Toyota 89661 Ecu Pinout ~upd~ May 2026
The Ultimate Guide to the Toyota 89661 ECU Pinout: Wiring, Diagnostics, and Troubleshooting
Using a Digital Multimeter (DMM):
Sensors:
THW (Water Temp), THA (Air Temp), PIM/VC (MAP/Reference Voltage) . Fueling: #10, #20 (Injector pulses) . Modern CAN-Bus Configurations (2005+) toyota 89661 ecu pinout
However, I can provide you with the resources to find the exact pinout you need, along with the most common pinout configurations for popular 89661 ECUs (typically found in Corollas, Camrys, and Matrixes). The Ultimate Guide to the Toyota 89661 ECU
- CAN H / CAN L — differential pair for diagnostics and module comms
- DIAG / K‑line / DLC — older diagnostic single line
- Immobilizer data / transponder interface — serial or dedicated pins
- LIN — for body‑control communications on some variants
| Symptom | Likely Pin Issue | |--------|------------------| | No communication with scanner | OBD-II K-Line or CAN pins (check C5, C6, C7) | | Fuel pump doesn’t prime | FC (fuel pump relay) pin missing +12V IG | | No spark | IGT/IGF signal pins from distributor/coil | | 5V sensor reads 0V | VCC pin shorted or ECU dead | CAN H / CAN L — differential pair