Cummins Gas Plus Engine Wiring Diagram | ECM Pinout, Sensors, Ignition & Fuel Control System (Bulletin 4021276)

Technical Highlights

• Full ECM pinout (31-pin OEM + 50-pin engine connectors)
• Gas engine-specific systems:
  • Fuel control valve
  • Gas mass flow sensor
  • Wastegate control
  • Fuel shutoff (natural gas / propane variants)
• Ignition system integration:
  • Ignition control module signals
  • Knock sensors (front & rear)
• Sensor coverage:
  • Oil pressure & temperature
  • Coolant temperature & level
  • Fuel pressure & temperature
  • Intake manifold pressure & temperature
  • Exhaust back pressure
• Heated oxygen sensor system (calibration, heater, reference)
• J1939 & J1587 communication data links
• Diagnostic outputs:
  • Stop engine lamp
  • Check engine lamp
• Power distribution and fuse protection circuits

👉 The main diagram on page 1 shows a complex ECM-centered architecture linking ignition, fuel, and sensor systems with full connector mapping and signal routing.

Table of Content

• ECM Connector Layout (31-Pin / 50-Pin)
• Fuel System Control Circuits
• Ignition Control Module Wiring
• Sensor Network (Pressure / Temperature / Flow)
• Heated Oxygen Sensor System
• Knock Sensor Circuits
• Data Link Communication (J1939 / J1587)
• Diagnostic Lamps & Signals
• Power Supply & Ground Distribution

File Information

• Manufacturer: Cummins
• System: Gas Plus Engine Management
• Document Type: Wiring Diagram
• Bulletin: 4021276-01
• ECM Part Number: 3937299
• Format: PDF
• Pages: 1
• Content: Electrical Schematics, Pinout, Gas Engine Systems