QuestionRoland,
I got a used ECU from a salvage yard, the car started right up!
I was wondering what made the old ECU go bad. The spark plugs were beyond worn out (just nubs) & one was broken and probably wasn't working. Also the thermostat is stuck wide open so the engine rarely gets up to operating temperature.
Also this Van is equipted with an electric wheelchair lift and electric seat as the driver is paraplegic.
(I replaced the plugs and will replace the t-stat shortly.)
I really appreciate all your help; the owner was in tears when she found out she could drive again. This is the only car they had with hand controls etc.
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Roland;
I did all things you listed.
There was NO ASD click & No 1 sec. coil power when helper turned key to run.
Jumping ASD produced 12v at coil, but NO spark from coil wire & NO fuel pump noise. & No Start. (But i did jump fuel pump relay also and it DID produce continuous running from fuel pump) But no spark, no start.
The 'check engine' light comes on and goes out as normal when turning key on; But no code 11,54,or 55 when checking for codes. It gives no codes whatsoever.
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Thank you for the quick response!
The Voyager has an automatic and it is the basic model.
The red/white wires & #3 pin you listed all have 12 volt power.
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(I asked this question months ago couldn't follow up because voyager was somewhere else)
93 -3.0 calif emissions computer # 468 6627
There is no spark, no fuel pump running, absolutely no codes whatsoever. not even 'all clear' code
No power to coil; distributor turns when cranking; Grounds are good. ASD seems OK.
This van has already been to a competent mechanic and he couldnt pull codes so he thinks it needs a new ECU; but couldn't guarantee it. So he was going to throw parts at it.
He is not a Chrysler person.
Fuses look ok and dash lights work.
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Hi Ken.
Besides fuses there are fusible links up the chain near the battery. It appears that you aren't getting main power to the engine's fuel and spark systems. I would look to see if you have power on a 14 gauge red/white trace wire that should be 'hot' all the time, at the following locations: fuel pump relay, autoshutdown relay, powertrain control module (pin 3) (ecu). If not then check a white fusible link near the battery which is in a bundle of fusible links. Of course you would want to see what kind of resistance the end of that link is looking at before you just replaced as there may be short that would blow it again. If you find that red/white wire is carrying 12V direct from the battery then we will proceed from there. But it sounds to me like the whole power supply to these vital modules is gone. When you write back let me know if you have the manual or the automatic transmission.
Don't throw parts at the van, it is a sure way to frustration and overwhelming costs.
Roland
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Ok Ken,
Now I would suggest that you have a helper turn the ignition key to the run position while you listen for:
the ASD relay to click on and then off after about 1 second, and for the fuel pump to run for about 1 second ( its in the tank at the rear of the van) and for 12v to appear for 1 second at the + post of the ignition coil plug (pull the plug and test at the cross-bar contact of the "T"-shaped terminals, as compared in comparison to engine ground or the (-) post of the battery). If that doesn't happen then I would pull the autoshutdown relay and jump between the two pins that are opposite to one another (jumping between the red/white and the dark green/orange wires,i.e. from the pin next to the inner fender to the opposite one of the socket) which will mimic the actuation of the ASD and guarantee 12v will be applied to the coil, the fuel pump, and try and start it. If it starts, then the ASD is either no good or it is not getting a signal to activate it from the ecu; if it doesn't start then I would suspect that one or both sensors in the distributor that feed the spark and injector pulses are questionable. But were that latter 'no start' the case, you ought to get an 11 or a 54 code. When you said you got "no codes" did you mean you didn't even get a 55 (which always should appear because it means 'end of readout')? If you truly get no codes at all then either the check engine bulb is burned out or there is something the matter with the ecu or with the connection from the ecu to the check engine bulb at the cluster.
So give those several test a try and let me know what happens.
Roland
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Hi Ken,
Thanks for the detailed and helpful report back. It appears to be a basic voltage missing problem. The only one we haven't checked yet is the "start/run" that comes via the ignition switch (dark blue wire at pin #2). It feeds the ecu (pin #9 of the 60 way) and the activation coils of the ASD and fuel pump relays. You can find it at all those locations when you have key in the run or start positions.
It is also easily accessible at the 6-way data link connector on a pigtail in the engine compartment near the battery where you would plug in a diagnostic readout box. This is a very central voltage, obviously. If you don't get it then check that 12V is getting to the ignition switch from the battery on pin #7 at the switch (red wire). If you have it at #7 but not coming out on #2 when you have the key in run and start then the ignition switch is bad.
Otherwise, if it is indeed showing up at all the other spots I mentioned above then it does point to a faulty ecu. But the last thing to check before going that route is that the ground wires for the ecu are patent. They are on pins 11 and 12 of the 60-way and are shown to return to the (-) clamp at the battery. So verify those ground before looking for a used ecu. If you are going to the wrecking yard make sure you get one off a van that has the automatic trans and a 3.0L engine. I am really curious to know the answer to this one!
Roland
AnswerHi Ken,
The ecu is just a complex solid state device so it can fail just like a computer board does. I really appreciate hearing back from you as this does happen rarely, but we looked at all the possibilities and that seemed to be the way to go.
Best wishes to you and owner.
Roland
