Toyota 89661 Ecu Pinout [better] Jun 2026

When cranking, the FC pin should switch to ground, activating the fuel pump relay. If it remains open, the ECU is not seeing a clean engine speed signal from the NE (Crankshaft) sensor.

The Ultimate Guide to Toyota 89661 ECU Pinouts: Identification, Wiring, and Troubleshooting toyota 89661 ecu pinout

Engine speed (RPM) crankshaft position sensor signals. When cranking, the FC pin should switch to

Oxygen Sensor signal and Oxygen Sensor Heater control. Communication & Body Controls toyota 89661 ecu pinout

Toyota and Denso evolved their ECU connector types over the years. Pinouts are generally categorized by the number of yellow or grey plastic plugs and the total count of pins. Yellow Plug Era (Late 1980s – Mid 1990s)