Toyota 89661 Ecu Pinout [2021] Access
Newer units (e.g., 89661-52592 for Yaris ) shift to high-density connectors : High and Low communication lines . W (Check Engine): Diagnostic light trigger . SPD: Speed sensor input for the odometer and logic . How to Find Your Specific Diagram To get a printable "paper" diagram for your exact unit: Toyota ECU Parts Inventory List | PDF - Scribd
Remove the Phillips head screws securing the metal cover of the ECU.
Always look for the plastic locking tab. Most diagrams orient the connector with the locking tab at the top. toyota 89661 ecu pinout
| Pin No. | Symbol | Description | Function | | :--- | :--- | :--- | :--- | | | Crank Angle | Distributor Pickup Coil | RPM Signal | | G+ / G- | Cam Position | Distributor Pickup Coil | Cylinder ID | | THW | Temp Sensor | Engine Coolant Temp | Cold Start Enrichment | | THA | Temp Sensor | Intake Air Temp | Air Density Correction | | VG | Volume Air Flow | Vane/Flap Air Flow Meter | Air Volume Measurement | | VC | VCC | 5V Output to Sensors | Powers TPS/AFM | | IDL | Idle Switch | Throttle Position Sensor | Idle Circuit Activation | | VTA | Throttle Angle | Throttle Position Sensor | Throttle Opening % | | OXL | Oxygen Sensor | Left Bank O2 Sensor | Fuel Trim Feedback | | KNK | Knock Sensor | Engine Knock Detection | Timing Retard |
If your specific 89661 unit does not match the 22R-E configuration above (e.g., it is for a V6 Camry or Corolla), use this standard Toyota legend to decipher the wires. Newer units (e
| Pin | Signal | Notes | |-----|----------------|-------| | B1 | +B (Main relay output) | Switched 12V to sensors | | B2 | +B2 (Injector power) | | | B3 | MREL (EFI main relay control) | ECU grounds to energize relay | | B4 | E01 (Power ground) | To engine block | | B5 | E02 (Power ground) | | | B6 | E03 | | | B7 | #10 (Injector 1) | ECU grounds injector | | B8 | #20 (Injector 2) | | | B9 | #30 (Injector 3) | | | B10 | #40 (Injector 4) | | | B11 | #50 (Injector 5 – V6) | | | B12 | #60 (Injector 6 – V6) | | | B13 | FC (Fuel pump control) | To fuel pump relay | | B14 | FPR (Fuel pressure regulator) | For returnless systems | | B15 | VSV (VVT oil control valve) | Variable valve timing solenoid | | B16 | EGR (EGR vacuum solenoid) | | | B17 | PRG (Purge VSV) | Evaporative emissions | | B18 | IAC1 (Idle air control – close) | | | B19 | IAC2 (IAC – open) | | | B20 | FAN (Cooling fan relay) | | | B21 | CEL (Check engine light) | To instrument cluster | | B22 | TC (Diagnostic test connector) | |
If you reply with your number, I can narrow it down to a specific family (e.g., V6 Camry, 4-cylinder Corolla, Tundra V8) and give you typical pin functions for that generation. How to Find Your Specific Diagram To get
The main ECU ground (usually connects to the intake manifold).
This is tedious but reliable for missing pinouts.