One Jimny owner offered to swap my 34960-81A00 vehicle speed sensor (VSS) for his 34960-81A20. Since I have several 34960-81A00 sensors, I of course agreed.
On the left is the 34960-81A00 (for 4.09 + 205/70R15 or 4.3 + 175/80R16), on the right is the 34960-81A20 (for 5.375 + 175/80R16).
Using the diagnostic software (speed value for ECM) and GPS, I made a comparison.
Stock: final drive ratio 4.09 + 205/70R15 (about 26") tires, now: 5.375 + 30".
With the 34960-81A00 (stock) VSS:
("Скорость" means "Speed" in km/h, I forgot to change the language)
VSS shows 60 km/h at 51 km/h. Quite an overestimate.
With the 34960-81A20 VSS:
("Скорость" means "Speed" in km/h, I forgot to change the language)
VSS shows 48 km/h at 50 km/h.
This way the readings are closer to the real speed. The only bad thing is that the indicated speed is lower than the real one. But this is on the diagnostic, whereas the speedometer readings are the same as the real speed.
Of course, with bigger wheels (32"/34") the indicated speed will be lower, but now I use only 30" for long distances.
So I left the 34960-81A20 installed on my Jimny. And I need to correct the speed coefficient for the RIF-500 trip computer.
By the way, the automatic transmission control module of my Jimny doesn't use VSS at all. Instead, it receives a fake signal from an NE555 pulse generator to enable 4th gear and lock up the torque converter even when the low range of the transfer case is engaged.
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