190e 2.6 1991 (M.B. Doc any help??)
 

Hi,

I just get the w201 shop manual cd online. I need it to perform the troubleshooting procedure on my idle air control valve...

The m103 engine on the cd is for an older version 1987, at that time the OVP was supplying battery voltage to the IACV and they do not have MAS realy but fuel pump realy, the CSI was a 25 pin instead of a 50 some pin like mine.

On a 190e 2.6 1991 the the OVP (pin87L) feed the CSI and then the CSI feed the IACV, on mine the voltage isn't 12 volts, anyone know what the voltage should be.
Does the voltage change when the engine warm-up??
Anyone know or have the procedure to be perform on this model to check the IACV.
The IACV work well if I apply 12 V on it.

My other question is, my crank sensor read 500ohms (Hot or Cold) the specs say 680 to 1200 ohms... Should I replace it???

I' m after a Sudden Stalling Syndrom at -15 to -20 C°

Max

Duty cycle or milliamps

On/off
 

Outside temp -10C°
Battery voltage = 12.5 volt

On/ off at the x11 socket

Between terminal 2 and 3

Cold
On/off
6 to 7 volts

at 80C°
no on /off
reading = 10 volts

At 85C°
On/off
9 to 10 volts

IACV
2 volts cold or hot

Is this normal???

Max

On that & most M103's the idle control is measured as a duty cycle.

In other words the current to that valve is a constantly changing voltage.

Should have a 30% duty cycle at the valve.

duty cycle
 

Hi M.B. Doc

If mine do not cycle but has always 2 volts what is wrong CSI or MAS ???

Again the car stall only when the weather goes below -15/-20 C°, engine temp at +/- 80C°, deceleration before turning, hard to start after, have to wait +/- 15 minutes sometimes idle up and down when I start it back, put in gear stop boncing....

Thanks for your help

Max

To get a proper measurement, you either need an oscilloscope or a meter that reads duty cycle. If your voltmeter is averaging accurately, then 2V would be close to a duty cycle of 2/12 X 100 = 17%. However, that is assuming a lot. Best to get the proper meter.

Steve

Duty cycle meter
 

Hi Sbourg

I have 3 multimeters none seams to be able to read duty cycle.

-An old analog

-Blue Point model EEDM504 A

-Digital C-266

Any cheap dmm I could buy to do this duty cycle test ???

Thank for your help

Max

oscilloscope or the tools such as the modius by snap on can measure duty cycle

Sears has a nice one for $20...Duty and Frequency...

Look it up inder DMM..if you can't find it, I will go out to the shop and see the model #..but I don't want to get dressed, so try Sears site first..

Had another one in the house

Sears/Craftman Auto-Ranging DMM Model# 82139.

May be upgraded w/newer model...good tool for the $$$$$

See then on eaby for short $

http://www.peachparts.com/shopforum/tech-help/50818-can-someone-recommend-good-basic-voltmeter.html?highlight=82139

Sears multimeter
 

Thanks Dalton for the info....

Sears Canada offer only Fluke meter :(:( No crafsman multimeter...

Sears US have the meter in stock but do not ship to Canada:mad:

So I think I'm stock with the Ebay process... Bid--- Wait---Pay + high shipping--- wait for delivery, almost a 14 days process:D

Anyone have one spare, if you ready to ship it to me, let me know....

Thanks again

Max

I did not know they did not ship to Cnd....

Try Radio Shack..they have then too...


Or...you have an old Dwell Meter ???? ...you can do duty with them too....Archieves has that info................

I have a Dwell Meter....Thanks Arthur, I'm going to research this!

Dave

Canadian Tire DMM
 

I find a canadian tire DMM on there site who do duty cycle, it was advertised at 59.99cdn here's the link:

http://www.canadiantire.ca/browse/product_detail.jsp?FOLDER%3C%3Efolder_id=1408474396672790&PRODUCT%3C%3Eprd_id=845524442202151&bmUID= 1231359314548&assortment=primary&fromSearch=true

So I was ready to pay that price, I drive to the nearest store and pick one. When I get to the cash the girl say, you're lucky this item will be in sale tomorrow, I'll give you the special price 24.99 cdn, do you need a batterie with this?

Yes sure...:D:D

Here's the test I do with the DMM

Duty cycle test:

Outside temp: -1C°

Engine cold:

diagnostic socket X11 (9pin round socket)
Pin2 ground
Pin3 red

49% no on/off

IACV: 72%/73.6% on/off

Engine at 50C°:

Diagnostic socketX11:
62%/68% on/off

IACV: 72%/73.6% on/off

Engine at 80C°:

Diagnostic socketX11:
62%/68% on/off

IACV: 72%/73.6% on/off

I do not unplug the IACV to do the test.

Since none of my shop manual or cd have the procedure for m 103 1991 2.6. the procedure in my book are for model without a MAS realy. The only thing I have is a wiring diagram for my model.

Who know what those result mean??

Anyone have the procedure for my model ??

Thank for you help

Max

Duty Cycle + 16 pin tdc 190e 2.6 1991
 

Hi

I read a lot yesterday night on the board and find out that mercedes don't use the on time but the off time for duty cycle test.

True or False???

