If your specific 89661 unit does not match the 22R-E configuration above (e.g., it is for a V6 Camry or Corolla), use this standard Toyota legend to decipher the wires.
These must have battery voltage (12V) for the ECU to boot. toyota 89661 ecu pinout
| Connector | Pin | Function | Wire Color | Signal | | :--- | :--- | :--- | :--- | :--- | | A | 15 | OCV+ (VVT-i) | Red-Blue | 12V PWM | | B | 5 | THW (Coolant) | Yellow-Green | 0.2V-4.5V (NTC) | | C | 3 | STP (Brake Switch) | Green-White | 12V when braking | | C | 19 | W (CEL) | Red-Yellow | 0V when error | If your specific 89661 unit does not match
This is common on water-damaged 89661 units (especially in RAV4s and Corollas). toyota 89661 ecu pinout
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