The following two circuits are the simplest version of a TRE you can build. One is for the '97 TLS with a two wire plug, switched and unswitched. The other diagrams are for all FI Suzuki's '98+
*** Make that the following three circuits. The 3rd one will do all of the TL's including the 97 TLS with the two wire GPS (and the rest of the FI Suzuki's, although it will still confuse the gear position indicator on the models with a gear position indicator). ***
Do it yourself TRE
Do a search on TLZone for TRE and you'll find a lot of info on it.
Click here.
In the version below - found on the SV-Portal (I'm not sure if this was the 1st realisation of this extremely simple version or not, but it's the 1st place I saw it thanks to D'Ecosse pointing it out). The TRE acts exactly like an 'Active' one. That is - neutral remains untouched and all the other gears appear as 5th or 6th to the ECU. This only works as long as the gear position sensor is good. Several TL units have been known to go bad.
It doesn't get much simpler than this. Cut the red or pink wire, anywhere you like and fit a 6K8 / 6.8K / 6800 ohm resistor inline with it. Wattage is unimportant.
I have more comprehensive diagrams on the gear position set-up here! But basically it works like this:
1st = 560 + 6K8 = 7.36K is > 5th gear 2nd = 830 + 6K8 = 7.63K is > 5th gear 3rd = 1K5 + 6K8 = 8.30K is > 5th gear < 6th gear 4th = 2K7 + 6K8 = 9.50K is > 5th gear < 6th gear 5th = 6K8 + 6K8 = 13.6K is Way closer to 6th than 5th 6th = 15K + 6K8 = 21.8K is > 6th < neutral and confirmed with test
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