Looking at the ECU from the harness side (pins visible), connectors are arranged:
Pinouts for the 1MZ-FE vary significantly depending on the production year and the vehicle's specific technology. Early Non-VVT-i (1994–1998): 1mz-fe ecu pinout
Here are some common signals found in the 1MZ-FE ECU pinout: Looking at the ECU from the harness side
These use a dual-throttle body setup and often have a simpler, pre-OBDII or early OBDII architecture. 1 (SL1) | Automatic transmission | | D02
| Pin | Wire Color | Function | Application | | :--- | :--- | :--- | :--- | | D01 | G-B | Shift Solenoid No. 1 (SL1) | Automatic transmission | | D02 | Y-R | Shift Solenoid No. 2 (SL2) | Automatic transmission | | D03 | R-W | Lock-up Solenoid (SLU) | Torque converter clutch | | D04 | Y-G | Transmission Speed Sensor (SP2) | Output shaft speed | | D05 | V-W | Check Engine Light (MIL) | Ground to illuminate | | D06 | W-B | Diagnostic Port (TC) | Connect to TS for flash codes | | D07 | B-O | Transmission Speed Sensor (SP1) | Counter gear speed |
The Engine Control Unit (ECU) on a 1MZ-FE manages over 30 different inputs and outputs. Guessing which wire does what can fry a $500 ECU or melt a wiring harness.
| Pin | Function | Wire Color (Typical) | Notes | |-----|------------------------|----------------------|--------------------------------| | A1 | IGT1 (Ignition timing 1)| White | To igniter (cylinder 1) | | A2 | IGT2 | White/Black | Cylinder 2 | | A3 | IGT3 | White/Red | Cylinder 3 | | A4 | IGT4 | White/Blue | Cylinder 4 | | A5 | IGT5 | Yellow | Cylinder 5 | | A6 | IGT6 | Yellow/Black | Cylinder 6 | | A10 | +B (Main EFI relay) | Black/Red | 12V power to sensors/actuators | | A16 | E01 (Power ground) | Brown/White | High-current ground | | A17 | E02 (Power ground) | Brown/White | Second power ground | | A24 | STA (Starter signal) | Black/White | From ignition switch (START) | | A25 | BATT (Backup power) | White/Red | Constant 12V for keep-alive |