Toyota 89661 Ecu Pinout Jun 2026

Toyota ECUs evolved through three distinct physical styles from the late 1980s to the present day. Identifying your plug style is the first step to mapping the pins. 1. Yellow/Gray Plastic Connectors (Late 80s – Mid 90s)

The primary chassis ground for the ECU casing and internal digital logic.

A: Toyota ECUs have used 2, 3, or 4 main connectors depending on the generation and feature set (VVT-i, electronic throttle, etc). Match the number and shape of connectors to your unit.

Oxygen Sensor signal and Oxygen Sensor Heater control. Communication & Body Controls toyota 89661 ecu pinout

: Many older Toyota ECUs have the pin abbreviations (like BATT, E1, IGT) printed directly on the circuit board next to the connector pins, accessible by removing the aluminum cover. Factory Service Manuals (FSM) : Official documentation like the Toyota Global Service Information Center (GSIC) or third-party resources like Malmatronic provide the most reliable wiring diagrams. Community Databases : For engine swaps (like the 1UZ-FE), sites like are common for finding pinouts for specific part numbers. To help you find the exact pinout, could you provide the full 10-digit part number (e.g., 89661-XXXXX) and the vehicle model Ecu pinout for 89661-3a080?

Proper pinout documentation is critical for engine swaps. Many forums report successful swaps using 89661 ECU pinouts, including , where the owner found the VSS pin for speedometer to fix transmission shifting.

A full Toyota ECU part number looks like: 89661-XXXXX (e.g., 89661-06A90 , 89661-33240 , 89661-52N10 ) Toyota ECUs evolved through three distinct physical styles

1JZ-GTE, 2JZ-GTE (Non-VVTi & VVTi), 3S-GE, 5VZ-FE.

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

Ensure both pins read 12V when the key is turned to the ON position. Yellow/Gray Plastic Connectors (Late 80s – Mid 90s)

: Constant +12V power from the battery used to maintain the ECU's memory.

| | Symbol | Wire Color | Description | | :--- | :--- | :--- | :--- | | Connector Y (22-pin) | | 22 | BATT | R-W | Battery +12V | | 21 | | | | | 20 | | | | | 19 | | | | | 18 | | | | | 17 | W | W | Check Engine Light | | 16 | FPR | L-Y | Fuel Pressure Regulator VSV | | 15 | | | | | 14 | | | | | 13 | | | | | 12 | L | L | Idle switch signal | | 11 | P | P | Neutral start switch (A/T) | | 10 | NSW | B-R | Park/Neutral Position Switch | | 9 | +B | B-R | +12V from EFI Main Relay | | 8 | STA | R-B | Starter signal | | 7 | | | | | 6 | ACT | LG-B | A/C amplifier signal | | 5 | L1 | G-O | Lock-up solenoid (A/T) | | 4 | VF | R-W | Diagnostic test signal | | 3 | ACC | G-R | A/C cut relay signal | | 2 | S2 | | Shift solenoid #2 (A/T) | | 1 | S1 | | Shift solenoid #1 (A/T) | | Connector X (26-pin) | | 15 | G2 | | Distributor pickup #2 | | 14 | G1 | | Distributor pickup #1 | | 13 | | | | | 12 | | | | | 11 | | | | | 10 | | | | | 9 | | | | | 8 | G- | | Distributor pickup ground | | 7 | NE | | Distributor NE (360° signal) | | 6 | HT | R-B | Oxygen sensor heater | | 5 | | | | | 4 | | | | | 3 | VTA | R | TPS signal | | 2 | VC | Y-B | +5V sensor power | | 1 | E2 | BR | Sensor ground | | Connector Z (16-pin) | | 16 | OX | B | Oxygen sensor signal | | 15 | E1 | BR-B | Engine ground | | 14 | E01 | BR | Power ground | | 13 | E02 | BR | Power ground | | 12 | | | | | 11 | | | | | 10 | EVP | | EGR Vacuum VSV | | 9 | | | | | 8 | | | | | 7 | | | | | 6 | | | | | 5 | IGF | B-Y | Igniter confirmation signal | | 4 | IGT | B | Ignition timing signal | | 3 | THW | W | Coolant temperature sensor | | 2 | #30 | | Fuel injectors #1, #3 (group 1) | | 1 | #20 | | Fuel injectors #2, #4 (group 2) |

: While some pinouts are available on enthusiast forums, many users find that paying for professional guidance through verified platforms is often faster when dealing with specific, rare part numbers.