Reference: 2002–2005 Suzuki Alto Works / Wagon R Turbo. ECU part numbers: 33920-70Gxx / 33920-78Jxx.
| Pin | Connector | Wire Color | Signal Name | Description / Voltage | |-----|-----------|------------|----------------|------------------------| | Power & Ground ||||| | A1 | C1 | B/Y (Black/Yellow) | +12V Main Relay | Battery power via EFI relay | | A2 | C1 | B (Black) | Sensor Ground | ECU internal ground (sensors) | | A3 | C1 | B (Black) | Power Ground | High current ground (injectors, coils) | | A31 | C1 | B (Black) | Power Ground | Secondary high current ground | | B1 | C2 | B/R (Black/Red) | +12V Backup | Constant battery for keep-alive memory | | B2 | C2 | B/W (Black/White) | +12V Ignition Switch | Switched power (engine run/start) | | Sensors ||||| | A4 | C1 | Lg/R (Light Green/Red) | MAP Sensor Signal | 0.5–4.5V (idle to WOT) | | A5 | C1 | Lg/B (Light Green/Black) | IAT Sensor Signal | Intake air temp (thermistor) | | A6 | C1 | G/W (Green/White) | ECT Sensor Signal | Engine coolant temp | | A7 | C1 | Y (Yellow) | TPS Signal | Throttle position 0.5V idle → 4.5V WOT | | A8 | C1 | B (Black) | Sensor Ground | Common return for MAP, TPS, ECT | | A9 | C1 | R (Red) | +5V Sensor Reference | VREF for TPS, MAP, etc. | | A10 | C1 | B/Y (Black/Yellow) | CMP (Camshaft Sensor) | Hall effect, 1 pulse/2 crank revs | | A11 | C1 | B (Black) | CMP Ground | | | A12 | C1 | Y/R (Yellow/Red) | CKP (Crankshaft Sensor) | 24 teeth (missing 2) – 12V square wave | | A13 | C1 | B (Black) | CKP Ground | | | Ignition & Fuel ||||| | B4 | C2 | Y/G (Yellow/Green) | Injector Cyl 1 | Ground switching by ECU, ~12V peak | | B5 | C2 | Y (Yellow) | Injector Cyl 2 | | | B6 | C2 | Y/B (Yellow/Black) | Injector Cyl 3 | | | B7 | C2 | W (White) | IAC Valve (Stepper A) | Idle air control coil 1 | | B8 | C2 | W/B (White/Black) | IAC Valve (Stepper B) | Coil 2 | | B9 | C2 | W/R (White/Red) | IAC Valve (Stepper C) | Coil 3 | | B10 | C2 | W/G (White/Green) | IAC Valve (Stepper D) | Coil 4 | | B14 | C2 | B/R (Black/Red) | Ignition Output Coil 1+4 | Fires cylinders 1 & 4 (wasted spark) | | B15 | C2 | B/Y (Black/Yellow) | Ignition Output Coil 2+3 | Fires cylinders 2 & 3 | | Vehicle & Auxiliary ||||| | A15 | C1 | G (Green) | VSS (Vehicle Speed Sensor) | 4 pulses per revolution of speedo | | A18 | C1 | P (Purple) | Start Signal | 12V when cranking | | A22 | C1 | Lg (Light Green) | AC Switch Input | 12V = A/C request | | B20 | C2 | R (Red) | Check Engine Light | Ground output to dash lamp | | B22 | C2 | B/O (Black/Orange) | Fuel Pump Relay Control | Ground to activate fuel pump | | B24 | C2 | G/B (Green/Black) | Radiator Fan Relay | Ground output at ~98°C | | B30 | C2 | Y (Yellow) | Diagnostic Switch (DLC) | Grounding this pin enables diag mode | | B31 | C2 | W/B (White/Black) | Serial Data (K-Line) | ISO 9141-2 (older Suzuki protocol) |
The K6A ECU is typically housed in a metal box behind the glovebox or under the driver’s side dash. It uses two main connectors:
| Connector | Pins | Color | Function | |-----------|------|-------|-----------| | C1 (A) | 32 | Gray | Engine sensors, power grounds | | C2 (B) | 32 (or 24) | Black | Actuators, ignition, fuel, diagnostics |
Total common pins: 64 (32+32) or 56 (32+24) on earlier models.
