HELP!!! ASR LIMP MODE S320 - Mercedes-Benz Forum
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#1 (permalink) Old 02-22-2010, 02:33 PM
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HELP!!! ASR LIMP MODE S320

MY '95 S320 has been plagued with ASR limp mode from cold start. I rewired my ETA with military grade wire thanks to v12uburalles.com (wires were unbelievably bare with little insulation). I replaced the Maf sensor and brake light switch. After putting back the ETA, the car has high idle and the ASR light is still on and in limp mode. I'm going to replace the wiring harness but what else should I check? Has anybody been successful in erasing limp mode with a home brew code reader or does the steeler have to reset it with STAR?

Last edited by drcane; 04-07-2010 at 02:04 PM.
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#2 (permalink) Old 02-24-2010, 12:48 PM
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Quote:
Originally Posted by drcane View Post
MY '95 S320 has been plagued with ASR limp mode from cold start. I rewired my ETA with military grade wire thanks to v12uburalles.com (wires were unbelievably bare with little insulation). I replaced the Maf sensor and brake light switch. After putting back the ETA, the car has very high idle and the ASR light is still on and in limp mode. I'm going to replace the wiring harness but what else should I check? Has anybody been successful in erasing limp mode with a home brew code reader or does the steeler have to reset it with STAR?
To do:
-ETA rebuild (maybe its a potentiometer problem)
-Neutral Safety Switch
-Wire harness (doesnt look bad)
-ASR Module???

Last edited by drcane; 04-07-2010 at 02:04 PM.
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#3 (permalink) Old 02-24-2010, 01:28 PM
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You bought a car with ASR, one of the most troubled systems in the history of the company, if not the automobile. I have a 95 S320 w/o ASR and I can't buy a problem - feel like the Maytag repairman. You need to learn how to read the codes yourself, both on the 38 pin and the OBDII - DIY code reading is one of the great strengths on your year/model. A 220 would be out of the flying pan into the fire.
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#4 (permalink) Old 02-24-2010, 09:52 PM
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ETS, electronic traction system, was standard on the 95 S320s, works only throught the brake system, rarely a problem. If you like the 220s go for it.
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#5 (permalink) Old 04-02-2010, 08:19 PM
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Unhappy 3 months gone

Ok guys please some ideas....I've replaced the wiring harness. I've also had my throttle body rebuilt by bba reman. My car still has ASR light and is still in limp mode.

I have been unable to do the relearn procedure as it is obviously in limp mode. Could it be that bba did not do a good job rebuilding the throttle body actuator or the EA/CC/ISC control module N4/1 still needs relearning?....thanks for all your help guys

Last edited by drcane; 04-07-2010 at 02:06 PM.
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#6 (permalink) Old 04-03-2010, 03:39 AM
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Sounds troublesome, I don't know if I can help with anything, but I also have ASR, and it usually sets off just after starting, and I have to restart the car, and it is alright.
Do you hav a permanent ASR light on?

Anyway, I think I read somewhere that ASR is voltage sensitive, and have come to the conclusion on my car that it usually sets off, when the car has been standing for some days, and the battery is a little "drained" (don't know why, but this car drains the battery dry in 7-10 days if left standing).
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#7 (permalink) Old 04-03-2010, 07:23 AM
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Thanks for the response...I thought it was the battery and bought a new one too but no change at all. I usually disconnect it so the alarm system doesn't drain it. Yes I have permanent ASR light from start up.... I will try and clear all error codes and bridge pin 1 and 6 and see if this helps....will post results. By the way porky500 I used to have that symptom before and restart would fix it but now no more so beware it is coming soon....

Last edited by drcane; 04-05-2010 at 03:11 PM.
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#8 (permalink) Old 04-05-2010, 02:50 PM
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Quote:
Originally Posted by drcane View Post
Ok guys please some ideas....I've replaced the wiring harness. I've also had my throttle body rebuilt by bba reman. My car still has ASR light and is still in limp mode.
Ok guys....
I've tried the 1,6 pin jump and it didnt get me out of limp mode. When I clear all the error codes and start the car, the ASR and ABS light both come on, but restart and ABS goes away but ASR is still on...

