Toyota 89661 Ecu Pinout -

Fuel injector triggers (sequential or grouped firing).

(Corolla, Camry, RAV4). Use only as a starting point— verify every pin .

The prefix 89661 is Toyota’s factory part number designator for an Engine Control Module (ECM) or Powertrain Control Module (PCM) . These are not generic parts; they are vehicle-specific. Over the past two decades, Toyota and their subsidiary Denso have produced hundreds of ECUs starting with 89661. toyota 89661 ecu pinout

The main ECU ground (usually connects to the intake manifold).

The 89661 prefix is most commonly found on ECUs for: Fuel injector triggers (sequential or grouped firing)

Oxygen sensor signal inputs and their respective heater control circuits. Common Layout Variants of the 89661 Series 1. Late 80s to Mid 90s (e.g., 4A-GE, 3S-GTE, Early 1UZ-FE)

If you need to power up an 89661 ECU on a workbench to pull codes or flash a chip, you only need to connect a few vital pins. The prefix 89661 is Toyota’s factory part number

| Connector | Typical Color | Common Circuits | |-----------|---------------|------------------| | A (22-pin) | Gray or White | Injectors, ignition coils, power, grounds | | B (22-pin) | Gray | Sensors (TPS, MAP/MAF, ECT, IAT, CKP, CMP) | | C (16-22 pin) | Black or Blue | Solenoids (VVT, EGR, purge), fuel pump relay, CEL | | D (if present) | Black | Immobilizer, diagnostics (K-Line, CAN low/high) |

: 5V reference voltage output for sensors like the TPS.

The Toyota 89661 series of Engine Control Units (ECUs) represents a massive catalog of computers used across decades of vehicles, from the legendary 1JZ/2JZ platforms to the reliable 1MZ-FE and 3RZ-FE engines. Because the part number 89661 is the prefix for almost all Toyota ECUs, identifying the correct pinout requires looking at the specific five-digit suffix (e.g., 89661-30430) and the connector shape.

Typically 4 to 5 grey or white connectors, utilizing smaller, higher-density pins to accommodate advanced emissions and automatic transmissions. 3. All-in-One Engine Bay Connectors (Mid 2000s – Present) Common Engines: 1GR-FE, 2GR-FE, 1ZZ-FE, 2ZR-FE.