93 nissan 240 ls1 swap mode 1 error

[doc350]

i had a customer bring a 93 nissan 240 with a 2000 ls1/t56 out of a camaro by today for some tuning. i was able to extract the existing stock file out of the ecu, but when i tried to flash i got a "mode 1 error" while it was downloading the bootloader (i think thats what it says).

i did a quick search and it seems most of the time this is a battery voltage issue. but the same problem existed with a battery charger hooked up.

we also tried a different ecu that the customer had also with no luck.

does anyone know what could be causing this? i told him to go and check power and ground at the ecu and let me know if he finds anything.

is there a description of what the various errors mean? i have seen mode 2 and mode 3 as well.

thanks in advance for any help.

[planethax]

..... i told him to go and check power and ground at the ecu and let me know if he finds anything.......

I think you are on the right track there.
Check all Main grounds as well.

[PopUpBlocker]

While obviously paying special attention to that whole cigarette lighter/com port circuit for interference via shorts, bad grounds, accessories wired in, even just spotting higher than called for fuses can help pinpoint gremlins.

[doc350]

thanks for the input guys. im gonna see if he can just have me diagnose the car rather than have him try a few things and come back to see if it worked.

im still thinking electrical.