Toyota 89661 Ecu Pinout Patched Jun 2026

Finding a specific pinout for a Toyota ECU with the part number can be challenging because that number is actually the prefix for hundreds of different Toyota Engine Control Units (ECUs).

An ECU pinout is a map of the electrical connector terminals on the engine computer. Each "pin" or terminal is assigned a specific function, such as providing power, grounding a circuit, receiving sensor data (like coolant temperature or air flow), or sending signals to actuators (like fuel injectors or ignition coils). Why the Pinout Matters

Ignition Confirmation signal sent back from the igniter to the ECU. If the ECU misses this signal, it cuts fuel for safety.

The Toyota 89661 part number prefix denotes the Engine Control Unit (ECU) across a massive range of vehicles from the late 1980s through the 2000s. Whether you are swapping a 1JZ-GTE into a 240sx, wiring a 1UZ-FE v8 into a drift car, or troubleshooting a classic 4A-GE, understanding this specific ECU pinout is critical to making the engine run safely and efficiently. toyota 89661 ecu pinout

| | Connector Configuration | Typical Vehicle / Engine | Pin Count Details (if specified) | | :--- | :--- | :--- | :--- | | 89661-12390 (1988-89 Corolla AE92) | V, U, T (Three connectors) | 4A-GEL, US Market | Details shared, but not found in all results | | 89661-22740 | 34, 12, 16, 28 Pins (Four connectors) | 1JZ-GE VVTi | Four connectors | | 89661-17320 to -20761 | A, B, C, D (Four connectors) | MR2 Turbo (SW20), 3S-GTE | Four connectors | | 89661-4A250 (2004 RAV4) | (Not specified) | 1AZ-FE | Information not provided | | 89661-02E90 | 1-5/6-81pin, 82-113/114-121pin (Two connectors) | Auris 1.4 VVTI 4ZZ (Bosch) | Two large connectors | | 89661-3A470 | (Not specified) | JDM Aristo 2JZ-GTE VVTi (w/o Immobilizer) | Information not provided | | 89661-60250 (1KZ-TE) | 26P, 16P, 22P (Three connectors) | Land Cruiser Prado | Three connectors | | 89661-5C570 | (Not specified) | Aqua / Prius C (NHP10), 1NZ-FXE Hybrid | Information not provided | | 89661-42670 (Fujitsu) | (Not specified) | RAV4, Verso (M2) | Information not provided | | 89661-30560 / -30870 (JZS147 Aristo) | E10 Plug (Second ECU plug) | 2JZ-GTE (non-VVTi) | One of four connectors |

This specifies the exact vehicle model, engine variant, transmission type (manual vs. automatic), market destination (JDM, USDM, Euro), and production year.

provide pinouts specifically for bench flashing and "boot mode" operations. : For older JDM engines (like the LS400 1UZ-FE Finding a specific pinout for a Toyota ECU

If you are reading this, you likely have a Bosch-style Toyota ECU (Engine Control Unit) with the coveted part number prefix sitting on your workbench. Or, you might be staring at a tangled mess of wires under your dashboard after an engine swap. Either way, finding an accurate Toyota 89661 ECU pinout is your key to success.

Finding a "good blog post" or guide for these ECUs often requires matching your specific part number. Here are the best resources for identifying your wiring:

These communities are excellent for engine swaps (like swapping a 2ZZ-GE or 1ZZ-FE). Why the Pinout Matters Ignition Confirmation signal sent

This always denotes the "Computer, Engine Control" (ECU/ECM).

Multi-row, high-density locking lever connectors integrated into the engine bay harness. Step 3: Inspect the Internal PCB Markings

Note: Pin numbers are often stamped into the plastic behind the connector.