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Hey all,
I think I may have found my electrical issue source and need to remove the shifter instead of dropping the engine hopefully. I don't see anything in the Haynes book on removing it so...

Hey all,
Does anyone have a diagram or photos of the physical locations of the grounds as opposed to just the electrical locations in the schematic?

I've mentioned I have an issue with my ISC...

How do you test the Mass Air Flow Sensor? I've found helpful videos on YT but they're only for 4 wire systems, and it appears the 91 I have is a 5 wire.

Thanks for clarifying. I thought I saw a section for electrical issues but can't seem to find it. Can you please point me towards that? Searching didn't work.

Sorry, are you saying 4WD as in the older toyota vans vs. an AWD Previa?

So my ISC isn't working correctly but I'm guessing since there's no ECU error codes, the volatge reading for the RSO pin is only initially 9V for a second, I'm guessing it must be a bad ground, or...

Correction here as I just retested the signal coming to the ISC connector (apparently I must've previously had the multi-meter leads connected for resistance still/not voltage) and I only get a...

These seem to work. You're awesome! Thanks. I was able to cross reference these with my Haynes manual and I see the ISC inputs where it meets the computer, they just didn't label the box in the...

So I put 12 volts directly to the IAC and it fixed the low idle. Apparently it's not getting a signal from the computer. I have the Haynes manual but it doesn't show the IAC on the starter circuit or...

Thanks for the reply and the detail on what those do. One thing I forgot to mention is that I've had a somewhat similar issue before where it would die at stop signs (manual tranny so it'd be out of...

What is the difference between the IAC (Idle Air Control?) and the ISCV (Idle Speed Control Valve?)? I'm having issues with a really low idle to where it died within about 10 seconds after starting....

The problem with this video is the Previa doesn't have that bypass channel that's in the Camry throttle body.

So I'm having this issue when I start my 1991 Previa. It would die if I didn't give it gas when cold until I set the idle up higher to prevent that. It can go up or down a bit (±200rpm) as I'm...