Cdi engine: EPC error: engine dies: Help! - Mercedes-Benz Forum
 
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#1 (permalink) Old 10-12-2009, 05:23 AM
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Cdi engine: EPC error: engine dies: Help!

We have a G400 Cdi, which has an intermittent problem whereby the engine will die suddenly with the message EPC (electronic power control: visit workshop...). This is a dangerous situation as when it happens there is no warning and there is complete loss of power, including steering etc.

Usually, this happens within the first 10 minutes of driving the car and it can sometimes take up to 12 hours before it will restart. In this case, the engine will normally fire up and will then turn off within 3 seconds with the EPC message.

Carsoft diagnostics had revealed DTC errors P2024 and P2001. The first was related to the exhaust gas recirculation valves, one of which we found to be stuck. However, after cleaning them the remaining fault is P2001, which still happens intermitently with the engine dying and the EPC message in the dash.

As mentioned, it seems that the problem occurs usually within the 1st 10 minutes of driving with the following cicumstances:

1.) Mostly, but not always, when driving down hill or with trailing throttle, or sometimes in reverse.
2.)It can take between 1 minute and 12 hours to be able to sucessfully restart the engine. (Engine actulally will restart fine, but only runs for 3 secs before EPC message and P2001 fault indicated.)
3.) After such an occurrance, if the car is used every day, then the fault is much less likely to happen again, until the car is not used for a day or two.
What we have done so far:


a.) replaced all fuel filters
b.) replaced acellerator pedal-position potentiometer.
c.) Checked all other systems (fuel-pressure regulators, sensors etc.)
d.) Checked wiring to ECU etc
e.) Checked and replaced all relevant fuses, swapped relays etc.
f.) Air mass flow sensors were replaced earlier.



Now, it seems that according to the MB DTC codes the following could be relevant to the P2001 error:

P2001 check N3/9 (controller CDI) A/D converter.
P2001 check N3/9 (controller CDI) reference voltage
P2001 check N3/9 (controller CDI) voltage supply 1.
P2001 check N3/9 (controller CDI) voltage supply 2.
P2001 check N3/9 (controller CDI).Circuit voltage supply unit fault
P2001 Component N15/3 (ETC control module) is faulty.
P2001 Malfunction of exhaust gas recirculation (functional chain)(P0400)
P2001 N3/9 (controller CDI) reset identification error
P2001-001 M16/6 (throttle valve regulation part),throttle valve position reliability [P0638]
P2001-002 M16/6 (throttle valve regulation part),PWM-signal:limit 2[P0638]
P2001-004 M16/6 (throttle valve regulation part),PWM-signal interrupt [P0638]
P2001-008 M16/6 (throttle valve regulation part),PWM-signal:limit 1
My question is:

My next point of investigation would be the Throttle regulation valve. But, my main question is does anyone here know whether this would be likely to cause the engine to die completely as it does?

I was wondering whether the problem might be a wiring fault or a faulty ECU, but after many months, the fault does seem to be following a pattern, which would probably be more random and less defined with something like a broken wire or broken track in the ECU printed-circuit boards.

Last edited by Arnie2; 10-12-2009 at 07:28 AM.
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#2 (permalink) Old 10-12-2009, 06:13 AM
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Do not try to complicate the issue by thinking too deeply as you have two very important fault codes and one very important message ie;

P2001 check N3/9 (controller CDI) voltage supply 1.
P2001 check N3/9 (controller CDI) voltage supply 2.

And the message EPC so check the battery and charging circuit first of all as EPC is directly linked to battery power.

If the CDI Controller finds insufficient power it will auto shut down.

ERIC.

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Last edited by eric242340; 10-12-2009 at 06:16 AM.
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#3 (permalink) Old 10-12-2009, 07:24 AM
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Yes, sorry, I forgot to mention that the old battery seemed fine (12.5v), but I did also renewed it, just in case. The two fuses to the ECU wee also replaced and the voltage there measured properly. Of course it could be a problem inside the ECU which causes it to loose power. However, I wanted to eliminate other possibilities first, as the ECU is expensive to replace and requires coding. But, I can't think of many things that would csuae the engine to die in such a way, since most with most faults, the ECU can revert to a "limp-home mode", which keeps the engine running with default values/settings albeit, at reduced power.

I was thinking that the crankshaft sensor might also be a possibility, but that has its own fault code (not P2001) and I believe that its signal is compared to that from the camshaft sensors to detect such a fault.

Loss of power to the ECU, I guess would certainly cause the engine to die. However such an intermittent problem might then be precipitated by bumps and knocks or jiggling the wiring, but these things don't seem to precipitate or affect the fault. The vehicle is sometimes used on rough roads and I havent't noticed that vibration precipitates this fault.

As I mentioned, after the engine is restarted (can take 10 mins to 12 hours), the fault will usually not re-appear if the vehicle is used every day.

This is why I was condidering whether it might be caused by a dirty or sticky throttle valve?

But would this cause the engine to stop, or would it go into limp-home-mode?

Last edited by Arnie2; 10-12-2009 at 07:31 AM.
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#4 (permalink) Old 10-12-2009, 07:36 AM
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In that case you may be correct and the controller is at fault ie

P2001 check N3/9 (controller CDI).Circuit voltage supply unit fault

ERIC.

___________________________________________
"I am enclosing two tickets to the first night of my new play; bring a friend, if you have one."
- George Bernard Shaw to Winston Churchill.

"Cannot possibly attend first night, will attend second ... if there is one."
- Winston Churchill, in response.
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#5 (permalink) Old 11-12-2009, 10:44 PM
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I have same problem on my S400CDI. And it appears only when engine is cold.
Engine starts and cuts off approx after 2-5 sec and EPC appears on the dashboard.
It happens until the engine temperature will rich 40-50 celcius.
I`m keeping pedal pressed little bit to get about 1000-1200 rpm on every cold start.
When engine is hot everything ok.
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#6 (permalink) Old 10-05-2010, 09:20 AM
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Talking Solved for us.

Just to let everybody know, we had the same problem as above. After months of trying to find a solution we finally installed a new engine control unit and guess what! More than a month without any problem! So, if you really don't seem to have any faults in the electronics but have this problem... it might be worth the investment.

Regards,

KJ
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#7 (permalink) Old 11-15-2010, 02:12 PM
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Same problem as yours

Quote:
Originally Posted by R I D E R View Post
I have same problem on my S400CDI. And it appears only when engine is cold.
Engine starts and cuts off approx after 2-5 sec and EPC appears on the dashboard.
It happens until the engine temperature will rich 40-50 celcius.
I`m keeping pedal pressed little bit to get about 1000-1200 rpm on every cold start.
When engine is hot everything ok.
Hi Rider,
I got exactly the same problem with my car as you and would like to know if you solved it (I hope so for both of us).
Can you help me ??
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#8 (permalink) Old 11-10-2011, 02:45 PM
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Quote:
Originally Posted by KJR View Post
Just to let everybody know, we had the same problem as above. After months of trying to find a solution we finally installed a new engine control unit and guess what! More than a month without any problem! So, if you really don't seem to have any faults in the electronics but have this problem... it might be worth the investment.

Regards,

KJ
What was the price of that ECU?

Best regards
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