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Old 10-25-2016, 02:03 PM   #1
Adomka
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Default Electrical issue or something else?

2004 saturn ion quadcoupe with asin transmission.
124000 miles

Last drive on expressway car went into limp mode and unable to drive until letting it set for 5-10min. I went from 0 error codes to 7.

P1781
P0791
P0700
P0641
P0452
P0122
P0117

Causes weird shifting in transmission, car shaking, high and random rpm, random temperature gauge readings, and sometimes complete stalls.

Im guessing electrical wiring issue or maybe bad ecm/tcm. Its the original ecm but replaced tcm due to swap. But doesnt seem like this usually causes problems.

I use to get some weird rpms and battery issues in the rain but now its even when its not raining and no battery light. I am missing the driverside splash guard thought this might be cause for rain issues.


Is going to junk yard and getting replacement ecu tcm and both engine and trans wiring harness a dumb idea?

...
1997 Saturn sl 2
167,000 miles
as of 5/2014

Last edited by Adomka; 10-25-2016 at 02:16 PM..

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Old 10-25-2016, 06:16 PM   #2
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2003 L-Series 3.0L Sedan
Default Re: Electrical issue or something else?

1-Limp mode is misleading. Reduced power mode or limp home mode is associated with drive by wire systems using an electric servo motor to control throttle plate movement and an electronic pedal, both inputting signals to the ecm/pcm that controls throttle. Your Ion doesn't have an electric throttle or electronic pedal. You're probably describing a severe engine power problem that isn't throttle, pedal or ecm/pcm related.

2-Try googling each error code and use [www.obd-codes.com] as a good site for definitions. Post definitions if you want help interpreting them and if there are any common points among them. Sometimes error codes are a result of one problem that creates a cascade effect. Solving the lead error code can solve all of them at once.

Without some more car history (maintenance done, parts replaced, modifications), there's a list of possibilities to consider; fuel filter, fuel pump/pressure, damaged catalytic converter, dying battery, loose belt drive system, failing alternator, etc.. This problem can be either mechanical failure (clogged fuel filter, worn out fuel pump with lower than normal pressures, a clogged catcon that's rattling loose cat guts and blocking exhaust flow to create the engine version of a constipated exhaust, loose belt drive from a worn out tensioner) or an electrical problem with a dying alternator not recharging the battery, resulting in lower than normal electrical voltages that can create unusual electrical/electronic problems with the EFI system along with oddball indicators.

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Old 10-25-2016, 11:43 PM   #3
Adomka
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Default Re: Electrical issue or something else?

Wasnt suspecting any battery or alternator due to headlighs, radio, dash still working. I have code definitions just didnt think about listing them. Not much work at all done besides transmission swap from cvt to 5 speed.

I have no problem starting car exept after when it "acts up" it will start but with high rpms and no shiftibg. But goes back to normal after ten minute wait. More likely to act up on longer drives.

Checked belt it seems fine, not loose or anything.

Oil just changed and trans fluid was fine.

Codes go from tcm emmision fault, torque signal failt (ecm tcm communication problem), ECTS, volt reference 1 (ecm short low/high volt), fuel tank pressure sensor, throttle position sensor, and intermediate shaft speed.

...
1997 Saturn sl 2
167,000 miles
as of 5/2014

Last edited by Adomka; 10-25-2016 at 11:53 PM..

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Old 10-26-2016, 02:34 AM   #4
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2003 L-Series 3.0L Sedan
Default Re: Electrical issue or something else?

When the cvt to manual xmission was made, was this a complete success without any issues or are these problems the result of the xmission swap? Changing xmissions is considered a major modification, sometimes with unanticipated issues.

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Old 10-26-2016, 08:55 AM   #5
Adomka
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Default Re: Electrical issue or something else?

Quote:
Originally Posted by fdryer View Post
When the cvt to manual xmission was made, was this a complete success without any issues or are these problems the result of the xmission swap? Changing xmissions is considered a major modification, sometimes with unanticipated issues.
Nothing really unsuccessfully
Been almost a year now. It shifts a little hard every now and then but thas about it. But reading other people who did the same thing, it seems common.

...
1997 Saturn sl 2
167,000 miles
as of 5/2014

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Old 10-26-2016, 01:10 PM   #6
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2003 L-Series 3.0L Sedan
Default Re: Electrical issue or something else?

Guessing about a solution is always a hit or miss way of doing things. Basic troubleshooting requires checking the basics and not going by what you see, hear or feel. Voltage measurements with engine off/on, compression, removing front precat O2 sensor for catcon check, and checking battery and ground connections are some things to do for baseline information.

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