Toyota 89661 Ecu Pinout
| Pin | Function | Wire Color (typical) | |-----|----------|----------------------| | A1 | Injector #1 | Red or Light Green | | A2 | Injector #2 | Yellow or Light Green | | A3 | Injector #3 | Blue or Light Green | | A4 | Injector #4 | White or Light Green | | A5 | Ignition coil #1 | Black/Red | | A6 | Ignition coil #2 | Black/Red | | A7 | Ignition coil #3 | Black/Red | | A8 | Ignition coil #4 | Black/Red | | A9 | EGR vacuum solenoid | Red/White | | A10 | Fuel pump relay control | Blue/Red or Green/Red | | A11 | Main relay control | Yellow/Black | | A12 | +12V battery backup (constant) | White/Red | | A13 | Ground (ECU power) | Brown/White | | A14 | Ground (ECU power) | Brown/White | | A15 | +12V from main relay (switched) | Black/Yellow | | A16 | +12V from main relay (switched) | Black/Yellow | | A17 | O2 heater (front) | Black/White | | A18 | O2 heater (rear) | Black/White | | A19 | Idle air control (IAC) – open | Red/White | | A20 | Idle air control (IAC) – close | Red/Black | | A21 | VVT solenoid (if equipped) | Yellow/Black | | A22 | Cooling fan relay | Green/Black |
If you are swapping a JDM engine with a matching 89661 ECU into a classic Toyota (e.g., 3S-GTE into a 1986 MR2): toyota 89661 ecu pinout
When diagnosing a 89661 ECU, follow these standard procedures: | Pin | Function | Wire Color (typical)
| Suffix Example | Common Vehicle | Engine | Key Pinout Differences | | :--- | :--- | :--- | :--- | | -0D030 / 0D090 | Toyota Land Cruiser (J100/J120) | 2UZ-FE (V8) | 4 Oxygen sensors, IMMO box communication, 5-speed auto | | -2J170 / 2J180 | Toyota Hilux / Fortuner (AN10/AN20) | 1GR-FE (V6) / 2KD-FTV | Mechanical throttle position sensor, diesel glow plug control | | -1A240 | Toyota Corolla (E120/E130) | 1ZZ-FE / 3ZZ-FE | VVT-i solenoid, knock sensor, 4-speed auto logic | | -0D040 | Toyota RAV4 (ACA2#) | 2AZ-FE | Electronic throttle (ETCS-i), LIN bus for alternator | | -0D100 | Toyota Camry (ACV30) | 2AZ-FE | Immobilizer coil driver built-in | IMMO box communication
The Takeaway: Before you look for a pinout, locate the full 10-12 digit number on the sticker attached to the metal casing of the ECU.