I've been tuning my 350 HO crate motor setup with a stock 1228746 ECM with Modified LO5 bin. I've copied my old bin that with which I had no trouble code problems besides Rich and Lean fuel conditions. Ever since swapping over to a 28 pin chip (27SF512 from Moates) and programming different parameters, its been throwing a code 43 ESC Failure and 51 Prom Error. I've used the G2 chip adapter and ZIF adapter without any obvious physical problems of the installation. The car runs just like it should from the factory if not better. The prom is inserted correctly or it wouldnt start and I'm not sure about the ESC failure. Any help with these codes or disabling them with Tunerpro would be greatly appreciated. (Edit) For people using Tunerpro Here's an Excel spreadsheet to correct your fuel table. Maybe the Mod's could post it somewhere more economical. http://abe.midco.net/swaldner/VE%20C...20TunerPro.xls

 

As sure as you are about not having a physical problem, I'm going to disagree with you. If you are getting sporatic code 51's, then I would dismantle your ECM and resolder every joint on the adapter and make 100% sure the pins on your ZIF socket and chip are clean. Been there, done that, just as you describe (with a P4 memcal modified with a ZIF socket).

 

I'm not getting sporatic code 51's just all of a sudden the engine is throwing a code 51 constantly. I've triple checked the soldering joints, the alignment of the pins with the adapter and zif with no problems. All pins and joints are clean and not crossing. Is this normal for a code 51 when you change to a different type of prom? I'm not sure but do the Checksum and PROMID have anything to do with displaying the code? I've changed the PROMID to what the chip said that was in the car but I cant seem to keep the Checksum the same, it always defaults back to 4F1B instead of 4D8D like the original prom.

 

The prom id is irrelavent to the operation of the ECM. Anytime you make a change to the calibration (VE, spark, etc) the checksum will change to a new value.

1) Does your SES light stay on constantly after key-on (does NOT blink off once) ?
2) do you have ALDL link or are you grabbing the codes by jumpering pins A & B on the ALDL connector?
3) where in 27SF512 are you placing your 4kb bin file?

 

Upon turning the key the light comes on constantly for a few seconds then goes away. The SES Light came on after the car had been started and running for 60 sec's or so and stayed on constantly after. I came home after checking BLM tables with a quick run around town, Then parked the car and jumped pins A&B to get the code. I disabled the SES light from displaying those codes but the ALDL connector that I use for tuning only has those two codes showing. Everything else code wise seems normal. The start address in Hex is 00F000 with the end at 00FFFF. Buffer address is 000000 to 000FFF.