94 E420 Throttle actuator installation - Page 2 - Mercedes-Benz Forum
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#11 (permalink) Old 03-23-2010, 11:54 PM
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My ETA is in remarkable shape from my inspection, may have been replaced but i doubt it considering the coils were original with dated 1992 stamp. I replaced the wiring harnesses. My ASR has had simple issues like the throttle cable was too tight which I acted like the pedal was pushed when it wasnt which engaged the limp home mode. Once I released the tension been good ever since.
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#12 (permalink) Old 03-24-2010, 04:45 AM
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Originally Posted by jse420 View Post
How much do these go for at the stealership?
Non ASR units retail for about $1200 at the dealer. ASR units for about $1000. My dealer works well with me. I puchased a new upper wiring harness & the ETA for $1250 out the door.

Good Luck,

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#13 (permalink) Old 03-27-2010, 07:58 AM
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Unhappy

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

1994 E420

Last edited by e420man; 04-03-2010 at 01:14 PM.
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#14 (permalink) Old 03-27-2010, 08:02 AM
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here is the ETA M16/1 wiring diagram
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1994 E420
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#15 (permalink) Old 03-28-2010, 01:09 PM
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Here is a short video about the unstable idle 15 seconds after the engine start.
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

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#16 (permalink) Old 03-28-2010, 04:21 PM
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How about the throttle cable? Back off the adjustment screw some, I know sounds weird but try it, a little slack. Also the switch for the gas pedal itself.
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#17 (permalink) Old 03-28-2010, 08:10 PM
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where is the gas pedal switch?
Is this knob that I should back off?
Thanks!
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#18 (permalink) Old 03-28-2010, 08:14 PM
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Yes if there is no slack in the cable. I have actually fixed 5 MB's ASR with just that. Its like holding down the gas pedal on start and that will trigger the ASR.
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#19 (permalink) Old 03-28-2010, 08:40 PM
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well, just tried it... no luck. looks like more than the adjustment.
Code 2 on pin #7 shown;
*EA/CC/ISC control module (N4/1)
*safety contact switch (M16/1s1)
*Stop Lamp switch (checked and it is okay)
*Cruise control switch
*Actual value potentiometer
*Starter lock-out/back-up lamp switch (S16/3)
*Engine speed signal or Vehicle speed signal
*Closed throttle position switch
*Safety relay in EA/CC/ISC control module
man.... so many possibility! Too bad that I don't have a better scanner (just a home made LED and a useless Carsoft 7.4 Chinese clone unit)

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#20 (permalink) Old 03-29-2010, 02:07 AM
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Gas pedal switch is in the area behind/underneath the gas pedal. Your car is actually "fly by wire" the cable handles almost nothing really as the throttle actuator does the work. Did you check the throtle actuator for bad wires inside? The wiring in there is the same as the wiring harness upper/lower. Any shorts in those 3 pieces and youll be chasing this forever.
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