Question about 1994 Mercedes-Benz C-Class

Open Question

Controller HFM N3/4 not coding - 1994 Mercedes-Benz C-Class

Posted by Anonymous on

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

When trying to enable phone bluetooth will not go to option


Check for a HFM software update at the dealership

Feb 08, 2016 | 2010 Dodge Journey SXT

1 Answer

Mercedes 320 sport auto tranmision kickdown not responding


There can be an array of problems that can illuminate the EPC lamp on S-Class 220. A few of the most common faults with these are : HFM sensor, turbo or blocked cats. the best way to check the cats are the remove them and tap them on the ground and if dust falls out then the cats are damaged, if OK, you may have to plug into a diagnostic machine.

Sep 06, 2012 | Cars & Trucks

1 Answer

I have changed the MAF sensor on the Korando and it is now running too rich as if the auto choke is still opening. I now have an air temp sensor to fit but cant find it in the air box or ducting. Seems...


i just did a little research on these. being that im from the states i havent had a ton of experience with these but some. the maf you replaced is also refered to as a hfm or hot film mass meter. the air temp sensor is inclusive. i hope this helps.

Dec 28, 2009 | Daewoo Korando Cars & Trucks

3 Answers

1995 Mercedes S 320 won't start. battery is fine


I know on the L.H. (previous fuel injection system) models there was a module called a base module that worked as a big overvoltage relay and powered up all the control units for the engine and drivetrain,they had 4 to 6 10amp. fuses in the top and theywould blow fuses and sometimes fail themselves causing no start conditions. I beleive yours is an H.F.M. system. I used to do roadside and i'm also a mercedes benz tech. The first thing I would try would be to put the car in nuetral and see if it starts. the nuetral safety switches of that era are problomatic. next I would check my brake light fuse in the engine compartment fuse box. That fuse also powers the starter relay-even though it doesn't state that on the fuse schematic. Also to answer your question about a lockout relay-yes there is but they rarely cause a problem. I hope I have been helpful

Jul 06, 2009 | 1995 Mercedes-Benz S-Class

1 Answer

On a 1995 S500 Mercedes , ASR light keeps coming on


yes they can but unlikely-more likely a bad over voltage relay(powers up idle speed computer) or wire harness-your vehicle is probably a hfm type fuel injection they changed from lh that year. find out if it is lh check the fuses in the base module located in the passenger side of the engine compartment under a cover held in by 4mm allen head bolts-alot of times these control units have intermittent contact with there connectors. asr stands for acceleration slip regulation-both isc and asr communicate via can system to monitor throttle position- ea isc cc-idle speed cruise control and electronic actuater(throttle)-hopefully i have helped

Jun 04, 2009 | 1995 Mercedes-Benz S-Class

2 Answers

Power Loss Mercedes 220 cdi '98 Trouble code P1403


It sounds like you have a vacuum leak somewhere between your valve and your source. A common vac leak that occurs on the 220 is at the vac. rubber y located at the back of the intake manifold. Follow your vac. line from the egr to the switchover valve and from the switch over valve to the source. Which is probably the y connecter

May 26, 2009 | 1998 Mercedes-Benz C-Class

1 Answer

Driving car it just quit, will not start back


fuel pump relay behind plastic cover that is behind battery. there are 2 black relays ine is climate control and the other is fuel pump. the climate control will say klima on it. Bridge circuit 30(hot at all times) and circuit 87(consumer) with a fused wire and the vehicle should start if that is the problem. In all honesty it sounds like an ignition problem. I would remove the dist. cap if it is a cis. if it is electronic fuel inj. try wiggling the crank senser harnes and see if it starts. the early lh and hfm cars had major wireharness issues

Apr 12, 2009 | 1993 Mercedes-Benz Mercedes Benz 300 Class

1 Answer

1994 Mercedes C220 A spontaneously switches off when engine cold


early production 202 chasis cars had an updated overvoltage protection relay modification. I beleive it was to remidy a no start condition. From my experience there was a problem with the o2 senser heater circiut that would cause intermittent stalling when cold. There should be codes stored in the engine diagnostic modul even if hfm has not reconized a problem. i would have the scanned for codes. If none present I would purge the intake manifold(clean with special cleaner inducted into manifold via vac, port to remove all the carbon buld up and have the maf senser electrical porion cleaned. It would be a good idea to replace the front o2s with the mileage you have on vehicle.The heater grid is also located internally in the o2 senser. Hopefully you maintain your vehicle and have changed the sparkplugs and fuel filter according to service specs. Good luck

Apr 11, 2009 | 1994 Mercedes-Benz C-Class

3 Answers

1993 mercedes sl300 convertable


Hi,
The early 300 SL suffered from dodgy HT leads and spark plugs if not regularly maintained, the problem with Mercedes Benz though is that the cars have so many features that it is almost impossible to diagnose without seeing the car. Some things to try (in this order) are : - Spark plugs, Ht leads, remove and clean Distributer Cap, replacement of HFM sensor (common fault), if none of these help then faults have been known in throttle valves and fuel pumps/filters

Happy fault finding

May 25, 2008 | 1993 Mercedes-Benz Mercedes Benz Sl Class

1 Answer

EPC FAULT ON A MERCEDES S320 CD1 (2003)


There can be an array of problems that can illuminate the EPC lamp on S-Class 220. A few of the most common faults with these are : HFM sensor, turbo or blocked cats. the best way to check the cats are the remove them and tap them on the ground and if dust falls out then the cats are damaged, if OK, you may have to plug into a diagnostic machine.
let me know how you get on,

bryce

May 21, 2008 | 2003 Mercedes-Benz S-Class

Not finding what you are looking for?
1994 Mercedes-Benz C-Class Logo

Related Topics:

41 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mercedes-Benz Experts

Colin Stickland
Colin Stickland

Level 3 Expert

22306 Answers

yadayada
yadayada

Level 3 Expert

77499 Answers

Joseph Prosser

Level 3 Expert

772 Answers

Are you a Mercedes-Benz Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...