Well, those bytes do look to be an 8-bit checksum, as they're a one's complement of each other.

Joe.

Looks like the ALDL is different on the US cars. We grounded the diagnostic terminal and counted flashes for years until scan tools were available. If needed we could change the diagnostic connector or make jumpers and use a scan tool for a VR. Thanks for the info! Although you could be right, I'm ...

Since the OP is in the 'States, the ECM is probably a '165 rather than an '808. This means that the ECM includes the ALDL interface circuit, which is wired to pin A8. If the wiring harness brings this line to a suitable ALDL connector, perhaps 12 pin or "OBD 1.5" (16 pin), then there shoul...

Your questions 2&3 are determined by :
- Whether the associated pin circuitry is designed for signal conditioning (ie. input) or driving (ie. output).
- The firmware, particularly what purposes it uses these inputs and outputs for.

Joe.

This is mine: https://pcmhacking.net/forums/viewtopic.php?t=4308&p=59589#p59589 The link is no longer valid but I created a PDF of it back in the day. KnockEars.pdf Works a treat. Easy & cheap to make. Hope that helps. Chuff Thanks, Chuff. To assist in reading the article in full (since the...

If it helps, on a V6 VX, the transmission speed pick-up sensor goes to D1 and D2 on the PCM.

Joe.

Hello Guys, Im running a custom drop tank with a VT Fuel pump assembley complete with fuel level sender. The problem I have is VN is 283ohm Empty and 40 Full where the VT is 243 Full and 40 Empty. I have flipped the float around so now its 243 Empty and 40 full but im wondering is there any tricks ...

The higher the capacity the eprom the longer it takes to clear under UV as the cells have a physically smaller surface area for exposure. No, I don't think so. The cells are smaller but they hold less charge. Only programming takes longer, because unlike erasure, it's done one byte at a time. Joe. ...

Owner had a spare vs v8 chip So i was laughing My uv eraser took around 8 to 10 10 min goes just to wipe the chip tho :( But got there in the end Good idea about cutting the old eeprom off lot easier way of soldering socket on I'd be wary of the reliability of the EPROM data if it's only marginally...

j_ds_au my usb adaptor/splitter is a 1 into 4 splitter So pretty much plug a usb power supply into cigarete lighter then a usb lead from that into one of my 4 ports on my adaptor and it should boost the supply voltage to the devices ? To see if it is a power supply issue Doesn't sound quite right. ...