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Old 01-08-2009, 06:24 PM
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Max47 Max47 is offline
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Join Date: Jan 2007
Posts: 43
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

Last edited by Max47; 01-08-2009 at 06:27 PM. Reason: add-on
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