ajbirkennewaccount
Well-Known Member
- Joined
- Mar 21, 2005
- Location
- Raleigh
I have a 79 Jeep J20 that the PO converted from carb to TBI. He did a great job from what I can tell (which isn't much!).
Chevy 1227747 computer and with a 28 pin reprogrammable chip from moates.
I am getting intermittent rough running after warming up and pulled a 51 code
CODE 51
Trouble Code 51 indicates that the ECM sensed a fault in the MEM-CAL. On power-up, the ECM does a checksum of the MEM-CAL to ensure the MEM-CAL integrity is good. If the calculated sum does not match the sum in the MEM-CAL, the ECM will hardcode 51 and enter Back-Up mode, since the ECM cannot know where in the MEM-CAL the fault lies.
Code 51 is set when:
? the actual MEM-CAL checksum does not match the value in the MEM-CAL
Possible causes include:
1. Incorrectly installed MEM-CAL module
2. Defective MEM-CAL module
3. Defective ECM
I don't know Sh*t about TBI. I'm wondering if the 28 pin chip came loose since it had to be soldered in?
What will happen if I just go buy a new 1227747 computer and plug it in?
Thanks in advance. I think it's great that it can be reprogrammed, but I'm not really sure I want to buy all the junk needed to reprogram etc. I just want to drive the darn thing and not have it run like crap.
Thanks in advance!!!
Adam
Chevy 1227747 computer and with a 28 pin reprogrammable chip from moates.
I am getting intermittent rough running after warming up and pulled a 51 code
CODE 51
Trouble Code 51 indicates that the ECM sensed a fault in the MEM-CAL. On power-up, the ECM does a checksum of the MEM-CAL to ensure the MEM-CAL integrity is good. If the calculated sum does not match the sum in the MEM-CAL, the ECM will hardcode 51 and enter Back-Up mode, since the ECM cannot know where in the MEM-CAL the fault lies.
Code 51 is set when:
? the actual MEM-CAL checksum does not match the value in the MEM-CAL
Possible causes include:
1. Incorrectly installed MEM-CAL module
2. Defective MEM-CAL module
3. Defective ECM
I don't know Sh*t about TBI. I'm wondering if the 28 pin chip came loose since it had to be soldered in?
What will happen if I just go buy a new 1227747 computer and plug it in?
Thanks in advance. I think it's great that it can be reprogrammed, but I'm not really sure I want to buy all the junk needed to reprogram etc. I just want to drive the darn thing and not have it run like crap.
Thanks in advance!!!
Adam