On PIN 4- HFM SFI Engine control module (N3/4) I get:
DTC 8 CC or EA indicates "limp home" mode
DTC 42 CAN communication from ASR control module(N30/1) faulty.
DTC 45 Fuel safety shut off of electronic accelerator or cruise control active

On PIN 6- ASR/SPS control module N47-1 I get:
DTC 30 ASR only CAN data bus to EA/CC/ISC control module interrupted
DTC 40 SPS P valve Y10 (maybe why my steering is hard? What is P valve?)

On PIN 7- EA/CC/ISC control module (N4/1)
DTC 3 EA/CC/ISC actuator (M16/1) Reference potentiometer (M16/1r1) (voltage supply), Reference potentiometer (M16/3r1), Actual value potentiometer (M16/3r2), Safety contact switch (M16/3s1), Closed throttle position switch (M16/1s2), Actuator motor (M16/1m1), Magnetic clutch (M16/1k1), Reset not accomplished (actuator adaptation).

....I'm beginning to think bba reman didnt fix my actuator or my EA/CC/ISC, ASR and HFM engine control modules are fried? Any ideas guys please would be highly appreciated....

Last edited by drcane; 04-06-2010 at 04:19 PM.
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#9 (permalink) Old 04-07-2010, 02:19 PM
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looks like its the modules

Quote:
Originally Posted by drcane View Post
Ok guys....
I've tried the 1,6 pin jump and it didnt get me out of limp mode. When I clear all the error codes and start the car, the ASR and ABS light both come on, but restart and ABS goes away but ASR is still on...

On PIN 4- HFM SFI Engine control module (N3/4) I get:
DTC 8 CC or EA indicates "limp home" mode
DTC 42 CAN communication from ASR control module(N30/1) faulty.
DTC 45 Fuel safety shut off of electronic accelerator or cruise control active

On PIN 6- ASR/SPS control module N47-1 I get:
DTC 30 ASR only CAN data bus to EA/CC/ISC control module interrupted
DTC 40 SPS P valve Y10 (maybe why my steering is hard? What is P valve?)

On PIN 7- EA/CC/ISC control module (N4/1)
DTC 3 EA/CC/ISC actuator (M16/1) Reference potentiometer (M16/1r1) (voltage supply), Reference potentiometer (M16/3r1), Actual value potentiometer (M16/3r2), Safety contact switch (M16/3s1), Closed throttle position switch (M16/1s2), Actuator motor (M16/1m1), Magnetic clutch (M16/1k1), Reset not accomplished (actuator adaptation).

....I'm beginning to think bba reman didnt fix my actuator or my EA/CC/ISC module N4/1, ASR/SPS module N47/1 and HFM engine control module N3/4 are fried? Any ideas guys please would be highly appreciated....
Ok guys according to STAR TekInfo, and STAR TekInfo the codes suggest I should test my EA/CC/ISC module N4/1, ASR/SPS module N47/1 and HFM engine control module N3/4 using an ohmmeter....I will post results. Seems like I'm talking to myself but hope this will be helpful to someone.... If the modules are bad I hope I can have them refurbished rather than get used ones that would need to be coded by the dealer....at this point I highly suggest nobody should try the 1,6 pin jump....
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#10 (permalink) Old 04-09-2010, 11:36 AM
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UPDATE:
Ok guys I pulled out the modules and the ASR module is bad. It's supposed to hold between 55-65 Ω and it was 21 Ω. The EA/CC/ISC control module N4/1 was ok holding steady at 120Ω. It's supposed to be between 115-125Ω. Looking to see if I can get this ASR unit refurbished or get a replacement....I will check the HFM engine control module N3/4 tomorrow, I ran out of time....where can I get a good ASR module part number 0155455632 ? Bba reman wants $425 to refurbish it. If I get a good used one does it need to be coded by the dealer like an engine module does? Somebody please?

Last edited by drcane; 04-09-2010 at 05:44 PM.
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