JAVYPRO
Body Damage is Cool
Reged: 02/04/01
Posts: 1832
Loc: Buford, GA USA
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Gang,
I have been searching for an ECU for my wife's uncle 90 LWB ECU. The original ECU blew/ burned some resistors with a good display of smoke. Oddly enough, the truck will crank and run with the smoky ECU.
Well, after some searching my wife uncle got another ECU. He installed it and guess what? it also went up in smoke burning the same resistors. 
I have not seen the ECU to guess what might be causeing the problem and my best guess is an issue with some shorting wires.
But have any of you ever experience the same?
Javy
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88 red Montero with the Dakar Special Edition decals, 438,000 miles (As of 7/23/2012) some occational blue puffing but still strong and counting!!! I am going ppsshhh (turbo), Stay tuned =) ...
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DougH
Mitsubishi Forum Moderator
Reged: 02/25/01
Posts: 9781
Loc: Putnam, CT
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I thought we talked on here about whether a shorted out idle control motor could cause the ECU to short, but that might have been a discussion related to one of my other vehicles.
My guess is that it is a short somewhere in the system, either a sensor itself or a sensor wire path maybe?
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DougH
1995 Sr. High speed dirt!
www.terminalstills.com
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off-roader
Mitsubishi Forum Moderator
Reged: 01/16/00
Posts: 15504
Loc: Bay Area, CA
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One of the places that repairs ecu's mentions that a damaged IAC/ISC can ground out the ECU causing it to also become damaged.
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Off Roader
96SR (3.15:1 xcase, 35's), 89 V6 SWB (33's)
96SR Build Up Thread
Old web page
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JAVYPRO
Body Damage is Cool
Reged: 02/04/01
Posts: 1832
Loc: Buford, GA USA
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Quote:
One of the places that repairs ecu's mentions that a damaged IAC/ISC can ground out the ECU causing it to also become damaged.
That might explain why it will still run. We got plans to tear this thing up today, that is why I cannot be with y'all at the N GA run.
Lets see what we find.
Thanks
Javy
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88 red Montero with the Dakar Special Edition decals, 438,000 miles (As of 7/23/2012) some occational blue puffing but still strong and counting!!! I am going ppsshhh (turbo), Stay tuned =) ...
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JAVYPRO
Body Damage is Cool
Reged: 02/04/01
Posts: 1832
Loc: Buford, GA USA
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Well here we are beating it. We checked the ISC as per the FSM and it is within specs.
Between connectors 1&4 it calls for 3.5-6.5 Kohms and we are reading 5.3.
Between connectors 1&3 the resistance should change smoothly and it does.
Connectors 1&2 with a depressed pedal it should read:non-conductive and with released: conductive.
So, the ISC is within specs. Next step? Wiring and it is doesn't look fun at all.
Javy
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88 red Montero with the Dakar Special Edition decals, 438,000 miles (As of 7/23/2012) some occational blue puffing but still strong and counting!!! I am going ppsshhh (turbo), Stay tuned =) ...
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MarkG
Body Damage is Cool
Reged: 02/01/01
Posts: 2228
Loc: Scaly Mountain, NC, USA
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Where do the wires go? I would expect they would go to the ECU. I don't have a wiring diagram in front of me. Can you disconnect the ECU plug and run the same checks? This might help isolate a bad wire of connector between the ISC and ECU. Just my $0.02.
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83 4D55 Turbo Diesel 4wd Pickup - Rebuilding
89 6G72 Raider 2dr, ARB Bullbar, Warn Winch, Aisin Hubs, 31x10.5, Cobra CB, Hella Fogs, Bilsteins, PAJERO Badges, Misc AU Parts
95 6G72 Montero 4dr, Aisin Hubs
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conner
Rock Warrior
Reged: 08/30/04
Posts: 642
Loc: N.J.
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Quote:
Where do the wires go? I would expect they would go to the ECU. I don't have a wiring diagram in front of me. Can you disconnect the ECU plug and run the same checks? This might help isolate a bad wire of connector between the ISC and ECU. Just my $0.02.
Yep disconnect the ecu and run the same test from there. be sure the isc is connected.
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Over the hill but still climbing.
88 Montero 2.6L auto, manual hubs, cooling fan conversion gps,recurved distributor,LSD Diff.
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ES_97Sport
Rock Warrior
Reged: 07/19/03
Posts: 551
Loc: Colorado, US
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Javy, don't know if you've seen this. Went though this about four years ago on my Sport. Testing it doesn't mean it's working. Mine tested within spec, too, but it still wasn't working correctly.
DSMIAC Automotive - IAC/ISC Site
Ended up getting my replacement from them. Helpful bunch.
Edward
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'97 Montero Sport LS 5-Speed 3.5L conversion
SAS Dana 44s & ARBs, 35" Yoko Geolandar M/Ts
NP231 B4R doubler/Terra Low231/RP 5.38 228:1
'03 Montero Sport Limited AWD
'97 Montero Sport LS 5-Speed 3-link/SAS project
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