| | Vehicle Models | Engine | |---|---|---| | 89661-4A250 | Rav4 2004 4WD | 1AZ-FE / 2AZ-FE | | 89661-42680 | Toyota RAV4 ACA2# | 1AZ-FE | | 89661-33C01 / 33F90 | Camry V40 2.4L | 2AZ-FE | | 89661-12P30 | Corolla Axio E140 | 1NZ-FE | | 89661-17300 | MR2 Gen 2 3SGE | 3S-GE | | 89661-1A080 | Corolla E10 1.3 | 4E-FE | | 89661-33T40 | Camry 2018 | 2GR-FKS |
Introduced alongside VVTi technology and OBD2 compliance. These plugs have smaller pins, latches integrated into the bracketry, and complex split routing where half the plugs belong to the engine harness and the other half belong to the vehicle's dash/fuse box loom. How to Safe-Wire an 89661 ECU for a Standalone Engine Swap
Despite the vast differences between variants, the 89661 family retains a common electrical philosophy. The following circuits are almost always found on the same relative positions or same color wires across the series. toyota 89661 ecu pinout
A: You need the full part number (the 5 characters after the dash) and the specific vehicle model/year. Check Toyota forums for your specific ECU.
Example: 89661 - 3A490 │ │ ECU Prefix Unique Model & Market Code | | Vehicle Models | Engine | |---|---|---|
Sensor ground return loop (strictly reserved for shielding sensitive sensors). Sensor Inputs (Signals)
A wrong pinout costs you time and money. The right one makes you a wiring hero. The following circuits are almost always found on
Crankshaft Position Sensor signal (essential for engine timing and RPM calculation). G1 / G2 / G+: Camshaft Position Sensor signals. THA: Intake Air Temperature (IAT) sensor input. THW: Engine Coolant Temperature (ECT) sensor input. VTA / VTA2: Throttle Position Sensor (TPS) signal voltage.
Toyota’s part numbering system breaks down as follows:
Most Toyota ECUs of the 89661 series use :
Remove the ECU cover (usually two screws or clips).