[Diy_efi] Jetronic - RFI

Don Sauman donsauman
Thu Mar 2 05:33:47 UTC 2006

Thanks. I will check that.

Tom Visel wrote:

> 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.
> TomV
> 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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Don Sauman
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Carlisle 6101
Western Australia

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