mk1 computer compatibility

hosh · 03-15-2007, 03:25 PM

I have an 85 5 speed. What years can be used for a doner ECU?

toyotaspeed90 · 03-15-2007, 03:46 PM

85-89 mr2, ae92 gts, ae82 gts, ae86 gts.... just need to make sure the distributor has the same ignition setup (there were 2 versions)

hosh · 03-15-2007, 05:02 PM

Are the differences obviouse or subtle?

toyotaspeed90 · 03-15-2007, 08:27 PM

they are subtle, actually..... write down what the numbers are on your ignitor assembly and the ecu pinouts....

hosh · 03-16-2007, 10:04 AM

I'll have to look tonight. I do have two spare distributers. One has grey connectors and one has green connectors. The one on my car also has green connectors.

TheAmazingDave · 03-16-2007, 09:09 PM

the differences are obvious if you look inside the distributor.

To my knowledge, the largeport 4A-GE has four "pins" on the camshaft position sensor, while the 4A-GZE and smallport 4A-GE use a thirty-six pin (IIRC) camshaft position sensor. The camshaft psoition sensor is a hall-effect magnetic pick-up system built in to the distributor. There is also a second sensor in the dizzy with one pin, to simply count engine revs, in both versions.

edit: I also believe the plugs are different, where the "four pin" version has a circular socket and the "thrity-six pin" version uses a square socket.

03-15-2007, 03:25 PM	#1 (permalink)
hosh to many yotas, never! Join Date: Mar 2007 Location: skiatook, ok Posts: 75 Thanks: 3 Thanked 2 Times in 2 Posts iTrader Rating: (0/0% )	mk1 computer compatibility I have an 85 5 speed. What years can be used for a doner ECU?

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03-15-2007, 03:46 PM	#2 (permalink)
toyotaspeed90 No Skills Join Date: Jun 2006 Location: Bellingham, WA Posts: 422 Thanks: 0 Thanked 32 Times in 32 Posts My Google Map iTrader Rating: (0/0% )	85-89 mr2, ae92 gts, ae82 gts, ae86 gts.... just need to make sure the distributor has the same ignition setup (there were 2 versions)

03-15-2007, 05:02 PM	#3 (permalink)
hosh to many yotas, never! Join Date: Mar 2007 Location: skiatook, ok Posts: 75 Thanks: 3 Thanked 2 Times in 2 Posts iTrader Rating: (0/0% )	Are the differences obviouse or subtle?

03-15-2007, 08:27 PM	#4 (permalink)
toyotaspeed90 No Skills Join Date: Jun 2006 Location: Bellingham, WA Posts: 422 Thanks: 0 Thanked 32 Times in 32 Posts My Google Map iTrader Rating: (0/0% )	they are subtle, actually..... write down what the numbers are on your ignitor assembly and the ecu pinouts....

03-16-2007, 10:04 AM	#5 (permalink)
hosh to many yotas, never! Join Date: Mar 2007 Location: skiatook, ok Posts: 75 Thanks: 3 Thanked 2 Times in 2 Posts iTrader Rating: (0/0% )	I'll have to look tonight. I do have two spare distributers. One has grey connectors and one has green connectors. The one on my car also has green connectors.

03-16-2007, 09:09 PM	#6 (permalink)
TheAmazingDave Cage Fighter Join Date: Mar 2005 Location: San Jose, CA Posts: 1,112 Thanks: 14 Thanked 7 Times in 7 Posts My Google Map iTrader Rating: (0/0% )	the differences are obvious if you look inside the distributor. To my knowledge, the largeport 4A-GE has four "pins" on the camshaft position sensor, while the 4A-GZE and smallport 4A-GE use a thirty-six pin (IIRC) camshaft position sensor. The camshaft psoition sensor is a hall-effect magnetic pick-up system built in to the distributor. There is also a second sensor in the dizzy with one pin, to simply count engine revs, in both versions. edit: I also believe the plugs are different, where the "four pin" version has a circular socket and the "thrity-six pin" version uses a square socket.