My 1999 E300 is showing an error code of P0700 which is a transmission controller error.
The car sometimes will stay in third gear and is slow to shift to reverse. Turning the car off and re starting clears the problem for a while.

The engine also dies and is hard to start after driving for about a mile when the engine is cold. I know the transmission has some control over the engine power so perhaps it's part of the same problem.

Anything I should check before going to the dealer to be robbed?

This may be something to do with voltage and/or the K40 relay based on the engine dieing while being driven.

You can monitor voltage after its started using the CCU. Press and hold REST for 5 secs, use AUTO buttons to toggle to screen 24. Ought to be +13-13.5V after the GP timer circut turns off.

A high end scanner will tell you what the trans story is; P0700 on OBDii is generic.

__________________
Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

It is a common issue.


K40 Relay
K40 Relay




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__________________
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Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
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1985 300SD
1983 300D
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Thanks for the info.
Is there any info on what all the values mean while using the REST button feature?

I did a search and couldn't find any.

I suggest you focus on the important data until your car is running correctly again.

The problem should be either battery/alternator or K40 relay failing.

I cannot find a module that looks like this anywhere in my car.
Where is it located?

My car will not start at all now. I cracked open the injector lines and there is no fuel getting to the engine.

Everything else seems normal except the front windows do not work as well as the seats but that problem has been there for a while.

The K40 is the front most relay inside the computer box on the right side of the engine compartment.

Open hood, open drivers window, turn key to pos 2. If you hear a click from around the IP area your shut off valve just openned. If you didnt, it didnt, and will never start. Either your K40 or your SOV is bad. Repalce the K40 first because of the other elect glitches you are having now.

Search "SteveBFL" and "AC diagnostics" for what all the other CCU results mean. Mostly pertains to AC temps, pressures, etc.

__________________
Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

Ok. thanks..I found it by checking the part number. It doesn't look quite the same as in the picture.

I sure wish there were test points or wiring diagrams somewhere. I think knowing which wires went to the pump would make it be easier to diagnose.

This car makes me wish I still had the old 240D. It never left me stranded.

You could pull the plug from the SOV and trace back the wires if you wanted. Don't think it will help you any. Or, you could pry the cover off the back of the K40 and look for minute cracks in the PCB pathways that open and close with changes (epxansion/contraction) in temp. You'll need a good magnifying glass; 15 or 20x cause what you are looking for is "really, really" small.

Turning the key to pos 2 and *not* hearing the SOV click open when it is in a no start condition is much easier than either of the above...........

__________________
Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

I replaced the K40 relay and the problem remains.
I did notice that while the engine was cranking there were some air bubble visible in the fuel lines that attach to the back side of the fuel filter. I took the fuel filter off and it didn't appear to be completely full.

With the injector lines loose it still doesn't want to prime. There is a loud click down by the injector pump when the key is turned on.

The windows and seats still do not work after disconnecting the battery for a few minutes and re connecting. This has always been the fix in the past.

I also noticed that the top of of the injector pump looked wet.

Could small leaks here let air into the system and prevent it from starting?

All the other fuel lines look dry.

E300TD air in fuel lines - no start
E300TD air in fuel lines - no start

1998-99 E300 Turbo Diesel Plastic injection pump lines, OM606.962
1998-99 E300 Turbo Diesel Plastic injection pump lines, OM606.962

FYI: here is another common failure/leak item on your model.

1998-99 E300 Diesel Crankcase Breather Pipe kit
1998-99 E300 Diesel Crankcase Breather Pipe kit






.

__________________
ASE Master Mechanic
https://whunter.carrd.co/

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Vehicle build.
Fleet Durability
Technical Quality Auditor.
Automotive Technical Writer

1985 300SD
1983 300D
2003 Volvo V70

https://www.boldegoist.com/

You've not previously mentioned a fuel leak or air.

***Always fix the fuel leaks first on the 606.***

If you have air appearing at either line at the cannister filter you probably have a bad SOV oring. If air appears in the line exiting the bottom of the pre-filter then then one of the 3 orings upstream of that point is leaking.

Invest in a can of brake cleaner and clean everything first. Use the whole can. Clean the fuel filter housing, fuel lines and IP. Then crank and look/feel for your leak.

Fill the fuel tank +1/2. Jack the rear up if the nose is pointed uphill currently.

__________________
Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)