If you are using a PDF diagram like those found in or, follow these steps:

Never rely solely on wire color. Suzuki frequently changed wire insulation stripes mid-generation. Test your +B and Ground pins with a digital multimeter before plugging in the ECU.

Multiple pins (usually thick black or black/white wires) that must be grounded to the chassis or engine block. 2. Sensor Inputs (The "Brain" Feed)

: Essential for timing; the K6A often uses a 6+1 tooth pattern on the camshaft for phase detection. MAP/Vacuum Pressure : Usually identified by Red/Yellow (signal) and (+12V/GND) wiring. Engine Coolant Temperature (ECT) : Typically found on an Orange/White Oxygen Sensors : Signal wires are often (Sensor 1) and Gray/Black (Sensor 2). Actuator & Power Terminals Fuel Injectors

Before you start pinning, you must identify your specific K6A generation. Unlike older engines, the K6A evolved through several fuel injection and ignition systems: Found in early 90s models.

Suzuki manufactured the K6A engine from 1994 through 2018. Over this 24-year production run, the electronics evolved significantly. You must identify your specific engine variant before pinning out your harness:

Measure voltage between Pin B2 (Ignition 12V) and Engine Ground with the key ON. It must read battery voltage (approx. 12.6V).

Route the ECU's Fuel Pump Control pin to trigger a standard automotive relay.

The K6A is a 658cc inline-3 cylinder engine found in kei cars like the . However, Suzuki used multiple ECU families (Denso, Mitsubishi, and Hitachi). This guide covers the most common pinout—the Denso 34-pin + 18-pin configuration (3-plug ECU) from the OBD-I era (~1998–2005).

Found in mid-2000s and later vehicles. Features highly complex electronic throttle controls and OBD2 diagnostics.

Signal from the exhaust manifold to manage closed-loop fueling. Actuators and Outputs