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DonDittmar 
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Joined: 15 Sep 2009
Location: MIllersburg, MI
Points: 2476
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 Topic: Any Chrysler techs out there?
Posted: 02 Aug 2020 at 9:35am |
My dad has a 2002 Caravan Sport with the 3.3L. Starts and idles ok, tach works, but when you get it out on the road and get after it a bit, it will downshift, RPMs will got to about 3000, but you don’t get any speed. Acts like the timing is off to me. When you plug into it with the scan tool there are no codes. Data stream shows cam sensor signal “lost”, crank sensor signal “lost”, and cam and crank sensor “out of sync”, yet it will start and run.
If you had 5 miles of straight flat ground you might be able to get it 40mph, yet it will idle all day just fine
Cam and crank sensor have both been replaced
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Experience is a fancy name for past mistakes. "Great moments are born from great opportunity"
1968 D15D,1962 D19D
Also 1965 Cub Loboy and 1958 JD 720 Diesel Pony Start
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DMiller
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Joined: 14 Sep 2009
Location: Hermann, Mo
Points: 29555
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Posted: 02 Aug 2020 at 9:39am |
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I would start with checking Cam drive, as that runs everything, that slips or gets too slack all manner of ignorance starts, could also be seeing bad sensors as to Crank and Cam, when were those last changed?
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DonDittmar
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Joined: 15 Sep 2009
Location: MIllersburg, MI
Points: 2476
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Posted: 02 Aug 2020 at 9:49am |
just changed both sensors and it didn’t make any difference
I too was thinking a mechanical issue but I wanted to get some other opinions before I dive into the front of this thing
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Experience is a fancy name for past mistakes. "Great moments are born from great opportunity"
1968 D15D,1962 D19D
Also 1965 Cub Loboy and 1958 JD 720 Diesel Pony Start
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DMiller
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Joined: 14 Sep 2009
Location: Hermann, Mo
Points: 29555
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Posted: 02 Aug 2020 at 10:04am |
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Just a thought, with both sensors showing out on diagnosis, and knowing MI is worse than MO for salt applications, may want to start following the harness back to firewall plug, chances are salt cancer has gotten to the connections.
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Grayray
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Joined: 12 Sep 2009
Location: Ambridge PA
Points: 3801
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Posted: 02 Aug 2020 at 10:40am |
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My thoughts as well. Yes, sensors can cause a lot of other problems, but when several sensors go at once, it leads me to believe there is a wiring problem or a main computer problem. If a wiring problem also look at the grounds. A bad ground can cause a lot of problems as well as loosing your sanity.
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AC7060IL
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Joined: 19 Aug 2012
Location: central IL
Points: 3207
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Posted: 02 Aug 2020 at 10:50am |
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Transmission shift solenoids are compromising- failing. When solenoid(s) don’t shift properly, it trips transmission control unit into default mode(3rd gear usually?).
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DonDittmar
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Location: MIllersburg, MI
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Posted: 02 Aug 2020 at 11:21am |
I was leaning towards either mechanical failure of some sorts or a pcm failure
If the scan tool shows no cam OR crank sensor (both show signal loss according to the scan tool) how is the engine even starting and idling?
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Experience is a fancy name for past mistakes. "Great moments are born from great opportunity"
1968 D15D,1962 D19D
Also 1965 Cub Loboy and 1958 JD 720 Diesel Pony Start
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AC7060IL
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Joined: 19 Aug 2012
Location: central IL
Points: 3207
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Posted: 02 Aug 2020 at 1:25pm |
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Try disconnecting the battery ground for 30 seconds - 1 minute. Then reconnect the battery ground & test drive it. The battery disconnect will reinitialize it’s control module(s), clearing any previous shift defaults. During the test drive, If it behaves & shift solenoids happen to shift properly, then it will act (drive) normal as long the vehicle stays in its highest gear, not requiring any shift solenoid action to a lower gear. If still on your test drive, the vehicle requires a stop & lower shifts are required then it could possibly default again. Hence if any of its shift solenoids fail, then it’s control module will permanently place vehicle into default again - probably 3rd gear limp mode. So then another battery disconnect will then be required to bring it out of default.
If this scenario repeatly happens, then it indicates that your shift solenoids need attention - ie...transmission rebuild.
Edited by AC7060IL - 02 Aug 2020 at 4:27pm
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SLee(IA)
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Joined: 11 Sep 2009
Location: Polk City, Iowa
Points: 252
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Posted: 02 Aug 2020 at 11:28pm |
Don, your description of the cars problem sounds similar to a problem we had with a 2002 malibu. Finally figured out the catalytic converter was plugged up. Lack of power from the engine was preventing the transmission from shifting properly. New converter and no more problem. Steve
Edited by SLee(IA) - 02 Aug 2020 at 11:39pm
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shameless dude
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Location: east NE
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Posted: 03 Aug 2020 at 4:43am |
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also sounds like a tranny problem to me.
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HD6GTOM
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Joined: 30 Nov 2009
Location: MADISON CO IA
Points: 6627
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Posted: 08 Aug 2020 at 9:02pm |
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Don. If you determine it is the tranny, get 1 from an 05 or 06. We had to do that on our 02. It is a better tranny and according to the tranny guys that put it in for me, they bolt right up. Check out the catalytic converter first. I have had to replace 2 or 3 of them over the years. On ford products. They would not get going but idled fine.
Edited by HD6GTOM - 08 Aug 2020 at 9:03pm
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