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No spark after installing new transmission
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landojmar
New User
Nov 2, 2010, 8:32 PM
Post #1 of 9
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No spark after installing new transmission
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Electrical problem
1998 Dodge Dakota 6 cyl Two Wheel Drive Automatic 130k miles
I recently installed a new automatic transmission in my 1998 dodge dakota.
The install took awhile, but other than that seemed to have gone well. When I tried to start it up, it wouldn't go. It only took me a minute to figure out that there was no spark.
I have checked and re-checked all visible wiring for proper connection and/or damage. All, as far as I can see, is well. I followed the trouble shouting procedure in the repair manual for no start in the electrical section:
-check for spark at plug
-check for spark at ignition coil wire
-check for voltage to ignition coil
This is where I think the problem may be. There is voltage at the ignition coil when the key is turned part way, but only for a second, then it drops to zero. Also, when the engine is being turned over, there is no voltage. The next step is to check the Automatic Shutdown Relay, I swapped it for another one and that didn't make a difference either.
The last two checks are:
-signal from the PCM
-and crank and camshaft positon sensors
Is it possible I have just missed a wire somewhere?
Or is it more likely that I have damaged a sensor during the install (but would that result in no voltage to the ignition coil?)
I should also mention that the supposed cause of the transmission failure was a shorted out O2 sensor.
I replaced both the O2 sensors at the same time as the transmission swap. If the short was in the O2 sensor wiring itself, and not the sensor, could this potentially cause the problem I am having?
Any ideas?
Thanks a bunch,
Landon
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Hammer Time
Ultimate Carjunky
/ Moderator
Nov 3, 2010, 2:43 AM
Post #2 of 9
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Re: No spark after installing new transmission
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What you want to do is inspect the Crank sensor for damage or changes in the flywheel or something like that.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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landojmar
New User
Nov 3, 2010, 7:04 AM
Post #3 of 9
(2722 views)
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Re: No spark after installing new transmission
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Thanks, I will check the crank sensor. But what do you mean by changes in the fly wheel?
Thanks,
Landon
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Hammer Time
Ultimate Carjunky
/ Moderator
Nov 3, 2010, 7:07 AM
Post #4 of 9
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Re: No spark after installing new transmission
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When you changed the transmission, was the ring gear with the teeth changed also? If so, it may be different. That's what the crank sensor reads from.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Sidom
Veteran
/ Moderator
Nov 5, 2010, 7:52 PM
Post #7 of 9
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Re: No spark after installing new transmission
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I believe that's via the fuel pump relay..... I'd have to double check but I don't think the ASD powers down after 2 seconds due to it powering so many things.....
But since the tranny was R&R'd....I really look at the ckp 1st, epsecially if it wasn't removed prior to pulling the tranny
(This post was edited by Sidom on Nov 5, 2010, 7:54 PM)
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Hammer Time
Ultimate Carjunky
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Nov 5, 2010, 7:57 PM
Post #8 of 9
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Re: No spark after installing new transmission
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Yes, I believe the ASD is the engine for everything, powers the fuel pump relay and works on 2 second prime and then tach signal. That's why there are so many misdiagnosed PCMs that were actually crank sensor problems. No crank sensor, no ASD during crank. I think that's the way it works.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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landojmar
New User
Nov 18, 2010, 8:53 PM
Post #9 of 9
(2658 views)
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Re: No spark after installing new transmission
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Hi guys,
I just talked to a near by shop, the mechanic there seems to think its the crank sensor as well. I will be taking it in to be looked at in a few days since I dont have any more time to work on it. I will let you know what he figures out. Thanks for the replies.
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