94 E420 ETA ASR Throttle actuator rebuilt not working - Mercedes-Benz Forum
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post #1 of 62 (permalink) Old 03-29-2010, 07:46 PM Thread Starter
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94 E420 ETA ASR Throttle actuator rebuilt not working

Not so good news... finally got the rebuilt ETA installed but result still the same. ASR can not be reset, go into LHM
dump DTC and the following was shown;
Code 2 on pin #7 EA/CC/ISC control module (N4/1)
and
Code 30 on pin#6 CAN data line to EA/CC/ISC module (N4/1)
No fault codes on the other modules
Open F23 box remove all modules check CAN bus (120ohm) all looks very clean
I've removed the ETA connector and measured the resistor values on the ETA here is the result;
Before send out to BBA for rebuilt:
pin 11,4 (motor) shown 1.4 ohm
pin 14,3 shown 1174 ohm
pin 14,1 shown 1288 ohm
pin 3,1 shown 1312 ohm
pin 8,6 and 8,10 shown open circuit
pin 6,10 shown 355 ohm
pin 12,13 shown 4.3 ohm
pin 2,3 shown 1806 ohm
pin 2,14 shown 929 ohm
After return from BBA:
pin 11,4 (motor) shown 4.3 ohm
pin 14,3 shown 1171 ohm
pin 14,1 shown 1295 ohm
pin 3,1 shown 1189 ohm
pin 8,6 and 8,10 shown open circuit
pin 6,10 shown 348 ohm
pin 12,13 shown 4.1 ohm
pin 2,3 shown 1574 ohm
pin 2,14 shown 701 ohm
After Installation and tried without success:
pin 11,4 (motor) shown 1 ohm
pin 14,3 shown 1172 ohm
pin 14,1 shown 1534 ohm
pin 3,1 shown 591 ohm
pin 8,6 and 8,10 shown open circuit
pin 6,10 shown 348 ohm
pin 12,13 shown 3.9 ohm
pin 2,3 shown 1568 ohm
pin 2,14 shown 693 ohm

I hope someone could help with the above information before I remove and return the unit to BBA for warranty or start changing the ABS/ASR control module and the EA/CC/ISC module

Please see my other post with video and pictures: https://www.benzworld.org/forums/w124...ml#post4063521

As you can see from the video that the ASR light remain ON.

Drove the car for 10 minutes... run in limp home mode
* New engine wiring hardness
* Battery voltage 14.05VDC (when engine running)
* Remove and checked brake light switch, it is in good operating condition

Please HELP!

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post #2 of 62 (permalink) Old 03-29-2010, 09:30 PM
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Remove the ASR relay and see if thats the issues, its under the screwed down cover behind the fuses if I remember. There should be a sensor on the rear end for sensing wheel speeds across the axles. I personally have not seen this as this big of a problem but I havent seen it all either. People have said when ASR has problems it becomes a big issue fast.

Did you check the variable potentimeter for the accelerator like I mentioned before?
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post #3 of 62 (permalink) Old 03-30-2010, 09:04 AM Thread Starter
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Is it the kick-down switch that you've referred to?
The one circle in RED?
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post #4 of 62 (permalink) Old 03-30-2010, 01:36 PM
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Yes.
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post #5 of 62 (permalink) Old 04-02-2010, 05:32 AM Thread Starter
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More testing on the ETA unit

More testing on the ETA unit with video. As we can see from the video that the butterfly doesn't seems responding at all in all 3 tests.
There are 3 separate tests in this video;
1st- Ignition ON, start engine, accelerate (see throttle link on the left moves), release pedal and stop
2dn- Ignition ON, start engine and stop
3rd- Hook-up DTC reader then Ignition ON, ignition OFF, Ignition ON


Any comments?

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post #6 of 62 (permalink) Old 04-02-2010, 08:16 AM
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Well the signal that tells the motor inside there to move is not working. I would say ASR is a culprit if you have it. If you do pull the fuse as ASR does just that to power down the engine. Both your posts have grown quite large but did you ever say if you replaced the lower wiring harness?
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post #7 of 62 (permalink) Old 04-02-2010, 08:27 AM Thread Starter
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Just remove and check the kick-down switch and it seems working fine. Contact normally closed then when pressed down contact opens.

I've wiring hardness replaced, the set that going to the MAS, injectors, F23 box... the set that is on top of the engine. Where is the lower wiring?
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post #8 of 62 (permalink) Old 04-02-2010, 08:56 PM
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did you re-set actuations after installing the new unit?


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post #9 of 62 (permalink) Old 04-02-2010, 09:43 PM Thread Starter
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Yes, I did "try", however as soon as I start the engine the ASR was already on. Tried to reset codes, but it came back right after I start the engine... so no chance to make the re-learn sequence at all.

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post #10 of 62 (permalink) Old 04-02-2010, 11:13 PM
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The lower wiring harness goes to the alternator, oil pressure gage, oil level gage and such. If it hasnt been dealt with can be grounded out.

Have you tried pulling the fuse for the ASR?

If the ASR is keeping it from opening at least you know. Maybe the ASR module from years of bad wiring grounding is just wore out.
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