[Diy_efi] Jetronic - RFI

Tom Visel five10man
Thu Mar 2 02:06:47 UTC 2006

You might want to pull the codes the next time this happens and see if 
the ABS computer is complaining about a particular wheel speed sensor - 
it's most likely being disturbed by induction in a long sensor wire, and 
you might be able to shield only the affected wire(s) and obtain 
satisfactory results.


Don Sauman wrote:

> Hi Torbj?rn
> On this same topic, I have 1987 Volvo 760 GLE that has a related 
> problem. While waiting at a railway crossing, an electric train 
> passes, and the brake pedal will vibrate and then relax with ABS 
> warning light coming on. The immediate fix is to, at an appropriate 
> place, switch off the ignition and restart.
> I think you have given me a clue as to a solution. Put the ABS 
> controller in a grounded box, and use some ferrite beads on the leads.
> Comment?
> Thankks
> Don
> Torbj?rn Forsman wrote:
>> LE2 and LU2 ECUs are notorious for bad RF immunity. In cars where the 
>> ECU is located in the passenger compartment, it is common that the 
>> engine dies when someone is using a cell phone or portable radio 
>> transmitter in the car. This is not surprising, due to the design of 
>> the ECU. A 2-side PCB with no ground plane and very little decoupling 
>> of incoming signals, and additionally a case with a plastic bottom.
>> On the other hand, due to the analog design, those ECUs do not create 
>> any nasty RF emissions.
>> Best regards
>> Torbj?rn Forsman
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