Hi,
I have a saturn lw300 wagon with a 24v 3.0 engine it has me puzzled! My wife started complaining it was losing power then finally it stopped running weeks later it would turn over and sputter and every now and then rev up and shut off. I checked the CPS it ohmed out at 850 and fuel to the rail is 45psi i changed the plugs which were fairly black and managed to get it to idle roughly but when you hit the pedal it barely moves the idle speed 1500 rpm max. I put the code reader on and was shocked to see 40 codes present some saying the ecm is faulty some about a wastegate some about lean in banks 1 and 2 i mean all over the board and not would clear out tried twice. This is leading me to think the ecm is the problem anyone with any input or similar problems?

 

Post the codes if you don't have them get them.

 

I will pull them back up but its a long list!

 

Have you checked for a clogged catalytic converter?

 

It seems to have good pressure coming out of the tailpipes i thought that was a possible problem! here are all the codes in the order they came out = p0502 p0604 p0606 p0716 p0717 p0742 p0751 p0752 p0756 p0757 u2104 u2105 u2107 p1780 p1815 p1816 p1817 p1818 p1847 p1860 p1887 p1795 u2103 u2107 p1516 p1780 p1632 p0503 p0562 p0563 p0601 p0602 p0603 p0727 p0741 p1621 p1791 p1810 p1817 p1842 p1843 p1845 p1516 p1780

 

You may want to try another code reader and see if you come up with something different. See what O'reallyAdvanceNapaZone comes up with. Not sure what "u" codes are.

http://www.engine-light-help.com/sat...ine-light.html

http://engine-codes.com/make/saturn

 

The one i have is a actron unit which works well however it does not show a lw300 just 4cyl versions i had to jump to a L series but still show vin code R 3.0 that may be some of the issue or the ecm is whacky showing everything but something is really wrong when it puts up 40+ codes!

 

My Service Data for a 2002 LW300 wagon indicates that it needs a Tech2 scan tool to deal with the on board diagnostics.
The code list starts with P0030 and goes up to P1887 with U codes identified as;
UXXXX as communication malfunctions, see body control module sections.
The written data contains volumes of information an would make a large novel if it was fiction.
It would take me hours to go through this list with an explanation for each one but apparently I have the data to do so.
I am not going to take the time to do so for grins. But if there is a need for it because it can not be found by purchasing a manual, let me know and I will.

 

I lied, for grins I did look up this much.

it is a good recommendation for;
1. buying a scan tool

and

2. Buying a service document



so here goes.



p0502 – OSS Circuit Low input
p0503 – OSS Circuit intermittent.

p0562 – System Voltage low
p0563 – System Voltage high

p0601 – ECM Memory
p0602 – ECM Not programed
p0603 – ECM Memory RAM
p0604 – TCM Memory RAM
p0606 – ECM Internal performance

p0716 – Input Speed Sensor intermittent
p0717 – Input Speed Sensor Low Input
p0727 – Engine Speed Circuit No Signal
p0741 –TCC System Stuck Off
p0742 – TCC System Stuck On
p0751 - 1-2 Shift Solenoid Stuck off
p0752 – 1-2 Shift Solenoid stuck on
p0756 - 2-3 Shift Solenoid Stuck off
p0757 – 2-3 Shift Solenoid Stuck on.

p1516 – Command vs Actual throttle position error

p1621 – TCM Memory Performance
p1632 – Theft Deterrent system fuel disabled

p1780 – Torque Reduction Signal
p1791 – Throttle/Pedal position Signal
p1795 – Throttle Body Position Signal

p1810 – TFP Valve Position Switch Circuit.
p1815 – TFP Valve Position Switch Start in Wrong Range
p1816 –TFP Valve Position Switch Start/ neutral with drive ratio
p1817 –TFP Valve position Switch Reverse with drive ratio
p1818 – TFP Valve Position Switch –W/O Drive ratio
p1842 -1/2 shift solenoid circuit with low voltage
p1843 – 1/2 Shift Solenoid circuit with High Voltage
p1845 – 2/3 Shift Solenoid circit with Low Voltage
p1847 – 2/3 Shift Solenoid circuit with High Voltage
p1860 - TCC PWM Solenoid Circit
p1887 – There was none, either you or I copied it wrong

u2103
u2104
u2105
u2107



My best guess at the moment?

Have a volt meter ready to read the battery voltage and some one to read it while some one else tries to start the car.

I am gonna guess the alternator might have gone out and the regulator failed thus giving some seriously Wacko voltage readings and if while the engine is running you get wacko readings I think considering changing he alternator might be a good idea.

But? then again it might not.
Normal with the engine running you would expect to get a stable 14.6 or so volts read at the battery.

I'm going to bed.

 

I was looking yesterday a bit for another scan tool most common is the actron which i have and it did give me the break down of everycode that was listed. I will look into the Tech2 and see if i can find one also check running voltage at the battery. i know all these caodes are either set for a main reason or the scanner is being funny because it does not read that model correctly.
Thanks for the input!