Cummins ISB CM850 (2003-06) Fault Code: 331 PID: SID 2 SPN: 652 FMI: 5 Injector Solenoid Driver Cylinder 2 Circuit – Current Below Normal or Open Circuit. High resistance or no current detected at number 2 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: 332 PID: SID 4 SPN: 654 FMI: 5 Injector Solenoid Driver Cylinder 4 Circuit – Current Below Normal or Open Circuit. High resistance or no current detected at number 4 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: 334 PID: 110 SPN: 110 FMI: 2 Engine Coolant Temperature – Data Erratic, Intermittent, or Incorrect. The engine coolant temperature reading is not changed with engine operating conditions. Two different failure modes of the engine coolant temperature sensor can trigger this fault code. The engine must be turned off for period of 8 hours before this diagnostic will run. When the keyswitch is turned ON after an 8 hour cold soak, engine coolant temperature is compared to intake manifold temperature. If coolant temperature is found to be higher than intake manifold temperature by a...

Cummins ISB CM850 (2003-06) Fault Code: 341 PID: SID 253 SPN: 530 FMI: 2 Engine Control Module Data Lost – Data Erratic, Intermittent or Incorrect. Severe loss of data from the ECM. Possible no noticeable performance effects, engine dying or hard starting. Fault information, trip information, and maintenance monitor data can be inaccurate. Possible repairs: 1)Charge or replace the battery.2)Tighten the loose connections and clean the terminals.3)Repair or replace the OEM harness.4)Replace the fuses. Cummins ISB CM850 (2003-06) Fault Code: 334 PID: 110 SPN: 110 FMI: 2 Engine Coolant Temperature – Data Erratic, Intermittent, or Incorrect. The engine coolant temperature...

Cummins ISB CM850 (2003-06) Fault Code: 342 PID: SID 253 SPN: 630 FMI: 13 Electronic Calibration Code Incompatibility – Out of Calibration. An incompatable calibration between the primary and secondary OEM installed ECM’s has been detected. This fault code is logged when incompatible calibrations between the primary and secondary OEM installed ECM’s is detected The fault is not triggered by the Cummins installed engine ECM and is only stored as an information fault code. Do not recalibrate or change the Cummins ECM for this fault code. Possible repairs: 1)Incompatible calibrations have been detected in the OEM installed primary and secondary...