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General VW Discussion This is a place for General VW topics (the company, not your vehicle). General topics about a specific vehicle should be posted in the General TDI Dicussion Forum sections for that vehicle platform. A4, A3 & B4, B5, etc.

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Old April 9th, 2019, 15:53   #1
slim74
Newbie
 
Join Date: Aug 2018
Location: TUNISIA
TDI(s): 66kw AHU
Default Modulating piston displacement sensor voltage

Hello,
I have a passat b5 tdi 90 engine code AHU.i did a scan to verify the engine health.
in measuring block 001 i set the IQ to 4.6 using the hammer mod but the Modulating piston displacement sensor voltage is 1.42v.should i set the IQ higher to reach the minimun sensor voltage of 1.450v? the throttle response is already weak!!
other question concerning block 13 for soft idle running, the IQ for cylinder 04 is not shown in field 04!!! any help please?

Last edited by slim74; April 10th, 2019 at 02:07.
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Old April 14th, 2019, 07:41   #2
KLXD
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Join Date: Aug 2009
Location: Lompoc, CA
Default

On the AHU cylinder 4 IQ is not displayed. The other three are relative to cylinder 4. In other words whatever 4 is +/- the displayed value for that cylinder. That's what I've read here anyway. Not sure if I've seen it in any official document.

Can't help you on the QA voltage.

You'll probably get more response if you post this in the A3/B4 Forum. They got the AHU engine over here.
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