Because the pinout varies significantly by the specific suffix, this article provides a . A one-size-fits-all pinout does not exist; using the wrong pinout can damage the ECU or sensors.
The 89661 prefix is most commonly found on ECUs for:
: Constant 12V from the battery (keeps ECU memory alive). E1 / E2 : Main chassis and sensor grounds. E01 / E02 : High-current grounds for injectors and coils. Ignition & Fuel: