T42 Bench Flash Tool - 120 ohm Termination

[dave w]

I'm wanting to build a stand alone T42 Bench Flash Tool, without using an E38 computer for the 120 ohm CAN termination.

I'm needing help findig a T42 Bench Flash Tool schematic that shows the 120 ohm Termination resistor.

That attached .pdf shows a T42 / E38 Bench flash tool. The Tool I would like to build will not have the E38, so I'd like to use 120 ohm resistors instead.

Thanks in advance,
dave w

[NISANDA]

i can read t42 with out the e38 ECM they just dont show any vin number or vehicle info etc, but the file its readeble and writteable.

[dave w]

i can read t42 with out the e38 ECM they just dont show any vin number or vehicle info etc, but the file its readeble and writteable.

That good to know.

Would you be willing to share the wiring diagram of your T42 bench tool?

dave w

[NISANDA]

That good to know.

Would you be willing to share the wiring diagram of your T42 bench tool?

dave w

Yes, the pins are:
Pin 31 - Ign Voltage (Switch)
Pin 32 - Battery Voltage (Constant)
Pin 49 - Ground (Big Black-white wire)
Pin 37 - CAN -
Pin 38 - CAN +

Works very good read all v8,v6 and 4 cil ecotec transmisions no problem.
And it does read with Vin and vehicle info with tunercats.

[dave w]

Thanks for the information

I ended up wiring like the EFI Live Tutorial, including to the ECM. See Pic below.

dave w

T42 Bench Flash.JPG

[In-Tech]

Semi subject and a bit off topic. Do any of you know where to buy connectors and terminals for e38, e67 and t42 at a reasonable price? I haven't set up bench programmers for any of the above and would like to. Thanks,
-Carl

[NISANDA]

Thanks for the information

I ended up wiring like the EFI Live Tutorial, including to the ECM. See Pic below.

dave w

T42 Bench Flash.JPG

Yes pretty much the same 