Technical Highlights
- Full ECM pinout (CM850 multi-connector architecture)
- Injector control:
- Driver circuits for cylinders 1–6
- Injector pass-through connector mapping
- Fuel system:
- Rail fuel pressure sensor
- Fuel pump actuator
- Fuel lift pump
- Sensor network:
- Crankshaft speed sensor
- Camshaft position sensor
- Intake manifold pressure
- Intake air temperature
- Turbocharger compressor inlet temperature
- Engine coolant temperature
- Engine oil pressure sensor
- Barometric pressure sensor
- Turbocharger system:
- Turbocharger speed sensor
- Turbocharger control valve
- Communication:
- SAE J1939 data link
- SAE J1587 data link
- Control systems:
- Accelerator pedal assembly
- PTO & cruise control switches
- Engine brake control
- Torque limit & protection switches
- Diagnostic systems:
- Red stop lamp
- Amber warning lamp
- Wait-to-start lamp
- Actuators:
- Intake air heater relay
- Fan clutch
- Exhaust brake solenoids
- Power distribution:
- Battery supply & ground circuits
- Fuse-protected lines
- ECM power supply
👉 The diagram on page 1 clearly shows injector driver mapping, turbocharger system wiring, and full ECM connector layout, along with detailed connector mating faces for sensors and actuators.
Table of Content
- ECM Connector Layout (CM850)
- Injector Driver Circuits (1–6 Cylinders)
- Common Rail Fuel System Wiring
- Sensor Network (Pressure / Temperature / Position)
- Turbocharger System (Speed Sensor & Control Valve)
- Accelerator & Control Systems
- Diagnostic Lamps & Indicators
- Data Link Communication (J1939 / J1587)
- Actuator Control Systems
- Power Supply & Ground Distribution
File Information
- Manufacturer: Cummins
- Engine Models: ISC / ISL
- ECM Type: CM850
- Fuel System: Common Rail
- Document Type: Wiring Diagram
- Bulletin: 4021421 Rev 0
- Format: PDF
- Pages: 1
- Content: Electrical Schematics, Pinout, Injector, Turbo & Sensor Systems
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