1kz Ecu Pinout «95% POPULAR»

Solution: The 1KZ-TE tach signal is a 0-12V square wave, but some old tachometers (diesel mechanical) expect a different waveform. Install a tachometer adapter (e.g., Dakota Digital SGI-8) or add a 1k ohm pull-up resistor between C3 and A1.

| Pin | Function | Signal / Notes | |-----|------------------------------|------------------------------------------| | 1 | Battery +12V (main) | Constant power | | 2 | Ground | ECU ground | | 3 | Ignition switch +12V (IG) | Switched power | | 4 | Fuel injection pump – spill valve | Actuator control | | 5 | Fuel temp sensor | Signal | | 6 | Engine coolant temp sensor | Signal | | 7 | Accelerator position sensor (main) | 0-5V output | | 8 | Accelerator position sensor (sub) | Redundant signal | | 9 | Crankshaft position sensor + | Reluctance or Hall effect | | 10 | Crankshaft position sensor - | Signal return | | 11 | Camshaft position sensor | G signal (if equipped) | | 12 | Tachometer output | To cluster (diesel tach) | | 13 | Check engine light | Ground when fault | | 14 | Diagnostic enable (TE1) | Ground to enable diagnostic mode | | 15 | Diagnostic data (TC) | E1–TC1 jumper for flash codes | | 16 | Glow plug relay control | Output to relay | | 17 | EGR vacuum solenoid | Output | | 18 | Fuel cut solenoid | +12V during run (anti-theft) | | 19 | Injection timing control valve | For spill collar (early) or EDU | | 20 | Neutral start switch (AT) | Ground in P/N | | 21 | AC cut request | To ECU from AC amplifier | | 22 | Alternator L-terminal | Charge lamp / excitation |

Note: Pins 4, 19, 20 may vary by model year and transmission type.

| Pin | Signal | Notes | |-----|--------|-------| | B1 | #10 (Injector 1) | To spill control valve? No – wait: 1KZ-TE has no unit injectors – it has a rotary pump with electronic spill valve | | B2 | #20 (Injector 2) | Not used – correction: 1KZ-TE uses spill valve control from pump | | Actually – Key signals on B: | | | B6 | PCV (EGR vacuum control) | | | B7 | VSV (Fuel pressure up – cold start) | | | B8 | RSC (Rotational speed control – spill valve) | Main fuel quantity control | | B9 | TCV (Timing control valve) | Injection timing | | B10 | FSV (Fuel shutoff valve) | Stop solenoid | | B12 | IACV (Idle air control) | Stepper motor |

Correction for injectors: The 1KZ-TE uses an electronic distributor-type injection pump (Denso) – no high-pressure injector drivers in ECU. The pump has a spill valve (RSC) and timing valve (TCV). 1kz ecu pinout

Solution: Check pin A18 (EDU) or C11 (FC). If the fuel cut solenoid loses ground through the ECU, the engine dies. On many swaps, people bypass this by wiring the fuel cut solenoid directly to the ignition switch (12V), but this prevents the ECU from cutting fuel for anti-run-on. It’s safer to let the ECU control it.

Scenario: 1995 Toyota Hilux Surf (1KZ-TE) drives fine for 20 minutes, then dies. After cooling for 1 hour, it restarts.

Misdiagnosed as: Bad injection pump ($2,000 repair quote).

Actual problem found using 1KZ ECU pinout: Solution: The 1KZ-TE tach signal is a 0-12V

Fix: Cleaned and re-pinned ground circuit. Cost: $0.

Lesson: Always start with the pinout. Never throw parts at a diesel ECU until you verify voltage, ground, and signal at the pins.

Note: Please verify wire colors with your specific year model. Toyota sometimes changed wire colors between production years. Correction for injectors: The 1KZ-TE uses an electronic

(Plug 1 - Injection System) | 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 |

(Plug 2 - Sensors & Pump Control) | Pin | Name | Description | Wire Color (Typical) | | :--- | :--- | :--- | :--- | | 1 | SPD | Speed Sensor | Pink | | 4 | THW | Coolant Temp | Green/White | | 5 | THA | Intake Air Temp | Light Green/Red | | 9 | ELS | Electrical Load | Green/White | | 10 | W | Check Engine Light | Yellow/Red | | 15 | TCO | A/C Compressor Signal | | | 16 | TACH | Tachometer Output | Black/Orange | | 22 | TE1 | Diagnostic Terminal | Light Green/Red |

(Plug 3 - Control System) | Pin | Name | Description | Wire Color (Typical) | | :--- | :--- | :--- | :--- | | 1 | TPS VCC | Throttle Position Power | Yellow | | 2 | TPS VTA | Throttle Position Signal | Green/Yellow | | 3 | TPS IDL | Idle Switch | Blue/Yellow | | 9 | NSW | Neutral Start Switch | Black/White | | 11 | E2 | Sensor Ground | Brown |