Technical Highlights
- Full ECM pinout (CM850 multi-connector architecture)
- Injector control:
- Driver circuits for cylinders 1–6
- Injector pass-through connector mapping
- Sensor network:
- Intake manifold pressure & temperature
- Fuel rail pressure sensor
- Barometric pressure sensor
- Engine coolant temperature
- Oil pressure switch & temperature
- Water-in-fuel sensor
- Aftertreatment system:
- Catalyst solution (DEF) tank heater
- DEF level & temperature sensor
- Exhaust gas temperature sensors (EGT 1 & 2)
- Dosing control unit interface
- Control systems:
- Accelerator pedal assemblies
- Cruise control & PTO switches
- Engine brake control
- Communication:
- SAE J1939 data link
- SAE J1587 data link
- Diagnostic systems:
- Malfunction indicator lamp
- Red stop lamp
- Amber warning lamp
- Wait-to-start lamp
- Actuators:
- Intake air heater relay
- Fan clutch
- Air solenoid
- Power distribution:
- Battery supply, ignition, relays, and fuse protection
👉 The diagram on page 1 clearly shows injector driver circuits, aftertreatment interface connectors, and detailed sensor wiring, along with connector mating faces for all major components.
Table of Content
- ECM Connector Layout (CM850)
- Injector Driver Circuits (1–6 Cylinders)
- Common Rail Fuel System Wiring
- Sensor Network (Pressure / Temperature / Position)
- Aftertreatment System (DEF Tank, EGT Sensors)
- Accelerator & Control Systems
- Diagnostic Lamps & Indicators
- Data Link Communication (J1939 / J1587)
- Actuator Control Systems
- Power Supply & Ground Distribution
File Information
- Manufacturer: Cummins
- System: ISBe4 CM850 Engine Management
- ECM Type: CM850
- Fuel System: Common Rail
- Aftertreatment: DEF / Catalyst System
- Document Type: Wiring Diagram
- Bulletin: 4021532
- Format: PDF
- Pages: 1
- Content: Electrical Schematics, Pinout, Injector & Aftertreatment Systems
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