Imagine looking at the harness plug as it plugs into the ECU.
Rows:
Columns: 1 through 16 (Left to Right)
| Pin | Wire Color | Function | Critical Notes | |------|------------|----------|----------------| | C01 | Shielded (Bare) | Crank Sensor Shield Ground | Do not ground externally. | | C02 | Black | Crankshaft Position (CKP) – Negative | VR sensor negative. | | C03 | White | Crankshaft Position (CKP) – Positive | VR sensor positive. Twist pair. | | C04 | Black/Green | CMP Sensor Power (5V) | Supplied from ECU. | | C05 | Blue/White | CMP Sensor Ground | Dedicated return. | | C06 | Yellow | CMP + Signal | Same as A18 – redundant on some ECUs. | | C07 | Red | Serial Data (K-Line) | Diagnostics (check engine scanner). | | C08 | Green | Injector Common 12V | From EFI relay. Ensure clean supply. | | C09-16 | Various | ABS, Speed limiter, Immobilizer | Rarely used in swaps. |
⚠️ High-quality verification: Always verify pin positions with a multimeter (continuity mode) before applying power. Wire colors may fade or be swapped on imported half-cuts.
The ECU has three plugs labeled A (18 pins, black), B (18 pins, gray), and C (34 pins, blue/white).
Using your high-quality pinout, follow this logical path:
| Symptom | Pin Check | Expected Reading | |---------|-----------|------------------| | No power to ECU | A03, A04 | 12V (key ON) | | No crank signal | C02, C03 (AC voltage) | >1.5V AC while cranking | | No injector pulse | A06 to ground (noid light) | Pulsing light | | No spark | A09, A10 (to igniter) | 5V square wave on oscilloscope |
Do not guess. Guessing burns ECUs.
| Pin | Wire Color | Function | Signal Type | Notes | |------|------------|----------|-------------|-------| | A01 | Black/White | ECU Ground (Power) | GND | Direct to battery negative. High current. | | A02 | Black/White | ECU Ground (Sensor) | GND | Clean ground for sensors. | | A03 | Red/Black | Battery +12V (Main) | Power | Constant 12V from EFI relay. | | A04 | Red | Battery +12V (Backup) | Power | Always live for memory (clock, trims). | | A05 | Green/Red | Ignition Switch ON | Switched 12V | Activates ECU main relay. | | A06 | Yellow/Black | Injector Cylinder 1 | Output | Sinks to ground. Use test light, not LED. | | A07 | Yellow/Red | Injector Cylinder 2 | Output | Peak/hold type (approx 12V). | | A08 | Yellow/Green | Injector Cylinder 3 | Output | Do not swap or engine runs rough. | | A09 | White | Ignition Output #1 (Power Transistor) | Digital | Controls coils 1 & 2 (lost spark). | | A10 | White/Black | Ignition Output #2 (Power Transistor) | Digital | Controls coil 3 (wasted spark). | | A11 | Blue/White | Fuel Pump Relay Control | Output | Grounds relay when engine cranks/runs. | | A12 | Green/Yellow | Check Engine Light (MIL) | Output | Switched ground to dash light. | | A13 | Brown | EGR Vacuum Solenoid (if equipped) | Output | Not all K6A have EGR. | | A14 | Blue | Boost Control Solenoid (Turbo) | PWM Output | Controls wastegate duty cycle. | | A15 | Empty | N/A | - | Not used in this revision. | | A16 | Black/Yellow | Idle Air Control (IAC) – Close | PWM | Stepper motor wire A. | | A17 | Black/Blue | Idle Air Control (IAC) – Open | PWM | Stepper motor wire B. | | A18 | White/Red | Camshaft Position Sensor (CMP) Signal | Digital (5V) | Hall effect sensor. Shielded pair. | | A19 | Red/Blue | Engine Coolant Temp (ECT) Signal | Analog (0-5V) | 2.5V at warm, 4.5V cold. | | A20 | Green/White | Throttle Position Sensor (TPS) Signal | Analog (0-5V) | 0.4V idle, 4.2V WOT. | | A21 | Pink | Manifold Absolute Pressure (MAP) | Analog (0-5V) | 1.5V idle, 4.0V boost. | | A22 | Gray/Red | Intake Air Temp (IAT) | Analog (0-5V) | In MAF or manifold. | | A23 | Black/Red | Oxygen Sensor (O2) Signal | Narrowband (0-1V) | 0.1V lean, 0.9V rich. | | A24 | Pink/Black | Knock Sensor Signal | Analog AC | Sensitive to RF noise. | | A25 | Empty | N/A | - | - | | A26 | Black/Yellow | Sensor Ground (Return) | GND | Shared ground for TPS, ECT, MAP. |
Disclaimer: This pinout is compiled from reverse engineering and official Suzuki documentation for pre-2006 Kei vehicles. Always validate on your specific chassis. Incorrect wiring can damage the ECU or engine.