So I redone the test today, instead of using Pin 2 black wire and Pin 3 red wire from my meter I reverse polarity and I did the same for Idle Air Control Valve here's the result:

-Diagnostic connecter X11 (9 Pin Round)

Pin2= Red wire
Pin3= Black wire

Engine Cold:
50% no on/off

-IACV
at the connector of the IACV

Pin2= black wire
Pin1= red wire

23.5%/24.5 %duty cycle

Engine at 50C°:

23% / 28% on/off

-IACV
at the connector of the IACV

Pin2= black wire
Pin1= red wire

25% / 26%duty cycle

Engine at 80C°:

25% / 29% on/off

-IACV
at the connector of the IACV

Pin2= black wire
Pin1= red wire

26.9% / 27.2%duty cycle

Is this result normal????

I also built a pulse tester following the design form Arthur Dalton.

I'am having a 16pin diagnostic connector next to the battery.

Here's the results:

Pin1= Black wire
Pin3=Orange wire
Battery(+)=Red Wire

Ignition ON
Engine OFF

Push the botton 2 sec. and release, the light start to blink...

code18

If I refer to the table publish on the board, code 18 is "Current to Idle Control Valve is Illogical"

Do I perform this test the right way???

If yes what's next???

Do anybody know what the other pin in the 16pin diagnostic connector are for???

I have wire in pin6, pin7 and pin14 the other pin are empty.

Thank for your help

Max

http://www.geocities.com/MotorCity/Downs/1039/mercedes/cs1000_mb.pdf

Page 23 and 27.

Illogical power code 18 can very well be a bad OVP relay.
ABS lamp ON???

No ABS light on
 

Hi Arthur

Nope, no Abs light on.

Thank for the code reader design.:D:D

First, how should I perform the duty cyle, normal polarity (pin2 black wire, Pin3 red wire) or inverse polarity (Pin2= red wire pin3= black wire) ???

Please take a look at two duty cycle test I do. Which one make sense with the code 18 ???

Do I perform the test right with the code reader ?? If I do not put the ignition on I can't read nothing, the 1pulse= no fault doesn't show.

What else could cause a code18 ???

Thanks for the link to the code page. I find it yesterday night and do the test today.

By the way the page 28 say the pin14 is for the MAS controller(201-029, 1990-92) when I try the code reader on pin14 (orange), pin1 black and red to battery(+). I can't read code the light stay on all the time, should I turn the ignition Off ???

I might try this later on tonight.

Max

MAS code 4 and CIS-E code 18
 

190e 2.6 1991

I was able to find a test procedure for code 18 from the Cis-E control module.

Code18 = Current to idle speed air valve(Y6) illogical

Here it is:

Check current at IACV (Y6)

Engine at idle: 600 +/- 50 mA

A/C switch on: +/- 50mA higher than before with a/c off

Drive position selected: +/- 20mA higher

Out of range = Open circuit to idle speed air valve (Y6) or idle speed air valve (Y6) or CIS-E control unit (N3)

Check resistance at IACV (Y6)

Ignition off

Connectohmeter at the control valve on pin 1 and 2 reading should be 7.5 to 10 ohms

Out of range = Replace IACV (Y6)

Check Wiring

Ignition off

Unplug connector from CIS-E (N3)

Mesure Ohms between pin 23 (N3) to pin 1 (Y6) less than 1 ohm
Mesure Ohms between pin 4 (N3) to pin 2 (Y6) less than 1 ohm

Out of range= open circuit

I perform the test on my 190e and everything was fine. I probably get this code because I unplug the IACV (Y6) to see if the idle will raise.

Don't forget erase the code with your code reader after you perform the test.

MAS (N16) code reading:

I was able to retreive code from pin14 on the 16pin diagnostic connector(X11/4) .

I retreive a code4

Code4= Output failure O2/sensor heater

Here's the procedure to perform, this one is a little bit more tricky if you do not have the famous test box. I manage to insert wire with prong under the connector (N16)to perform the test. You need to leave the MAS (N16) connected, because the engine have to run idle for this test.

The scope of this test is to check:

1- For open circuit
2- Voltage supply at the O2-sensor heater
3- Control signal at the O2-sensor heater


1- For open circuit

Engine off

Unplug the connector from CIS-E (N3) module and unplug the connector from the MAS (N16).

With a ohmeter hook between pin3 from the the CIS-E (N3) and pin18 from the MAS (N16) you sould have less than 1 ohm.

Out of range = Open circuit

2- Voltage supply at the O2-sensor heater
From the connector (N16) hook a voltmeter between pin4 and pin20
Engine at idle, you should have 11-14V

Out of range = CIS-E control unit(N3) or MAS control unit (N16)

3- Control signal at the O2-sensor heater
From the connector (N16) hook a voltmeter between pin4 and pin18
Engine at idle, you should have 11-14V

Out of range = CIS-E control unit(N3)


I perform the test on my 190e, I have no open circuit, my voltage between pin4 and 20 was 13.48 volts, the voltage between pin 4 and 18 was 11.70 volts.

Should I have the same voltage for the 2 test or is this normal???

I do not know why I got this code and the test procedure say everything is in the spec.

Anyone have an idea??

Don't forget erase the code with your code reader after you perform the test.

This morning it was -19C°, the Mb do not stall at the convience store as usualy but when I put it on the park engine at 80C° the idle was boncing from 450 to 1500rpm.

Max