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How to Test 1980 KZ1000G Classic Computer ECU 07 Oct 2014 10:25 #649965

  • Z Parts
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Need to know if there is anyway to test the ECU computer off the bike if it is good or not. Any help would be appreciated.

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How to Test 1980 KZ1000G Classic Computer ECU 07 Oct 2014 11:05 #649969

  • loudhvx
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Not simply with a meter.

You can bench test it with a good coil and a battery and some wire. I can give details if needed.
I will eventually draw up a test diagram for bench testing for actual spark.

This link shows how to make one from HEI parts.
home.comcast.net/~loudgpz/GPZweb/Ignition/GPZgmHEImod.html
The following user(s) said Thank You: Z Parts, th00r

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How to Test 1980 KZ1000G Classic Computer ECU 15 Oct 2014 13:52 #650737

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instant bookmark of loudhvx link ! thanks

yet... thats for the igniter... i believe Z Parts is trying to test the computer under the seat. For the G classic i think will be kind of impossible unless you can get the signals from all the EFI sensors.

in the past I have found some jonke owners and G classic owners that said they tested the computer by plugging it to a fullyworking bike but i cant belive that because:

1) never seen together 2 of the few EFI working in the world
2) I would never let any one put anything in my classic (that sounds odd)
3) i would never lend my working ECU
Current:
2013 BMW F800gs
2012 HD Seventy Two 1200cc
1980 KZ1000 G1 1000cc
Sold but still loving:
2009 Vento Avia 125cc
2008 Vento Thunder 300cc
2005 Vento Rebelian 150cc

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How to Test 1980 KZ1000G Classic Computer ECU 15 Oct 2014 20:36 #650776

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do the basics as if it were a car, test it on your bike. it's it a no spark, no fuel, our none of either?

do you have power? proper ground? at the ecu.
If I knew what I was doing all the time life wouldn't be any fun.

'80 KZ650 E 700cc, dyna ignition and coils, frame up restoration, daily driver
'81 KZ1300 A3 full restoration, custom big bore pistons, 1400cc 6 cylinder super bike
"77 KZ650 B1 - Barn Find, work in progeress
"74 Yamaha DT 400 Enduro

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How to Test 1980 KZ1000G Classic Computer ECU 15 Oct 2014 21:50 #650783

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Oops, sorry, didn't realize he meant the computer for EFI. :blush:

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How to Test 1980 KZ1000G Classic Computer ECU 19 Oct 2014 09:07 #651121

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Maybe put noid lights on your injectors to see if they are getting a signal?
KD9JUR

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How to Test 1980 KZ1000G Classic Computer ECU 20 Oct 2014 00:14 #651206

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Yes they can be tested. I sent me ECU to ..Bettabikes.. in Adelade.. Australia. They fixed it and sent it back. When I pluged it in the bike fired up and ran like new...So they can be checked and repaired, its just a case of finding the right person.

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How to Test 1980 KZ1000G Classic Computer ECU 20 Oct 2014 15:33 #651270

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I've looked through the factory service manual plus later updates: it shows multimeter diagnostics and wiring diagrams of all the component parts but makes no mention of testing the ecu. Pre OBD ecu's on old cars can sometimes communicate by blink codes but I don't think this is an option here.

I guess it is a case of working through all the interconnecting component tests and if everything is ok the only solution is a suspect ecu.
1980 Gpz550 D1, 1981 GPz550 D1. 1982 GPz750R1. 1983 z1000R R2. all four aces

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How to Test 1980 KZ1000G Classic Computer ECU 21 Oct 2014 15:18 #651358

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that's how we did it in the automotive world. You would follow the trouble shooting tree diagram and if you made it through all of the component tests without finding a fault the last step was almost always “replace ecu"

I asked the OP if there was spark, or fuel, our neither because that can help determine were to start checking...
If I knew what I was doing all the time life wouldn't be any fun.

'80 KZ650 E 700cc, dyna ignition and coils, frame up restoration, daily driver
'81 KZ1300 A3 full restoration, custom big bore pistons, 1400cc 6 cylinder super bike
"77 KZ650 B1 - Barn Find, work in progeress
"74 Yamaha DT 400 Enduro

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How to Test 1980 KZ1000G Classic Computer ECU 22 Oct 2014 10:20 #651414

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A lot of 'ECU faults' are an external wiring or sensor fault, assuming it is an EFI fault that is. Saying that, so many EFI bikes got changed to CV34 or other carbs over the years, I guess the ECU maybe not a massively sought after part.

Off topic, but some old Jap analouge electronic music gear I have is 1980's vintage and still works perfectly. So I think the quality of build was so much better for electronics in those days, and the old stuff lasts longer than the new.

If I get another kawi 1100 i'd like it wiith original EFI., so ahead of it's time then.
1980 Gpz550 D1, 1981 GPz550 D1. 1982 GPz750R1. 1983 z1000R R2. all four aces

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How to Test 1980 KZ1000G Classic Computer ECU 24 Oct 2014 01:42 #651593

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If you go to the 750turbo site there is/was some info there on repairing the 750 Turbo computer, and I suspect the Classic computer is probably simpler.
KD9JUR

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How to Test 1980 KZ1000G Classic Computer ECU 24 Oct 2014 18:55 #651666

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www.edlinecycle.com has these ECU's and other FI parts now and then.
1982 GPZ1100 B2
General Dynamics/Convair 1983-1993
GLCM BGM-109 Tomahawk, AGM-129A Advanced Cruise Missile (ACM)

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