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Thread: 1999 4runner build highschool/college edition
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Old 08-14-2021, 12:51 AM
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Luckily it's a really simple system. You can try bypassing the VSV and running vacuum directly into the 4WD line to see if that light comes on and the vehicle actually engages 4WD. If it doesn't, there is probably a leak in the 4WD line or the ADD is seized (which is pretty rare especially if you have had it in 4WD recently).

If it does, just test if vacuum is getting through the correct VSV (not both at all times). The 4WD one seizes fairly often with vehicles of this age/not being cycled enough throughout its life.
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