Cummins ISB CM850 (2003-06) Fault Code: 155 (Auto) PID: 105 SPN: 105 FMI: 0 Intake Manifold 1 Temperature – Data Valid But Above Normal Operating Range – Most Severe Level. Intake manifold air temperature signal indicates intake manifold air temperature above engine protection critical limit. The intake manifold air temperature sensor measures the temperature of the charge-air as it passes through the intake manifold. Possible causes: 1)Restricted air flow through the charge-air cooler2)Undersized charge-air cooler3)High turbocharger compressor outlet temperature4)For marine engines, verify the cooling water intake is not blocked or clogged with debris. The sensor return configuration for Euro 4...

Cummins ISB CM850 (2003-06) Fault Code: 155 (Marine) PID: 105 SPN: 105 FMI: 0 Intake Manifold 1 Temperature – Data Valid but Above Normal Operational Range – Most Severe Level. Intake manifold air temperature signal indicates intake manifold air temperature above engine protection critical limit. The intake manifold air temperature sensor measures the temperature of the charge air as it passes through the intake manifold. Possible causes : 1)Restricted air flow through the charge air cooler2)Undersized charge air cooler3)High turbocharger compressor outlet temperature4)For marine engines verify the cooling water intake is not blocked or clogged with debris. Possible repairs: 1)Reference...

Cummins ISB CM850 (2003-06) Fault Code: 1633 PID: SPN: 625 FMI: 2 Komnet Datalink Cannot Transmit – Data Erratic, Intermittent, or Incorrect. Communications within the OEM datalink network is intermittent. This fault code is logged when J1939 data link communications between the OEM installed ECM’s and the Cummins engine ECM is intermittent. This fault is not triggered by the Cummins installed 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)Replace the OEM harness. Cummins ISB CM850 (2003-06) Fault Code: 1242 PID: SPN: 91 FMI:...

Cummins ISB CM850 (2003-06) Fault Code: 1639 PID: SID 51 SPN: 703 FMI: 11 Auxiliary Equipment Sensor Input Number 3 (OEM Switch) – Root Cause Not Known. This fault code is activated when the maximum inlet temperature or inlet pressure of a third party after-treatment system has exceeded the maximum allowable limits. A power derate may or may not be associated with this fault code. Possible repairs: 1)Replace the ECM.2)Repalce the OEM harness. Cummins ISB CM850 (2003-06) Fault Code: 1633 PID: SPN: 625 FMI: 2 Komnet Datalink Cannot Transmit – Data Erratic, Intermittent, or Incorrect. Communications within the OEM datalink...

Cummins ISB CM850 (2003-06) Fault Code: 1654 PID: SPN: 1323 FMI: 11 Engine Misfire Cylinder 1- Condition Exists. