Cummins ISB CM850 Wiring Diagram | ECM Pinout, Injectors, EGR System & J1939 Network (Bulletin 4021347)

Technical Highlights

• Full ECM pinout (CM850 module with multi-connectors)
• Common rail fuel system:
  • Electronic fuel control actuator
  • Rail pressure sensor
• Injector control:
  • Cylinders 1–6 driver circuits
• Advanced sensor network:
  • Engine speed & position sensors
  • Intake manifold pressure
  • Exhaust gas pressure
  • Barometric pressure
  • Coolant temperature
  • Turbocharger speed & position
• EGR system:
  • EGR valve motor
  • EGR differential pressure sensor
  • Exhaust gas temperature sensor
• Turbocharger system:
  • Variable geometry turbo actuator
  • Compressor inlet temperature sensor
• Communication:
  • J1939 engine datalink
  • J1587 datalink
• Actuators:
  • Fuel lift pump
  • Exhaust brake
• Diagnostic systems:
  • Stop lamp, warning lamp, wait-to-start
• Power distribution:
  • Battery supply, fuses, and returns

👉 The diagram on page 1 shows a full modern ECM layout integrating injectors, EGR, turbocharger, and sensor systems with detailed connector views and wiring paths.

Table of Content

• ECM Connector Layout (CM850)
• Injector Driver Circuits (1–6 Cylinders)
• Common Rail Fuel System Wiring
• Sensor Network (Pressure / Temperature / Speed)
• EGR System Wiring & Control
• Turbocharger Control & Sensors
• Data Link Communication (J1939 / J1587)
• Diagnostic Lamps & Signals
• Actuator Control (Fuel, Exhaust Brake)
• Power Supply & Ground Distribution

File Information

• Manufacturer: Cummins
• System: ISB CM850 Engine Management
• ECM Type: CM850
• Fuel System: Common Rail
• Document Type: Wiring Diagram
• Bulletin: 4021347-01
• Format: PDF
• Pages: 1
• Content: Electrical Schematics, Pinout, EGR & Turbo Systems