Reply To: GT250 EFI DSpec Stalls at Idle after Warm Up
With the IAP-2 disconnected you should get the C18 error. Do you confirm this?
With IAP-2 disconnected and bike power turned on, check the voltages on the 3 wires of its terminal connection.
According to my manual, the resistance to ground(chassis) from the BW wire should be 0 ohms. The voltage on the OB wire should be between 4.5V and 5.5V. There is no value specified on the BY wire with the sensor disconnected. I would expect it to be zero.
Repeat measurements with sensor connected and compare. The value on the BY wire should be as stated previously.
I would also compare these figures with those on the IAP-1 sensor. Note that the equivalent to the BY will be BL.
Hopefully these measurements may lead you to a solution.
With regards to your VCDS cable it appears to be similar to the VAG-KKL cable. The software to go with it, which I had mentioned at the earlier in this thread, was written for the Delphi ECU MT05 so I am not sure if you can use it with your ECU. You need to check this.