Cummins ISF3.8 CM2220 Wiring Diagram (Without SCR) | ECM Pinout, Sensors & J1939 Network (4021685)

Technical Highlights

• Full ECM pinout and signal mapping
• Simplified architecture without SCR/DEF system
• Color-coded wiring for voltage, signal, return, and CAN lines
• Injector solenoid driver circuits fully mapped
• J1939 CAN bus with termination and diagnostic interface
• Battery, ignition, and fuse-protected circuits
• OEM vs Cummins responsibility separation

Table of Content

• Wiring Diagram Overview
  • Signal Legend and Color Codes
  • Wiring Symbols and Pin Identification
• Power Distribution
  • Battery Supply
  • Ignition Input
  • Fuse Protection
• Engine Control Module (ECM)
  • ECM Overview
  • Engine Harness Connector
  • OEM Harness Connector
• Engine Sensors
  • Crankshaft Position Sensor
  • Camshaft Position Sensor
  • Fuel Rail Pressure Sensor
  • Intake Manifold Pressure / Temperature Sensor
  • Barometric Pressure Sensor
  • Coolant Temperature Sensor
  • Water in Fuel Sensor
  • Oil Pressure Switch
• Fuel System
  • Fuel Pump Actuator
  • Injector Circuits (1–4)
• Vehicle Interface (OEM Side)
  • Accelerator Pedal Systems
  • Cruise Control Switches
  • Brake and Clutch Switches
• Communication Network
  • SAE J1939 Data Link
  • CAN Bus Termination
• Diagnostics
  • Service Tool Connector
  • 9-Pin Deutsch Connector
• Instrumentation & Outputs
  • Tachometer
  • Warning Lamps (MIL, Stop, Warning)
  • Grid Heater
  • Starter Lockout

File Information

• Manufacturer: Cummins Inc.
• Engine Model: ISF3.8
• ECM Type: CM2220
• Variant: Without SCR
• Document Type: Wiring Diagram
• Bulletin Number: 4021685
• Language: English
• Format: PDF
• Pages: 1 (large-format schematic)

Compatible Applications

• Cummins ISF3.8 engines without SCR systems
• Light and medium-duty commercial vehicles
• Industrial and mechanical applications without DEF