| | Full Name | Function | | :--- | :--- | :--- | | BATT, +B, +B1 | Battery | Permanent 12V power to keep the ECU's memory alive | | E, E01, E02 | Ground | The main power and sensor grounds for the ECU | | IGSW, IGSW | Ignition Switch | 12V signal telling the ECU to turn on when the key is in the "RUN" or "START" position | | VCC, VC | Sensor Power | A precise +5V output used to power sensors like the TPS and MAP sensor | | E2, E21 | Sensor Ground | The dedicated ground return path for the +5V sensor power circuit | | VTA | Throttle Position | Signal from the Throttle Position Sensor (TPS) | | OX, OX1 | Oxygen Sensor | Signal from the front air-fuel ratio (A/F) sensor | | KNK | Knock Sensor | Signal from the knock sensor, used to detect engine knocking | | IGT, IGF | Ignition Timing | 'IGT' is the timing signal from ECU to igniter; 'IGF' is a confirmation signal returned to the ECU | | INJ (#) | Fuel Injector | The ground switching signal for a specific fuel injector | | VSS, SPD | Vehicle Speed Sensor | A pulsed signal used to calculate vehicle speed | | STP, BRS | Brake/Stop Signal | Signal from the brake light switch, used by the ECU and transmission computer | | W, CEL, MIL | Warning Light | The wire that activates the Check Engine Light on the dashboard | | TE1, TE2 | Test Connector | Pins used in the diagnostic connector to read engine codes | | CANH / CANL | CAN High/Low | The two wires for the Controller Area Network (CAN) bus, used for high-speed data communication between modules | | K-Line (ISO 9141-2) | K-Line | Another communication line for diagnostics and programming, used on some older and modern Toyota ECUs | | TXCT / RXCT | Programming | Transmit and receive data lines used for boot mode programming on newer ECUs |
If you are using a pinout to solve a "No Start" condition, check these three pins in order:
: Identifies the specific vehicle model, engine generation, market destination (JDM, USDM, EUDM), and transmission type (Manual vs. Automatic). toyota 89661 ecu pinout
Power grounds specifically dedicated to high-current driver circuits inside the ECU (like fuel injectors). 2. Ignition Control Pins (IG Systems)
Actuators & outputs:
Toyota uses a standardized set of abbreviations across most 89661 models. Knowing these allows you to decipher diagrams even if they lack a detailed legend. Key symbols include (Battery), (Relay Power), (Ignition), (Engine Ground), and (Sensor Ground). Engine management signals include (Injectors), (Ignition), (Water Temp), (Throttle), (Speed), and (Check Engine). 2. Identifying Pinouts by Engine Family The "89661" suffix determines the specific engine type. Toymods Car Club Toyota Lexus ECU 89661-50102 repair
: Crankshaft position sensor signals (engine speed). | | Full Name | Function | |
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End your research here if you already have your exact 10-digit number. If you are troubleshooting a specific swap project, I can help you narrow down the exact diagram. Please let me know: Please let me know: