Jeep wj 2.7 crd obd codes

[pcn1]

I can't read the fault codes on the dash using the key on/off 3 times and hold the 4th on. (I'm coping what I see on YouTube)
It just reads the mileage still. Does that mean there ain't any codes or I'm doing it wrong ?

It's just she didn't fire up this morning after 5 days of not being used, but spins the engine over easy. And this is after 18 months of complete reliability since I fitted a new battery. I'm looking for clues as to why.
Maybe the short journeys I've been doing lately have depleted the battery voltage a bit so it's on charge now.

Cheers

[jay140285]

Generally if your doing the cycle correctly and the mileage is coming back up then no codes are stored.

Have you pulled the battery to re charge it, having it off the Jeep for an hour plus can help something. They do like a well functioning battery.

[pcn1]

I charged it for an couple of hours, and it still didn't fire up.
But I tried a few more times and she fired into life and has been ok since.

I really don't think there was anything wrong with the battery.

Is there any benefit of letting a diesel specialist (Bosch service Centre type place ?) do a diagnostic of the system ? Is it all on the laptop these days, what exactly can they test and verify is ok ? What should they be testing ?

Can we look at a 10 year old 2.7crd with 75K on the clock and say they all need new ????? at this point ?

Cheers

[scrwright]

you can read some basic ODBC code with a cheapo scanner tool, IIRC anything that appears on the dash can be seem by a scanner. From experience none starts without codes tend to be crank sensors.

[pcn1]

Is a new crank sensor a "plug and play" item ?

[jay140285]

http://youtu.be/7D0vUEDSwXo

[pcn1]

scrwright said:

you can read some basic ODBC code with a cheapo scanner tool, IIRC anything that appears on the dash can be seem by a scanner. From experience none starts without codes tend to be crank sensors.

I may have no option but to just keep checking the dash codes every morning to see if some thing finally does show up. Or I buy a new crank sensor and replace it and see what happens. Need a part number and price now !!

Is there any worth in a home OBD reader, will it tell me anything the dash wont ? Last time I asked years ago word was they weren't very good unless you spend a lot on one.
Unless that's changed now ??

[raywillden]

I can't help with the codes, but I had an ML270 CDI with the same engine and the same problem. It was a set of small o-rings in the low pressure fuel lines which were failing and sucking in air bubbles to the point that not enough fuel was getting through to start. It was fine when it was running, but took a few goes to start...

These are what I used, it completely solved the intermittent starting.
http://www.ebay.co.uk/itm/Mercedes-Benz-CDI-diesel...

[pcn1]

Ray, thanks for the heads up, all help welcome.
Where do these o rings go, on the fuel rail ? I've never played with diesels before and don't want to do damage touching stuff I don't understand. So are they an easy fit for a home spanner man ?

[pcn1]

Maybe I should get a dummies guide to Diesel engines !!!!

[scrwright]

air in diesel lines, what a PITA that can be. Wifeys KJ CRD has issues with it, fitted an electric lift pump in the end as the manual pump never primed the system correctly. Manufacturers relying on pump vacuum to lift diesel 10 ft from a tank always seems a money saving exercise