^new^ | Toyota 89661 Ecu Pinout

Camshaft position sensors used to establish cylinder sequential timing. VTA / VTA2: Throttle Position Sensor (TPS) signal inputs. THA: Intake Air Temperature (IAT) sensor input. THW: Engine Coolant Temperature (ECT) sensor input.

The full Toyota part number follows a 89661-XXXXX format. The five digits after the hyphen dictate the exact board layout, vehicle model, and engine variant.

EFI Relay control output. The ECU switches this on to ground the EFI relay coil, powering up the system. E1: Main chassis ground. toyota 89661 ecu pinout

Ignition Trigger signal sent from the ECU to the igniter/coil to fire the spark plug.

The Toyota 89661 series can seem confusing at first, but you now have the framework to decode any pinout—whether it's a classic 90s MR2 turbo, a 2004 Rav4, or a 2018 Camry. , trace wires carefully, and use pin functions as a road map rather than a definitive answer. THW: Engine Coolant Temperature (ECT) sensor input

Engine load inputs. PIM is used for Manifold Absolute Pressure (MAP) sensors, while VG (V-Grounded) denotes Mass Air Flow (MAF) signals. VTA / VTA1: Throttle Position Sensor (TPS) signal. THW: Coolant Temperature Sensor input (Thermistor Water). THA: Intake Air Temperature Sensor input (Thermistor Air).

Often uses a three-plug configuration with 26-pin, 16-pin, and 22-pin connectors. Late 1990s (e.g., 1UZ-FE UCF20): Features 34-pin, 22-pin, 16-pin, and 28-pin connectors. Modern Models (2015+): EFI Relay control output

Multi-row, high-density configurations (often 4 or 5 blocks grouped together).

3. The Sealed Engine-Bay Plastic Blocks (Mid 2000s – Present) 2GR-FE, 1NZ-FE, 3UR-FE.

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