Mega squirt question - Toyota Nation Forum : Toyota Car and Truck Forums

Blazin674 · 05-23-2006, 10:09 AM

the question is when i instal a mega squirt ecu do i still need my factory harness to run my lights and guages? i have a 94 geo prizm and im putting in a bt. sould i get the setup like on the 85 sr-5s where they have that 12v box for it? really would apreciate help thanks

Flashmn · 05-23-2006, 10:11 AM

No, lights and accessories are run from the cars wiring harness. With ms, you'll have a separate engine wiring harness for the MS box.

Blazin674 · 05-23-2006, 10:25 AM

ok thanks

Flashmn · 05-23-2006, 10:39 AM

No probs, I'm working on a MS project for my corolla.

Blazin674 · 05-23-2006, 11:27 AM

what motor are you putting in?

Flashmn · 05-23-2006, 01:01 PM

4A-F converted to fuel injection.

toyotaspeed90 · 05-23-2006, 02:06 PM

just unplug the entire engine harness..... disconnect the 'molex' as well.. but don't cut that up.... you can then start hacking the stock harness up so that it's easy to wire into MS and you don't end up with more than you need for MS

this is a bit brief and was written at 3am... but:
http://northwestmr2.com/viewtopic.php?t=263

Flashmn · 05-23-2006, 03:07 PM

well MS doesnt know too well how to read the stock sensors. I added bosch sensors to my engine, not too hard to do.

Blazin674 · 05-23-2006, 04:50 PM

are the pins on the ae 92 ecu the same as an ae102 ecu

Flashmn · 05-23-2006, 04:52 PM

Dunno, I never had an ECU to start with.

toyotaspeed90 · 05-23-2006, 10:47 PM

Quote:

Originally Posted by Flashmn

well MS doesnt know too well how to read the stock sensors. I added bosch sensors to my engine, not too hard to do.

only problems are the clt and ait sensors.... swap out the resistors for 2.2k ohm ones and you'll be fine

Flashmn · 05-24-2006, 04:40 AM

and the tps, its reverse on the GE and the fE one is the switcheable, so that wont work at all.
My tps is from a volvo V70/S70, and i opted to change the coolant and intake airtemp sensors to bosch sensors as my box has the tables for them. Installation of them was dead easy, I drilled and tapped the coolant temp sensor into the head just under the distributor. Then I put the IAT sensor into the charge pipe just before the tb. Plus as they're standard bosch sensors, finding connectors for them was dead easy.

toyotaspeed90 · 05-24-2006, 12:29 PM

yeah, tps on a 4afe wouldn't work as it's not a potentiometer..... a 4age/4agze one works fine, trust me

if it's reversed then all you need to do is switch 2 wires

Flashmn · 05-24-2006, 01:25 PM

Yeah, but a GE Tps wont fit the TB of a 4A-FE, the GE one is with the toyotas weird claw and the FE one is with the 8mm D axle. Volvo S70 TPS fit just fine with little modification.