Would you like a downloadable PDF pinout card or a pinout for a specific K6A variant (Jimny JB23 / Alto HA24)?
Suzuki K6A engine uses several ECU configurations depending on the vehicle model (Jimny, Alto, Carry, or Wagon R) and whether it is naturally aspirated or turbocharged. High-quality pinouts typically distinguish between common 2-plug (22-pin + 26-pin or 26-pin + 34-pin) and newer 3-plug or 4-plug Denso systems. Common 60-Pin + 34-Pin Configuration (Denso)
This arrangement is frequent in later model K6A engines. Below are key terminal assignments for the primary connectors: Connector C37 (60-Pin) Pin 1 (PNK): Fuel Injector No. 1 Pin 2 (PNK/BLK): Fuel Injector No. 2 Pin 31 (BLK/YEL): Ground for A/F Sensor Heater Pin 32 (PNK/BLU): Heater output of A/F Sensor Pin 35 (RED/YEL): Crankshaft Position (CKP) Sensor (–) Pin 40 (RED): Throttle Position Sensor (TPS) signal Pin 41 (GRN): Ground for Throttle Position Sensor Connector E23 (34-Pin) Pin 4 (WHT/RED): CAN-High communication line (for ABS/Control modules) Pin 5 (PPL/WHT): 12V Serial Communication (Data Link Connector) Universal 16-Pin + 8-Pin Wiring (Retrofit/Aftermarket)
For custom installations, such as putting a K6A into a Suzuki Mehran or small truck, standard conversion looms often use these color-coded assignments: Switching power supply (+12V) Negative power supply (GND) Water temperature signal Yellow/Brown/White: Switch signals (various) Purple/Black: Original car ECU signal interface High-Quality Technical Resources suzuki k6a engine ecu pinout high quality
For detailed diagrams including wire colors and specific voltage values for troubleshooting, you can access the following official and community-verified documents: Full Workshop Manual: Suzuki K6A-YH6 Repair Manual
includes complete electrical schematics for the engine management system. Detailed Pinout Guide: Suzuki ECU Pinout and Wiring Diagrams
on Scribd provides a terminal-by-terminal breakdown for the 94-pin setup. Overhaul Support: For mechanical and electrical integration, the K6A Engine Overhaul Manual covers specifications for Wagon R and Cappuccino models. 84.22.143.158 Are you working on a standard engine swap or troubleshooting a specific sensor issue on a Jimny or Alto?
What is K6A Engine? The 0.6-liter 3-cylinder Suzuki K6A ... - Facebook
The Suzuki K6A is a staple of the Japanese Kei car market, powering popular models like the Jimny, Carry, Alto, and Wagon R. Mapping its Engine Control Unit (ECU) pinout is essential for engine swaps, aftermarket tuning, or deep electrical troubleshooting.
Because K6A ECU configurations vary across generations and models, this guide focuses on the most common Denso 33920 series and general K6A wiring standards. K6A ECU Connector Overview
Most K6A ECUs utilize a multi-connector system, often referred to by their pin counts (e.g., a 60-pin C37 connector and a 34-pin E23 connector).
Connector C37 (Main Control): Typically handles core engine functions like fuel injectors and ignition coils.
