Measures manifold absolute pressure (boost). The ECU reads this to scale fuel delivery relative to turbo boost.
Mechanically driven odometer support, basic diagnostics (OBD1 via diagnostic box under the hood), and vacuum-switched valve (VSV) controls for EGR. 2. The Late Generation (Post-2000 / Intercooled)
While exact pin locations change between the 3-plug and 4-plug variants, the vital signals required to make a 1KZ-TE start and run remain identical. If you are wiring an engine swap on a standalone harness, these are the wires you must focus on. Power and Ground Circuit
Below is a functional mapping of a common 1KZ-TE 3-plug ECU (frequently found in KZN130 / KZN185 Surfs and KZJ95 Prados). 1kz ecu pinout
The 1KZ-TE ECU typically uses : A, B, and C (sometimes labeled 1, 2, and 3). Depending on the chassis (Prado vs. Surf vs. Hiace), wire colors may vary slightly, but the pin functions remain largely consistent.
5V reference power supply output from the ECU to sensors like the TPS and Map Sensor. VTA: Throttle Position Sensor (TPS) signal output.
Use an oscilloscope or AC voltage setting on your DMM across NE+ and NE- while cranking. A lack of signal means a failed crankshaft/pump speed sensor, which completely blinds the ECU. The "Limp Mode" or Heavy Smoke Scenario Measures manifold absolute pressure (boost)
Understanding the is essential for anyone performing an engine swap, installing a tuning module, or troubleshooting electrical gremlins in a classic Toyota Hilux or Land Cruiser Prado. This guide provides a comprehensive breakdown of the core terminal configurations and essential wiring tips for this legendary 3.0L turbo diesel engine. Overview of the 1KZ-TE Engine Control Unit
Constant 12V battery power (for ECU memory and clock).
Permanent 12V battery power used to maintain the ECU’s fault code memory. Power and Ground Circuit Below is a functional
The glow plug system is controlled by the ECU but often requires a separate heavy-duty relay. Ensure the **Glow Control
| Pin | Wire Color | Signal Name | Function | Voltage / Signal | | :--- | :--- | :--- | :--- | :--- | | | Red/Blue | VTA1 | Throttle Position Sensor (TPS) Signal | 0.5V (Idle) – 4.5V (WOT) | | B2 | Black | E2 | TPS Sensor Ground | 0V | | B3 | Red/Yellow | VC | TPS Reference Voltage (5V output from ECU) | 5V | | B4 | N/A | N/C | Not Connected | - | | B5 | Green/White | THW | Engine Coolant Temp (ECT) Signal | 2.5V (Cold) → 0.3V (Hot) | | B6 | Red/Black | THA | Intake Air Temp (IAT) Signal | 3.0V (Cold) → 1.0V (Hot) | | B7 | Shield | E1 | Sensor Shield Ground (Crank/Cam signals) | 0V | | B8 | White | G2 | Crank Position Sensor – G2 (Ne/Ne+) | AC sine wave (1-5V during crank) | | B9 | Black | G- | Crank Position Sensor – G- (Ne-) | AC sine wave (inverse of G2) | | B10 | N/A | N/C | Not Connected | - | | B11 | N/A | N/C | Not Connected | - | | B12 | Yellow | STA | Starter Signal (crank sense) | 12V (While cranking only) | | B13 | Black/White | NSW | Neutral Start Switch (P/N signal) | 0V (In gear) / 12V (Park/Neutral) | | B14 | Brown/White | A/C1 | AC Switch Signal (to ECU) | 12V (AC ON) | | B15 | N/A | N/C | Not Connected | - | | B16 | Blue | SPD | Vehicle Speed Sensor (VSS) | Pulse (0-12V square wave) | | B17 | Black | E2 | Sensor Common Ground | 0V | | B18 | White/Green | G1 | Cam Position Sensor (G1 – Cylinder 1 TDC) | AC sine wave | | B19 | Red | G2e | Cam Position Sensor (G2 – Cylinder 4 TDC) | AC sine wave | | B20 | N/A | N/C | Not Connected | - | | B21 | N/A | N/C | Not Connected | - | | B22 | Light Green/Red | A/C2 | AC Compressor Clutch Feedback | 12V (Clutch engaged) |
Wire the SPV power feed through a high-quality 30A relay triggered by the ignition switch.
Connect E01 , E02 , and E1 directly to the engine block, and ensure the engine block has a heavy gauge earth strap to the battery chassis.