Laminated fold-out factory wire diagram for the Cummins QSB3.9-30/QSB4.5-30/QSB5.9-30 engine control system. Includes specifications, & fault code info.
For ECM 3990517
- ECM pin locations
- Wire diagram (color-coded)
- 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.
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