not work mpg can be fiddled about with prob to make it accurate. i doesnt give boost pressure and the RPM is too low approx 157 ticking over. Speed is totally wrong too. Seems like a great toOl if it would work properly. I doubt i need to get connected to a few more pins or whatever.

McCool300TD

Hi

After a day of playing with the ScanGuage i so so much want to get it to work. Can someone send me the wiring diagram of a USA spec E300TD do i can figure out where the OBD2 gets its feed wires. Come on guys i need help here.
Rpm is 1/4 of what it should be. MPH is crazy 159mph reversing out of the garage. Boost is 37.4 MPA at all times. It connects ok just gives crazy readings.

Anyone??

McCool300TD

Have you tried contacting the manufacturer...they do have some tech support online and by mail or phone that might help you.

http://www.scangauge.com/contactus.shtml

The OBD2 port uses the 'K-line' output from the 38-pin connector as the data input (pin 7 on the OBD2 connector). I am fairly certain that this pin mapping will work for you:

Please note: This will only work for 38-pin diagnostic ports that support digital formatting (pre '95 will not work)

Hi

The 38 pin to OBD2 adapter i have at the min uses pins 1,3&4. Not sure which pins they go to on the OBD2 its a moulded plug and i dont want to cut it open. Should i swap the wire currently on 4 to 15? Is that likely to damage the ScanGuage if it is wrong?

Thanks for your help.

McCool300TD

Hi

Update: I swapped pin 4 for 15 on the 38 pin plug and the ScanGuage wouldnt conect at all. What now??

McCool300TD

Sorry for the bad info but you're pin-4 specification matches the diagram on AllData - I got the pin-15 info from a 38-pin diagnostic port to OBD2 cable specification.

I just went on a trip to Pittsburgh this weekend, and was checking the miles on the guage. It showed I averaged around 48MPG, and also showed I had about 500+ miles til empty, however my fuel gauge said otherwise. At about 600 miles on the actual odometer, she was about dry. Unfortunately I have yet to be able to get an accurate MPG reading on one of these scan gauges. I love mine, it has many many uses, I just wish MPG was one of them. :(