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Cummins ISC/ISL Wire Diagram CM850


Cummins ISC/ISL Wire Diagram CM850

Cummins ISC and ISL factory printed laminated wire diagram for CM850 modules.

Printed by Cummins.  Laminated fold-out factory wire diagram for the engine control system for this Cummins engine.  Includes specifications, & fault code info.

Whether you are chasing ECM fault codes or ECM related wiring issues this laminated wire diagram is a real lifesaver.  Wire diagrams are color coded for ease of use.

For fault codes, it provides fault diagnostics & solutions.  For electronic control issues it provides information such as ohms, volts and steps for troubleshooting & repairing.

Since it is laminated, it is easy to keep clean and increases its life.

Cummins ISC/ISL Wire Diagram (CM850)
Cummins ISC/ISL Wire Diagram (CM850)


  • ECM pin locations
  • Wire diagram (color-coded)
  • Connectors
  • Each controlled or controlling sensor, etc.
  • Cummins responsibility & truck manufacturer responsibility connections
  • Electrical specifications & reading parameters (volts-amps-ohm readings)
  • Fault codes, fault reasons, fault effects

Laminated surface allows for the use of erasable marker to make notes while performing diagnostics which can be erased when finished.

Cummins ISC/ISL Wire Diagram (CM850)