Connector B (16-Pin): Transmission (ECT) and Cockpit Interface
Below are the critical pins found on the most common 26-pin + 16-pin + 22-pin configurations (found in later model Prados/Surfs).
The following table lists some of the most common and critical signals found on the 1KZ-TE ECU. Use this as a starting point to verify functionality: 1kz ecu pinout
In this blog post, we'll dive into the details of the 1KZ ECU pinout, providing you with a comprehensive guide to help you navigate the complexities of the engine's electrical system.
Controls the fuel quantity injected into the cylinders. TCV (Timer Control Valve): Adjusts injection timing. S-REL: Glow plug relay control. W: Check Engine Light (MIL) output. Variations Between Models Controls the fuel quantity injected into the cylinders
| Pin | Name | Description | Wire Color (Typical) | | :--- | :--- | :--- | :--- | | 1 | IGSW | Ignition Power | Black/White | | 3 | E01 | Engine Ground | Brown | | 5 | #10 | Injector 1 | Red | | 6 | #20 | Injector 2 | White | | 7 | #30 | Injector 3 | Green | | 8 | #40 | Injector 4 | Blue | | 9 | E1 | Sensor Ground | Brown | | 10 | +B | Battery Power | Black/Orange | | 12 | STA | Starter Signal | Black/White |
Before you start probing wires, identify your ECU part number. While the pinouts are largely consistent across the 1KZ-TE range, there are slight variations between automatic and manual transmissions, and early vs. late models. W: Check Engine Light (MIL) output
The main 1KZ ECU connector has 28 pins, which are divided into several sections:
Main chassis ground for the ECU casing and logic circuit.
Before probing wires, you must identify your specific ECU variant. Toyota updated the plug designs and pin configurations across production years:
: An ECU from an automatic transmission vehicle (A/T) will have pins for the Electronic Controlled Transmission (ECT). Running this ECU in a manual vehicle (M/T) may store fault codes and affect drivability. Conversely, an M/T ECU in an A/T vehicle will fail to control the gearbox correctly.