Toyota 89661 Ecu Pinout - Link
| Pin | Function | Typical Color | |-----|----------|----------------| | C1 | Diagnostic (TC/TE1) | Black/White | | C2 | Check engine light (CEL) | Green/Yellow | | C3 | MIL resistor (some models) | Not used | | C4 | EVAP purge VSV | Light Green/Black | | C5 | EVAP vent VSV | Green/White | | C6 | A/C clutch relay | Black/Blue | | C7 | Tachometer output | Black (single wire) | | C8 | +12V switched (IGN) | Black/Yellow | | C9 | Ground (ECU logic) | Brown | | C10 | Ground (ECU logic) | Brown | | C11 | CAN high (if equipped) | White | | C12 | CAN low (if equipped) | Red | | C13 | K-line (ISO 9141) | Violet/Yellow | | C14 | Immobilizer communication | Various | | C15 | Brake switch signal | Green/White | | C16 | Stop lamp monitor | Red/Black |
: Understanding Toyota's shorthand is critical for troubleshooting. For instance, BATT is constant power, IGSW is ignition switch power, and E1 is the main ground. A detailed Toyota ECU Pinout Abbreviations Guide is available for identifying signal types. toyota 89661 ecu pinout
| Pin No. | Symbol | Description | Function | | :--- | :--- | :--- | :--- | | | Injectors | Fuel Injector Drivers | Ground Pulse to Injectors | | IGT | Ignition | Ignitor Trigger Signal | Fires Ignition Coil | | IGF | Ignition | Ignitor Confirmation | Confirms Spark Occurred | | ISCC / ISCO | IACV | Idle Air Control Valve | Idle Speed Control | | SPD | Vehicle Speed | Speedometer Signal | Shift Logic/Speed Cut | | ACMG | A/C Clutch | Air Conditioner Mag Switch | A/C Load Compensation | | STA | Start Signal | Key Start Position | Cranking Enrichment | | Pin | Function | Typical Color |
: The sticker on the ECU case will have the full number (e.g., 89661-XXXXX). | Pin No