Toyota 89661 Ecu Pinout -

: Fuel Injector drivers (pulls to ground to open injectors).

Connect a fused 12V line straight from the battery to BATT .

: 4A-GE (AE92/AE101), 3S-GTE (Gen 2/3), 1UZ-FE (Early LS400), 7M-GTE. The Grey Plug Era (Mid 1990s – Early 2000s)

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

IGT (Timing Signal), IGF (Feedback from Igniter) . toyota 89661 ecu pinout

Ignition switch signal that tells the ECU to wake up when the key is turned to "ON".

Every Toyota ECU features a 10-digit OEM part number format: .

Because no single diagram covers every 89661 unit, follow these steps to source the exact pinout for your project: Step 1: Document the Full Label

A signal wire that tells the ECU the ignition key has been turned to the "ON" position. 2. Ground Pins : Fuel Injector drivers (pulls to ground to open injectors)

Injector driver circuits. In older batch-fire systems, multiple cylinders share a pin. On sequential injection setups, each cylinder gets an individual number pin matching its firing order. 4. Sensor Inputs (Analog and Digital)

Constant 12V power from the battery. +B / +B1 (#22, #23): Switched 12V power from the EFI relay. IGSW (#9): Ignition switch signal to wake up the ECU.

Before pinning out your board, you must identify the physical connector style of your Denso/Toyota ECU. Generation classifications generally fall into three eras: The Yellow/Grey Plug Era (Late 1980s – Mid 1990s) 4A-GE, 3S-GTE, 1UZ-FE (early), 7M-GE.

| | 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 | The Grey Plug Era (Mid 1990s – Early

Because "89661" covers hundreds of different computers spanning four decades, there is no single universal pinout. However, Toyota follows a highly consistent naming convention and architectural logic across their wiring diagrams. Core Power and Ground Pins

: Ignition trigger signals sent to the ignition coils to initiate spark. #10, #20, #30 : Negative trigger signals for the fuel injectors.

(Invoking related search suggestions.)

EFI Relay control output. The ECU switches this on to ground the EFI relay coil, powering up the system. E1: Main chassis ground.

Engine load inputs. PIM represents the MAP sensor signal (Pressure Intake Manifold); VG represents the MAF sensor signal (Volume of Gas). THW: Water/Coolant Temperature Sensor signal. THA: Intake Air Temperature (IAT) Sensor signal.

If you cannot find a reliable diagram online, Toyota provided an excellent fail-safe mechanism on many 89661 ECUs.