- Specification
- Description
- Compatibility
| Brand | Maruti Suzuki (Genuine OEM) |
| Product Type | ECM / ECU / Engine Control Module |
| Part Number | 33920M78LM2 BR / 33920-78LM2 |
| Manufacturer | Denso India |
| Also Known As | Engine Control Unit, Engine Controller, PCM |
| Function | Complete Engine Management & Control |
| Voltage | 12V DC (Vehicle Standard) |
| Connector Type | Multi-Pin (Denso Standard Connector) |
| Material | Aluminum Housing + PCB Circuit Board |
| Condition | 100% Genuine OEM - Brand New |
| Origin | Made in India |
| Programming | Pre-Programmed / Requires VIN Matching |
| Warranty | 6 Months Manufacturer Warranty |
| Shipping | DHL, FedEx, Aramex Worldwide |
Product Description
This is a genuine OEM Maruti Suzuki ECM (Engine Control Module) also known as ECU (Engine Control Unit) with part number 33920M78LM2 BR / 33920-78LM2. Manufactured by Denso India, this is the central electronic control unit responsible for managing all engine-related functions in compatible Maruti Suzuki vehicles.
What is an ECM/ECU?
The Engine Control Module (ECM) or Engine Control Unit (ECU) is the "brain" of your vehicle's engine. It monitors and controls various engine parameters including fuel injection, ignition timing, idle speed, emission controls, and more. Without a properly functioning ECM, the engine cannot start or run efficiently.
Key Features:
- ✅ Genuine OEM Part – Direct from Maruti Suzuki / Denso factory
- ✅ Denso India – Premium automotive electronics manufacturer
- ✅ Complete Engine Management – Fuel, ignition, emission control
- ✅ Pre-Programmed – Ready for installation with VIN matching
- ✅ Aluminum Housing – Superior heat dissipation
- ✅ Made in India – Original manufacturing quality
- ✅ Exact Replacement – Matches original factory specifications
Functions Controlled by ECM Module:
- ⛽ Fuel Injection – Controls fuel injectors timing and duration
- ⚡ Ignition Timing – Manages spark plug firing sequence
- 🔄 Idle Speed Control – Maintains stable engine idle RPM
- 📊 Emission Control – Manages EGR, EVAP, catalytic converter
- 🌡️ Cooling System – Controls radiator fan operation
- 🔍 Sensor Monitoring – Reads O2, MAP, TPS, CKP sensors
- 🚨 Check Engine Light – Stores and reports diagnostic trouble codes
- 📡 CAN Bus Communication – Vehicle network integration
Common Symptoms of Faulty ECM:
- ⚠️ Engine cranks but fails to start
- ⚠️ Engine stalling or rough idle
- ⚠️ Poor fuel economy
- ⚠️ Check Engine Light (CEL) illuminated
- ⚠️ Loss of power during acceleration
- ⚠️ Transmission shifting issues
- ⚠️ Engine misfire or hesitation
- ⚠️ OBD-II scanner cannot communicate with ECU
Programming Requirements:
This ECM is pre-programmed from factory but may require VIN matching and immobilizer programming for your specific vehicle. Professional installation by an authorized Maruti Suzuki dealer or certified automotive electrician is strongly recommended. Incorrect programming may result in engine non-start or damage.
Package Includes:
- 1 x ECM Engine Control Module (33920M78LM2 BR)
- 1 x Mounting Bracket (if applicable)
- 1 x Installation Instructions
⚠️ Important Note: Professional installation and programming mandatory. Verify part number compatibility with your vehicle VIN before purchase. ECM is a critical electronic component — always use genuine parts to ensure engine performance and reliability.
Vehicle Compatibility
This ECM Engine Control Module is compatible with the following Maruti Suzuki models:
| Model | Year Range | Engine | Notes |
|---|---|---|---|
| Maruti Suzuki Eeco | 2010 – 2024 | 1.2L G12B Petrol | Primary Application |
| Maruti Suzuki Eeco | 2010 – 2024 | 1.2L G12B CNG | CNG Variant |
| Maruti Suzuki Eeco Cargo | 2010 – 2024 | 1.2L G12B Petrol | Commercial Variant |
| Maruti Suzuki Omni | 2008 – 2019 | 0.8L F8D Petrol | Verify Part Number |
⚠️ Verification Required: This ECM is primarily designed for Maruti Suzuki Eeco models. Please confirm your existing part number (33920M78LM2 BR) matches before ordering. Cross-reference with your vehicle VIN at an authorized dealer. Programming is mandatory and must be done by a certified technician.
⚠️ Programming Note: ECM replacement requires immobilizer programming and VIN coding. Always consult a professional with Maruti Suzuki diagnostic equipment (SDT / GDS).