Cummins ISB CM850 (2003-06) Fault Code: 319 PID: 251 SPN: 251 FMI: 2 Real-Time Clock Power Interrupt – Data Erratic, Intermittent or Incorrect. Real-time clock lost power. This fault indicates that the real-time clock in the ECM lost power. Possible causes for this fault are weak or failed real-time clock battery, failed wiring or connectors between the battery and ECM, or the engine is not equipped with a real-time clock battery and the vehicle battery power to the ECM is lost. NOTE:If the Real Time Clock is supplied by the OEM via a CAN BUS and a battery backup is...

Cummins ISB CM850 (2003-06) Fault Code: 322 PID: SID 1 SPN: 651 FMI: 5 Injector Solenoid Driver Cylinder 1 Circuit – Current Below Normal or Open Circuit. High resistance or no current detected at number 1 injector driver or RETURN pin. 1)Fault activation: The ECM senses current as each injector is actuated. If the ECM detects a persistent circuit error on an injector circuit, this fault will become active. If a circuit error is determined to cause excessive current, the ECM will disable the injection event for the faulty cylinders(s).2)Fault deactivation: The ECM will attempt to enable any disabled injector...

Cummins ISB CM850 (2003-06) Fault Code: 323 PID: SID 5 SPN: 655 FMI: 5 Injector Solenoid Driver Cylinder 5 Circuit – Current Below Normal or Open Circuit. High resistance or no current detected at number 5 injector driver or RETURN pin. 1)Fault activation: The ECM senses current as each injector is actuated. If the ECM detects a persistent circuit error on an injector circuit, this fault will become active. If a circuit error is determined to cause excessive current, the ECM will disable the injection event for the faulty cylinders(s).2)Fault deactivation: The ECM will attempt to enable any disabled injector...

Cummins ISB CM850 (2003-06) Fault Code: 324 PID: SID 3 SPN: 653 FMI: 5 Injector Solenoid Driver Cylinder 3 Circuit – Current Below Normal or Open Circuit. High resistance or no current detected at number 3 injector or RETURN pin. 1)Fault activation: The ECM senses current as each injector is actuated. If the ECM detects a persistent circuit error on an injector circuit, this fault will become active. If a circuit error is determined to cause excessive current, the ECM will disable the injection event for the faulty cylinders(s).2)Fault deactivation: The ECM will attempt to enable any disabled injector circuit...

Cummins ISB CM850 (2003-06) Fault Code: 325 PID: SID 6 SPN: 656 FMI: 5 Injector Solenoid Driver Cylinder 6 Circuit – Current Below Normal or Open Circuit. High resistance or no current detected at number 6 injector driver or RETURN pin. 1)Fault activation: The ECM senses current as each injector is actuated. If the ECM detects a persistent circuit error on an injector circuit, this fault will become active. If a circuit error is determined to cause excessive current, the ECM will disable the injection event for the faulty cylinders(s).2)Fault deactivation: The ECM will attempt to enable any disabled injector...