→ EFI fuse (15A) → Main EFI relay (contacts) → ECU pin A1 (constant power) → Injectors +12V → Air flow meter (if hot-wire type) +12V
Introduction The Toyota 7K engine is a 1.8-liter (1781 cc) inline-4 gasoline engine, part of Toyota’s long-running K-series. While most 7K engines were carbureted (7K-C), a less common but highly sought-after variant is the 7K-E , which features electronic fuel injection (EFI) . This engine is found in markets such as Japan, Southeast Asia, Australia, and South Africa, typically in commercial vans (Toyota Hiace, Toyoace), forklifts, and some sedan applications (Toyota Corona). toyota 7k ecu wiring diagram
Below is the from factory Toyota wiring diagrams (e.g., Hiace RZH10 series, 1995–1998). Connector A (22 pins) – Main Engine Control | Pin | Wire Color | Function | Signal Type | |------|------------|----------|--------------| | A1 | Black/Red | Battery +12V (constant) | Power | | A2 | White/Red | Main EFI relay control (to relay coil) | Output | | A3 | Black/Yellow | Starter signal (ST) | Input | | A4 | Black/White | Ignition switch IG +12V | Power | | A5 | Black | Ground (ECU power ground) | Ground | | A6 | Brown | Ground (ECU sensor ground) | Ground | | A7 | Yellow/Black | Check Engine Light (W) | Output | | A8 | Blue/Red | Tachometer output | Output | | A9 | Yellow/Green | Diagnostic (TE1 – connect to TE2 for diag mode) | I/O | | A10 | White/Black | Diagnostic (TE2) | I/O | | A11 | Green/Orange | Neutral start switch (NSW) – auto trans only | Input | | A12 | Green/Yellow | Air conditioner request signal (AC) | Input | | A13 | Red/Blue | Power steering oil pressure switch | Input | | A14 | Black/Orange | Fuel pump relay control (FP) | Output | | A15 | Red/White | Injector #1 | Output | | A16 | Blue | Injector #2 | Output | | A17 | Green | Injector #3 | Output | | A18 | Yellow | Injector #4 | Output | | A19 | Gray | Igniter (IGT) – ignition timing signal | Output | | A20 | Violet | IGF (ignition confirmation) – feedback from igniter | Input | | A21 | Pink | Throttle position sensor (VTA) | Analog input | | A22 | Blue/White | Throttle position sensor (IDL – idle contact) | Switch | Connector B (16 pins) – Sensors & Actuators | Pin | Wire Color | Function | Signal Type | |------|------------|----------|--------------| | B1 | Red/Green | Engine coolant temperature sensor (THW) | Analog input | | B2 | White/Green | Intake air temperature sensor (THA) | Analog input | | B3 | Black/Blue | Oxygen sensor (OX) – 1-wire or 4-wire | Analog (0–1V) | | B4 | Green/White | Distributor NE (crank position / 24° signal) | Digital | | B5 | Red/Black | Distributor G1 (cam position / 180° signal) | Digital | | B6 | Brown/Yellow | Distributor G2 (cam position – secondary) | Digital | | B7 | Blue/Black | Vehicle speed sensor (SPD) | Digital (pulse) | | B8 | White | ISC valve (idle speed control) – open coil | Output (duty) | | B9 | Black/Yellow | ISC valve – close coil | Output (duty) | | B10 | Green/Black | MAP sensor (manifold absolute pressure) – signal | Analog | | B11 | Red/Yellow | MAP sensor (VCC – 5V reference) | Power out | | B12 | White/Black | MAP sensor (E2 – sensor ground) | Ground | | B13 | Blue/Orange | EGR vacuum modulator (if equipped) | Output | | B14 | Not used | – | – | | B15 | Violet/White | A/C idle-up valve | Output | | B16 | Black/White | +B (ECU backup power – switched via EFI relay) | Power | 3. Power Distribution Diagram (Simplified) The 7K-E wiring follows this power path: → EFI fuse (15A) → Main EFI relay
[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] Below is the from factory Toyota wiring diagrams (e
→ IGN fuse (7.5A) → ECU pin A4 (ignition power) → ECU activates EFI relay coil via pin A2 (ground side)