Pinout: Toyota 89661 Ecu

Finding a specific pinout for a Toyota ECU with the part number 89661 can be challenging because that number is actually the prefix for hundreds of different Toyota Engine Control Units (ECUs).

The number 89661 simply identifies the unit as an Engine Control Module. The numbers after the dash (e.g., 89661-XXXXX) denote the specific vehicle, engine, and region.

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). toyota 89661 ecu pinout

Step 2: Power and Ground Verification

Using a Digital Multimeter (DMM):

1. Check voltage between BATT and E1. Should be ~12V with the car off.
2. Check voltage between +B and E1. Should be ~12V with the key ON. If 0V, check the EFI Main Fuse and EFI Main Relay.
3. Check continuity between E1 and the vehicle chassis ground. Must be less than 0.5 Ohms.

7. Important Warnings

• Do not probe with a test light – Toyota ECUs use low-current logic. Use a multimeter or oscilloscope.
• Do not swap ECUs with the same 89661 prefix but different suffix – immobilizer, pinout, and fuel mapping differ.
• Hybrid ECUs (e.g., 89661-47010) have high-voltage interlock pins – never probe those.

Power and Ground

• BATT: Battery Positive (Direct power from battery).
• +B, +B1: Main Relay Power (Switched 12V).
• E1, E2: Earth (Ground).
• E01, E02: Earth for power actuators (Injectors).

1. Understand the 89661 Numbering

A full Toyota ECU part number looks like:
89661-XXXXX (e.g., 89661-06A90, 89661-33240, 89661-52N10) Finding a specific pinout for a Toyota ECU

• The suffix (after the dash) is critical.
• 89661-06... → Early 2000s V6 (e.g., Camry, Highlander)
• 89661-33... → Corolla/Matrix 1ZZ-FE
• 89661-60... → Land Cruiser / Tundra V8
• 89661-52... → Prius / Hybrid systems

⚠️ Never assume pinout from the prefix alone. Always use the full 10-digit number on the ECU label.

Input Sensors (Signal)

| Pin No. | Symbol | Description | Function | | :--- | :--- | :--- | :--- | | NE+ / NE- | Crank Angle | Distributor Pickup Coil | RPM Signal | | G+ / G- | Cam Position | Distributor Pickup Coil | Cylinder ID | | THW | Temp Sensor | Engine Coolant Temp | Cold Start Enrichment | | THA | Temp Sensor | Intake Air Temp | Air Density Correction | | VG | Volume Air Flow | Vane/Flap Air Flow Meter | Air Volume Measurement | | VC | VCC | 5V Output to Sensors | Powers TPS/AFM | | IDL | Idle Switch | Throttle Position Sensor | Idle Circuit Activation | | VTA | Throttle Angle | Throttle Position Sensor | Throttle Opening % | | OXL | Oxygen Sensor | Left Bank O2 Sensor | Fuel Trim Feedback | | KNK | Knock Sensor | Engine Knock Detection | Timing Retard | Check voltage between BATT and E1

5. Common Pitfalls

❌ Assuming all 89661 ECUs are the same – They are not. A 89661-02020 (MR2 Turbo) has a completely different pinout than a 89661-2F210 (Camry).
❌ Using a pinout for a different transmission type – Auto and manual ECUs swap several pins (neutral switch, PNP signals).
❌ Mixing up connector numbering – Some diagrams number left-to-right, others right-to-left. Look for a molded “1” on the connector.

Common Vehicle Applications

| Suffix Example | Vehicle | Engine | |----------------|---------|--------| | 89661-0W590 | Toyota Camry 2007-2011 | 2AZ-FE (2.4L) | | 89661-33260 | Toyota Corolla 2005-2008 | 1ZZ-FE (1.8L) | | 89661-06A70 | Toyota Prius 2004-2009 | 1NZ-FXE (1.5L Hybrid) | | 89661-0P130 | Toyota RAV4 2006-2012 | 2AZ-FE | | 89661-30490 | Toyota Highlander 2008-2013 | 2GR-FE (3.5L V6) |

Critical: Always verify the full 10- or 12-digit part number on your ECU’s label before referencing any pinout.