Suzuki K6a Engine Ecu Pinout Review
The Cappuccino uses a unique pin at A11 for the "Top Switch" (a manual override for the retracting hardtop interlock). If you are swapping a Cappuccino engine into a Jimny, leave this pin floating.
| Pin No. | Function | Description | | :--- | :--- | :--- | | A1 | Battery Constant 12V | Main Power Source (Fused) | | A2 | ECU Ground | Ground (Chassis/Block) | | A3 | Ignition Switch 12V | Power when key is ON/START | | A4 | Fuel Pump Relay | Output to trigger fuel pump | | A5 | Check Engine Light | Output to Instrument Cluster | | A6 | Main Relay | Output to trigger Main/FI Relay |
| Pin | Signal | Wire Color | Notes | | :--- | :--- | :--- | :--- | | A1 | Backup Power (Batt +12V) | White/Red | Constant 12V for ECU memory | | A2 | Main Power (Switched +12V) | Black/White | From main relay | | A3 | Sensor Ground | Black/Red | Common for TPS, MAP, ECT | | A4 | Power Ground | Black/Yellow | To engine block | | A5 | Power Ground | Black/Yellow | | | A6 | Throttle Position Sensor (TPS) Signal | Light Green | 0.5V (idle) to 4.5V (WOT) | | A7 | Manifold Absolute Pressure (MAP) | Light Green/Red | Frequency based (Turbo models) | | A8 | Intake Air Temp (IAT) | Green/White | 2.2kΩ cold / 300Ω hot | | A15 | Camshaft Position (CMP) | Yellow/Red | Hall effect sensor | | A16 | Crankshaft Position (CKP) | Blue/Red | 24 tooth crank wheel | | A21 | Engine Coolant Temp (ECT) | Yellow/Blue | | | A22 | Knock Sensor | Shielded | Connects to ECU logic ground | | A24 | Oxygen Sensor (Primary) | White | 0-1V Zirconia | | A30 | Ignition Switch (ST) | Black/White | Start signal input | | A31 | Main Relay Control | Blue/Yellow | ECU grounds to turn on relay | suzuki k6a engine ecu pinout
The Suzuki K6A engine utilized several different ECU generations. When searching for pinouts, the year and model of the donor vehicle are the primary determinants.
Note on Physical Identification: The ECU is typically located under the dashboard on the passenger side (RHD vehicles) or driver side (LHD conversions). The ECU label often carries a part number (e.g., 33920-xxxxx). Using this number is the most accurate way to source a specific wiring diagram. The Cappuccino uses a unique pin at A11
Check: Pin A1 (Battery) and Pin A2 (Switched). Fix: The main relay (controlled by Pin A31) often fails. Jump pins A31 to ground momentarily to test relay health.
| Pin | Signal | Description | |------|----------------|----------------------------------| | C1 | ISC solenoid | Idle speed control (if separate from IAC) | | C2 | CLT gauge output | Coolant temp gauge to dash | | C3 | Tachometer output | RPM signal for cluster | | C4 | K-line (ISO 9141) | Diagnostics (OBD) – K line | | C5 | L-line | Diagnostics (rarely used) | | C6 | Serial data (OBD2) | J1850 or CAN (late models) | | C7 | Torque converter clutch (auto) | TCC solenoid control | | C8 | Trans shift solenoid A | Auto transmission | | C9 | Trans shift solenoid B | Auto transmission | Note on Physical Identification: The ECU is typically
The K6A automatic ECU adds pins for the torque converter lockup and shift solenoids. If you plug an automatic ECU into a manual car (or vice versa), you will get a permanent check engine light and odd idle behavior. The pinout above is strictly manual transmission.