Steptoe's photos Posted October 10, 2023 Share Posted October 10, 2023 I am hoping to find if any US models got the DENSO ECU as found on AUDM EJ202 Forester SF 1997-2002 , or maybe another way of asking is did the US get the EJ202 as I suspect the last character identifies the DENSO block mounted ECU thanks Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted October 11, 2023 Share Posted October 11, 2023 None. All USDM models have the ECU under the dash or under the passenger floor. We did not get the EJ20 except the EJ205 turbo. EJ18, EJ22 and EJ25 only for USDM. GD Quote Link to comment Share on other sites More sharing options...
Steptoe's photos Posted October 11, 2023 Author Share Posted October 11, 2023 GD to the rescue again. OK thanks, that is a disappointment , given the DENSO ECU likes it's own sensors in many respects. hoping to find a new affordable knock sensor - not that I have even priced new genuine if even available. I went with a little of your advice to go EJ , in a tiny way.... Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted October 11, 2023 Share Posted October 11, 2023 (edited) Knock sensors are simple devices and the ECU is only looking for a resistance value generally. Unless you plan on running poor quality fuel I would just stick a resistor in the circuit and send it. One thing you learn from years of tuning and owning a dyno - knock sensors are one of those "last 1%" items. Generally the engineering and preparation that goes into their use makes them worthless and inconvenient for motorsports, engine swaps, etc. They don't like noisy environments like custom exhaust headers, custom engine mounting situations.... they like very quiet grandma friendly environments. They will usually tell the ECU to pull a bunch of timing from erroneous "knock" detection in the types of environments we stick them in with regards to engine swaps, high performance modifications, etc. You won't find them on race cars. They are not applicable to that environment. Thus why I suggest to just bypass it and forget about it. Alternatively you could find/measure/guess the frequency response of the stock knock sensor (it's typically chosen based on cylinder diameter), and source something in the same frequency range and change the connector, etc. Knock sensors are just piezo-electric microphones that are tuned to hear a specific resonance frequency of the cylinder bore size. Figure out the frequency and find one similar from any other model. Problem solved. GD Edited October 11, 2023 by GeneralDisorder 3 Quote Link to comment Share on other sites More sharing options...
el_freddo Posted October 12, 2023 Share Posted October 12, 2023 Jonno, for a moment there I thought you might be fishing for a compatible ECU that didn’t have an immobiliser unit tied into it. I’ve not come across this issue with specific sensors for a type of ECU, but then again I’ve always replaced like for like as required. Cheers Bennie Quote Link to comment Share on other sites More sharing options...
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