Ecu Pinout — 1kz

By mastering the ECU layout, you eliminate the guesswork out of maintenance, allowing your 1KZ-TE to run reliably for hundreds of thousands of kilometers.

Replacing the factory ECU with a programmable unit (like MaxxECU or Link) to enhance performance and manage boost.

Leave out: EGR, immobilizer, AC idle-up, fuel heater, and vehicle speed sensor (unless you want cruise control).

If you are doing a swap and need to get the engine running on a standalone harness, these are the pins you need to focus on first.

Unlike modern common rails, the 1KZ-TE uses a separate Injection Driver Unit (often mounted near the ECU or under the passenger kick plate). You cannot just wire the ECU; you must wire the EDU as well. The ECU sends a signal to the EDU, which then drives the injectors. 1kz ecu pinout

Without clean power and solid grounding, the 1KZ-TE ECU will fail to trigger the Spill Control Valve, resulting in a "crank, no start" condition.

The SPV wiring is extremely sensitive. Ensure high-quality connections as loose wires will lead to poor running, surging, or a complete failure to start. Why You Need the Pinout Understanding the 1KZ ECU pinout is essential for:

The most critical pin. The ECU switches the spill valve ground on and off to control the exact volume of fuel injected into the cylinders.

Ensure E1 , E01 , and E02 are cleanly grounded directly to the engine block or a solid chassis ground. By mastering the ECU layout, you eliminate the

If the terminal is triggered, common codes include: Code 13 : No Crankshaft Position Sensor signal. Code 14 / 15 : Igniter circuit malfunctions (IGT). Code 42 : Vehicle Speed Sensor (SP1) signal issue.

Connect to your ignition key switch (hot in the "ON" and "START" positions).

Essential for cold starts and glow plug timing.

Wire the BATT pin directly to a fused 12V battery source. If you are doing a swap and need

Drive-by-wire system (Electronic Throttle Control System or ETCS-i). The accelerator pedal has an integrated position sensor.

Below are the critical pins found on the most common 26-pin + 16-pin + 22-pin configurations (found in later model Prados/Surfs).

: Spill Control Valve, which regulates fuel injection volume. TCV : Timing Control Valve for injection timing. S-REL / M-REL : Relays for the spill valve and main power. Grounds : E01 / E02 : Engine grounds. E1 / E2 : Sensor grounds. Standard Voltage Reference (While Idling)