The ECU has three plugs labeled A (18 pins, black), B (18 pins, gray), and C (34 pins, blue/white).
If replacing with Haltech, Link, MaxxECU, or MegaSquirt:
| Connector | Pin Count | Color Code (Typical) | |-----------|-----------|----------------------| | A | 32 | Gray | | B | 32 | Black | | C (OBD) | 22 | Blue (some models) |
Note: Not all pins are populated on all vehicle models (e.g., Wagon R, Alto, Jimny, Carry).
| Pin | Wire Color | Function | Notes | |-----|------------|----------|-------| | A-1 | B (Black) | Power ground (ECU) | Must go to engine block/battery negative | | A-2 | B/Y (Black/Yellow) | Sensor ground (analog) | Common return for TPS, MAP, ECT, IAT | | A-3 | R (Red) | Main relay coil control | ECU grounds this to energize main relay | | A-4 | – | (NC) | – | | A-5 | B/R (Black/Red) | Power ground (ignition/injector stage) | High-current ground | | A-6 | B (Black) | Power ground (ECU) | Secondary ground | | A-7 | W (White) | IG power (switched +12V) | From ignition switch (engine running/crank) | | A-8 | Y (Yellow) | Backup power (+12V constant) | Direct to battery (keeps KAM alive) | | A-9 | Lg/R (Light Green/Red) | Injector cylinder #3 | Saturated driver (12V when off, ECU grounds) | | A-10 | Lg/B (Light Green/Black) | Injector cylinder #2 | – | | A-11 | Lg (Light Green) | Injector cylinder #1 | – | | A-12 | B/W (Black/White) | Fuel pump relay control | ECU grounds to prime/run pump | | A-13 | B/W (Black/White) | Ignition coil #1 (cyl 1 & 2 wasted spark) | Direct IGBT driver | | A-14 | B/R (Black/Red) | Ignition coil #2 (cyl 3) | Wasted spark paired with cylinder 2? Verify per year | | A-15 | R/W (Red/White) | Tachometer output | 12V square wave, 2 pulses per rev | | A-16 | – | (NC or AT signal) | – | | A-17 | – | (NC) | – | | A-18 | P (Purple) | Check engine light (MIL) | ECU grounds to illuminate | suzuki k6a engine ecu pinout high quality
| Pin | Signal Name | I/O | Type | Notes | |-----|---------------------------|------|---------------|--------------------------------| | A1 | Injector #1 | Out | Low-side drive| 12V when off, pulsed ground | | A2 | Injector #2 | Out | Low-side drive| | | A3 | Injector #3 | Out | Low-side drive| | | A4 | Fuel pump relay | Out | Ground switch | On during cranking/running | | A5 | Tachometer output | Out | 0-12V square | 4 pulses per engine revolution | | A6 | MIL (Check Engine Light) | Out | Ground switch | Active low | | A7 | Cooling fan relay 1 | Out | Ground switch | Low speed | | A8 | Cooling fan relay 2 | Out | Ground switch | High speed | | A9 | EGR solenoid (if equipped)| Out | PWM ground | Not on all markets | | A10 | A/C compressor relay | Out | Ground switch | | | A11 | VVT oil control valve | Out | PWM (80-200Hz)| On K6A with VVT (late models) | | A12 | Idle Air Control (IAC) – | Out | PWM stepper | 4-wire stepper motor | | A13 | IAC Coil 2 | Out | | | | A14 | IAC Coil 3 | Out | | | | A15 | IAC Coil 4 | Out | | | | A16 | +12V Battery (constant) | Power| | From EFI main relay | | A17 | Injector common +12V | Power| | From fuel pump relay | | A18 | Ignition coil #1 – trigger| Out | 5V logic | To igniter (if external) | | A19 | Ignition coil #2 – trigger| Out | 5V logic | | | A20 | Ignition coil #3 – trigger| Out | 5V logic | | | A21 | Wastegate solenoid (turbo)| Out | PWM ground | Max 10Hz (boost control) | | A22 | Purge control solenoid | Out | PWM ground | Evaporative emissions | | A23 | Sensor ground | GND | Analog return| 0V reference | | A24 | Power ground 1 | GND | High current | To engine block | | A25 | Power ground 2 | GND | High current | | | A26 | O2 sensor heater (front) | Out | PWM ground | Heated oxygen sensor | | A27 | O2 sensor heater (rear) | Out | PWM ground | If dual sensor | | A28 | MAF sensor +5V reference | Out | +5V | To MAF pin 3 | | A29 | TPS +5V reference | Out | +5V | Throttle position sensor | | A30 | Cam position signal (CMP) | In | Hall effect | 0-5V digital | | A31 | Crank position (CKP) + | In | Magnetic | High resolution | | A32 | Crank position (CKP) – | In | Magnetic | |
Before we dive into pins and voltages, let’s address a common pitfall. Scouring the internet for a K6A pinout often yields blurry scans, translated errors, or generic diagrams labeled “Suzuki 3-cyl.”
Low-quality pinouts cause:
A high-quality ECU pinout must include:
This article provides precisely that level of detail.
The Suzuki K6A engine is a legend in the kei-car world. Found under the hood of the Suzuki Cappuccino, Alto Works, and the cult-classic Autozam AZ-1, this 660cc powerhouse is the heart of Japan's most exciting micro-cars.
Whether you are swapping this engine into a classic Mini, a beach buggy, or repairing a vintage JDM import, accessing a high-quality ECU pinout is often the most frustrating step. Low-resolution scans from 1990s service manuals circulate the internet, often missing critical context.
This feature provides a clear, high-quality reference for the Suzuki K6A ECU pinout, focusing on the most common MPFI (Multi-Point Fuel Injection) configuration found in the Cappuccino and AZ-1. The ECU has three plugs labeled A (18
The K6A uses several ECU generations, but the most common are:
Pinouts vary slightly between the Wagon R (MC22S) , Alto Works (HA11S) , and Cappuccino (EA11R) . However, the core 64-pin or 72-pin connector architecture is largely consistent. We will focus on the 64-pin Denso ECU, which is the most widely swapped and tuned variant.
ECU connectors are typically labeled E01, E02, E03 (or A, B, C). Each houses between 20 and 28 pins.