2zz Swap on Vitz/Yaris SCP90

[blindmanwatching]

Originally Posted by CTScott

Wiring to the OBD plug is typically very trivial. That vintage is ISO9141, so there is one (K line) wire that is the communications wire.

Pin 16 is constant 12 V power
Pin 4 and 5 are grounds
Pin 7 is SIL, which is a direct connection to the ECM
Pin 13 is TC, which is a direct connection to the ECM

An OBDII reader communicates with the ECM via pin 7, which is the "K Line". For a standard OBD reader, just 4,5,7 and 16 are needed. Pin 13 is a toyota specific diagnostic wire.

Thanks for the response.but on the ECM end, where will all these wires be connected? or will only pin 7 be connected to one of the pins on the ECM?