Connector E23 (Sensors/Peripherals): Manages input from sensors like the MAP and TPS, as well as communication lines like CAN-High/Low. Essential Pinout Functions & Wire Colors
Below are the critical pin assignments found across high-quality K6A wiring diagrams. Pin Function Common Wire Color Typical Connector/Pin Fuel Injector No. 1 Pink (PNK) C37 - Pin 1 Fuel Injector No. 2 Pink/Black (PNK/BLK) C37 - Pin 2 Ignition Coil Signal Brown (BRN) Sensor Connector Main Power (+12V) Red/Black (RED/BLK) Battery Input ECU Ground Black (BLK) Ground Terminals MAP Sensor Signal Purple (PPL) E23 - Pin 34 TPS Sensor Signal Green (GRN) E23 - Pin 8 Coolant Temp (ECT) Blue (BLU) E23 - Pin 33 CAN-High Yellow/Green (YEL/GRN) Communication Line CAN-Low Gray/Yellow (GRY/YEL) Communication Line Critical Sensor Wiring Details
For accurate tuning or troubleshooting, ensure these specific sensors are wired according to factory twisted-pair standards to reduce electrical noise:
Air Temperature Sensor: Uses a white/black twisted pair. White is the signal (Pin 16), and Black is the sensor ground (Pin 30).
Coolant Temperature Sensor: Uses a blue/black twisted pair. Blue is the signal (Pin 33), and Black is the sensor ground (Pin 30).
MAP Sensor: Often a red/purple/black configuration. Red is +5V supply (Pin 9), Purple is the signal (Pin 34), and Black is ground (Pin 30). Troubleshooting Tips Wiring diagram for 1998 Wagon R K6A engine?
The Suzuki K6A engine is a 0.6-liter, 3-cylinder unit used extensively in Japanese compact cars like the Suzuki Alto, Wagon R, and Jimny. Because this engine was produced for over two decades (1994–2018), ECU pinouts can vary significantly between naturally aspirated and turbocharged versions, as well as between different vehicle models like the Suzuki Carry. Typical ECU Connector Layout
Modern K6A ECUs often utilize a multi-connector setup, commonly consisting of a 60-terminal connector (often labeled C37) and a 34-terminal connector (often labeled E23). Key ECU Terminal Functions
While specific pin numbers vary by year, standard K6A wiring diagrams typically include the following critical circuits:
Fuel System: Pins for Fuel Injectors No. 1, 2, and 3, plus the fuel pump relay.
Ignition: Dedicated terminals for Ignition Coils (IT1, IT2, IT3) and the ignition key signal. Reference: 2002–2005 Suzuki Alto Works / Wagon R Turbo
Sensors: Inputs for the Camshaft Position Sensor (CMP), Crankshaft Position Sensor (CKP), Manifold Absolute Pressure (MAP) sensor, and Throttle Position Sensor (TPS).
Environmental/Emissions: Oxygen sensor signals, Engine Coolant Temperature (ECT) sensor, and Intake Air Temperature (IAT) sensor.
Power & Ground: Battery +12V, ignition-switched power, and multiple chassis/sensor grounds. Essential Wire Color Codes
For identification during troubleshooting or aftermarket ECU installation, refer to these common Suzuki K6A wire colors: Black (B): Standard Ground Red (R): Main Power/Battery Yellow (Y): Sensor Power or Specific Signal
Brown (BR): Injector Signals (e.g., BR/B for Injector 1, BR/W for Injector 3)
Green (G): Often used for CAN-HIGH or specific control signals Purple (P): Oxygen sensor or specialized sensor signals Troubleshooting & Resources
For detailed diagrams matching your specific VIN or engine code, use these authoritative technical sources:
Service Manuals: The Suzuki K6A Technical/Repair Manual provides factory-approved troubleshooting and terminal arrangements.
Wiring Repositories: Detailed pinout PDFs are often hosted on platforms like Scribd - Suzuki ECU Pinouts, which list all 60 terminals for specific K6A variants.
Speeduino Wiki: For those using aftermarket engine management, the Speeduino K6A Decoder guide explains trigger patterns (6+1 teeth) and sensor spacing.
