HELP, multi. codes being thrown

[TwinyTwin]

About a week and a half ago I pulled a code 51 from my car.

CODE 51

Trouble Code 51 indicates that the ECM sensed a fault in the PROM.

When the PROM was initially created, a checksum number representing the total of all the cell values was also stored. The ECM uses this checksum as one way to determine if the contents of any cell has changed. A Code 51 causes the ECM to enter Back-Up mode which uses the CALPAK for default sensor values.

The conditions for setting this code are:

power has just been applied to the ECM, and
the calculated checksum does not match the stored checksum.
- or -
the engine was just started, and
either of two specific PROM locations do not contain the expected value. (One location should have 1's in the odd numbered bits and the other has 1's in the even numbered bit positions.)

Typical causes for this code include:

1) Incorrectly installed PROM module
2) Defective PROM module
3) Defective ECM

So I ordered a new ECM and CALPAK after checking my original ECM, PROM, CALPAK and the harness going into the ECM. Well, tonight I installed the new ECM and CALPAK and after 2 minutes of warming up the car it threw the SES light again. So I went to check the code again and it was code 51. So, I cleared the code and the car ran fine and no codes being shown. So we took it for a spin down the road about 3 miles of just easy riding (no quick accel or boost being shown). The car still ran great with no signs of the SES light. Well we decided to ease into it about 5 psi and the SES light shows up. So we took it back to the house and pulled multiple code :11, 13,14,22,24,42,45,and again the dreaded 51. Here is the link to what these codes are http://www.gnttype.org/maint/malf.html. Can someone please shed some light on what I need to do cause I don't want to throw out more money to find out that it wont fix the problem. Thanks in adavce.

 

[pacecarta]

try another chip

 

[bmackinnon]

You haven't been using a battery charger on the car recently have you?? I had the same thing happen recently and discovered that I had fried my ECM by starting the car with the batt charger hooked up. If not, I agree w/ the above... try a different chip as a first step.

 

[REDS HOT AIR]

If using direct scan make sue its not pluged on too far

If you have another chip try it but I dought its that

do pull the chip and make sure none of the pins are bent

wierdest one of all ...I have seen a bad m.a.f do that ...made me go bald figuring that one out

 

[texasturbo]

check for lose ground connections at the back of the block... voltage spikes could be the problem as well (alternator goin bad). since you got another ecm and the problem still comes back. you have to assume it is external to the ecm causing the problem or as was mentioned, maybe the chip.... make sure also when you installed the chip none of the pins got bent or rolled up the chip holder. just my 2... good luck.....

 

[TwinyTwin]

When you guys say use another chip, do you mean another aftermarket one or a stock chip. If you mean a stock one, where could I pick one up locally?

 

[V6POWER]

Aftermarket or stock.

 

[pacecarta]

if you have stock injectors or 30s try a stocker or any chip that is burned for stock injectors . just be carefull if you have the boost turned up or go wot , the stocker may knock with 93 pumpgas
if you have changed your injectors to anything bigger than 30s youll need to find one for burned those injectors

 

[TwinyTwin]

Where could I pick up a stock chip thats local. Would pep-boys, advanced, or a napa carry something like this or would I have to go to a buick dealer. Thanks alot for all your help.

 

[REDS HOT AIR]

you still have stock chip in it?

even tho I dont think its in the chip you could benifit from a good aftermarket chip Like one from Eric at www.turbotweak.com

you could try making a thread looking for other buick guys in your area .. that way you could possibly swap out some parts off their good running cars

 

[TwinyTwin]

I forgot to mention, I was having a problem before the ecm code came up. It was having problems staying at idle and would always shut off and we came to find out that it was the crank angle sensor that was causing the problem. Never pulled the code when I was having the problem so I dont konw if it was causing a code 51. But my question is, should there be a certain gap or setting to the crank angle sensor? Also would anyone know where I could get a wiring diagram for my car.

 

[pacecarta]

http://www.vortexbuicks-etc.com/

detailes the setting of the cam and the crank sensor

if you want wiring or anything else get the GM service manual cd from BANDIT http://www.turbobuick.com/forums/showthread.php?s=&threadid=148124