Cummins ISC CM554 Wiring Diagram | ECM Pinout, CAPS Fuel System, Sensors & J1939 J1587 Network

Technical Highlights

• Full ECM pinout (Connector A – Engine / Connector B – OEM)
• ECM type:
  • CM554 (CAPS system architecture)
• Fuel system:
  • CAPS fuel pump
  • Accumulator pressure system
  • Injection control valve
  • Lift pump
• Sensor network:
  • Engine speed (ESS)
  • Engine position (EPS)
  • Boost pressure sensor
  • Ambient air pressure
  • Coolant temperature
  • Intake air temperature
• Control systems:
  • Accelerator pedal (ISS / non-ISS + remote throttle)
  • Cruise control & PTO switches
  • Torque limit & axle ratio switches
  • Exhaust brake control
• Communication:
  • SAE J1939 data link (backbone harness)
  • SAE J1587 data link
• Diagnostic systems:
  • Stop lamp
  • Warning / maintenance lamp
  • Wait-to-start lamp
  • Water-in-fuel lamp
• Actuators:
  • Fan clutch
  • Exhaust brake
  • Cold start aid relays
• Power distribution:
  • 12V / 24V battery supply
  • Multiple fused circuits
  • Engine block grounding

👉 The diagram on page 2 clearly shows CAPS fuel system integration, ECM A connector pin mapping, and backbone J1939 network layout, including sensor wiring and actuator outputs.

Table of Content

• ECM Connector Layout (A & B Connectors)
• CAPS Fuel System (Pump, Accumulator, Injection Control)
• Sensor Network (Pressure / Temperature / Position)
• Accelerator & Remote Throttle Systems
• Diagnostic Lamps & Indicators
• Data Link Communication (J1939 Backbone / J1587)
• Actuator Control Systems (Fan, Brake, Relays)
• Power Supply & Ground Distribution

File Information

• Manufacturer: Cummins
• Engine Model: ISC
• ECM Type: CM554
• Fuel System: CAPS (Cummins Accumulator Pump System)
• Document Type: Wiring Diagram
• Format: PDF
• Pages: 2
• Content: Electrical Schematics, Pinout, CAPS & Sensor Systems