Caution: Always disconnect the negative battery terminal before testing ECU pins to prevent short-circuiting sensitive internal components. g., Jimny vs. Carry) or an aftermarket ECU swap? ECU Wiring Diagram for Suzuki K6A | PDF - Scribd
The Suzuki K6A engine is a legendary 660cc three-cylinder powerhouse, famous for its role in Japan’s "Kei car" culture. Whether you are swapping a K6A into a custom buggy, reviving a Suzuki Jimny, or troubleshooting a Carry truck, having a high-quality ECU pinout is the difference between a smooth-running engine and a fried wiring harness.
This guide provides a comprehensive breakdown of the Suzuki K6A ECU pinouts, focusing on the most common versions found in the Jimny (JB23), Carry (DA63T), and Wagon R. Understanding K6A ECU Variations
Before you start pinning, you must identify your specific K6A generation. Unlike older engines, the K6A evolved through several fuel injection and ignition systems: Early K6A (Distributor Type): Found in early 90s models.
K6A VVT (Variable Valve Timing): Features a 3-plug or 4-plug ECU.
K6A Turbo: Includes additional pins for the wastegate solenoid and boost sensors. High-Quality Pinout Reference (Common 3-Plug Configuration)
Most modern K6A swaps utilize the 26-pin / 34-pin / 22-pin connector configuration. Below is a high-level map of the essential pins needed to get the engine running in a standalone or swap environment. 1. Power and Ground (The Essentials)
To wake up the ECU, these pins must be connected correctly to your battery and ignition switch. +12V Permanent (BATT): Constant power for ECU memory. +12V Switched (IGN): Power from the ignition switch.
Main Relay Control: The ECU triggers the main relay to power the injectors and coils. The K6A ECU is typically housed in a
Engine Ground (GND): 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)
For the K6A to calculate fuel and timing, it needs clean signals from these pins:
Crankshaft Position Sensor (CKP): The heartbeat of the engine.
Camshaft Position Sensor (CMP): Essential for VVT and sequential injection. Manifold Absolute Pressure (MAP): Measures vacuum/boost.
Engine Coolant Temp (ECT): Adjusts fueling based on engine warmth.
Throttle Position Sensor (TPS): Tells the ECU how much air you’re demanding. 3. Actuator Outputs (The "Muscle")
Injector 1, 2, 3: Ground-side switching for the fuel injectors.
Ignition Coils (IG1, IG2, IG3): Triggers for the coil-on-plug units.
ISC (Idle Speed Control): Manages the air bypass for a steady idle.
VVT Solenoid: (If equipped) Controls oil flow to the cam phaser. Pro-Tips for a High-Quality Installation Use Shielded Wiring
The Crank and Cam sensor signals are incredibly sensitive to electrical "noise." If you are extending these wires for a swap, use shielded twisted-pair wiring to prevent the engine from misfiring or cutting out at high RPMs. The "Check Engine" Light Trick
Even if you aren't using a dashboard, wire a small LED to the MIL (Malfunction Indicator Lamp) pin. In the K6A ECU, this pin usually switches to ground to turn the light on. This allows you to read "blink codes" if the engine refuses to start. Grounding is King
90% of K6A wiring issues stem from poor grounds. Ensure the ECU ground pins are all connected to a single "star point" on the engine block to avoid ground loops that can skew sensor readings. Identifying Your Specific Pinout
Because Suzuki updated their wire colors and pin locations almost yearly, the best way to verify your pinout is to:
Check the ECU Case: Look for the part number (e.g., 33920-XXXXX).
Verify Plug Shape: Are you working with a gray/white plug or a yellow plug?
Back-Probe: Use a multimeter to verify ground and 12V pins before connecting the sensors to avoid accidental damage. Summary of Wire Colors (Standard Suzuki) Black/White: Usually Ignition 12V+ Black: Usually Ground Blue/Black: Often used for the Fuel Pump Relay trigger Yellow/Blue: Frequently used for the Tachometer signal
Are you currently working on a K6A engine swap or trying to diagnose a specific wiring fault on a stock vehicle?