Real Time Logging Problems

[v6bucket]

I'm not sure if I've put this in the correct place, but I have a USB comms board & NVRAM mounted in my 808 ecu that I'm having some trouble with. I used the ecu fitted in my UC Torana that has been converted to efi using the $12P setup on Friday tuning the engine in real time without any probs. I've since moved the ecu to another car, still using $12P, I loaded a tune that was a starting point for blown V6 & whilst it was connected the engine started & began logging, then "data error" flashed up intermittently at the bottom of TP5 & the log was lost . I'm now unable to get the laptop to connect to the ecu with the NVRAM in the ecu.
If a memcal only is fitted the laptop connects without issues, fit the memcal to the nvram then fit into the ecu, the laptop doesn't connect.
Memcal only test=When connecting the blue light is lit, the red & green flash on the comms board.
Memcal &NVRAM test +blue light is on. red flash, no green when connecting.
NVRAM only = same as for memcal+nvram.
I have checked the comms board wiring, all appears ok.
At one stage I removed the map switch jumper from the nvram & connected but this wont work now.
Here's a pic of the NVRAM to ensure that the jumpers are correct for a 6 cyl.

P1010789 (712 x 534).jpg (85.33 KiB) Viewed 7085 times

Can someone help steer me in the right direction please.

[Holden202T]

sounds like your nvram is corrupted, i'd suggest putting the nvram chip in the programmer and re-programming both banks with fresh $12p then go from there....

as far as putting the memcal chip in the nvram i don't think that will work as the nvram socket has different pin locations to a normal memcal chip

[krusty]

NVRAm looks o.k. Like the others said maybe corrupt?

[VL400]

An easy test for a corrupt NVRAM is the LED on the NVRAM board. It turns on when the key is turned on but stays lit for approx 2 seconds after the key is switched off. If it goes off as soon as you turn the key off then corrupt NVRAM.

[festy]

At one stage I removed the map switch jumper from the nvram & connected but this wont work now.

I'd remove the W_EN jumper before trying again (and after reprogramming the NVRAM).
Sounds like whatever is causing the corruption is repeatable, as it did the same thing to the copy on the second bank as it did to the first once you switched banks.
Check that the write enable wire on the bottom of the PCB isn't shorting on anything (like the case?) or has broken loose too.

If you think it might be the bin, try putting your known good $12P on one of the banks, and try connecting/logging without the engine running.

[v6bucket]

Thanks fella's, I'll check those things in the morning.
The write enable wire on the bottom of the board is ok.

[v6bucket]

If the nvram requires reprogramming, is the procedure the same as a normal memcal?

[VL400]

Yeah, remove the DS1245 and program it. Just make sure to select DS1245 in the programmer, if its set to an eprom it will be bye bye nvram

[v6bucket]

Turn ignition on led is on, ignition off led out instantly.
It appears that it would be corrupted then.

[VL400]

Yeah sounds like it, make sure you do as festy suggested above as it shouldnt corrupt that easily.