[Diy_efi] Jetronic - RFI
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
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.
> 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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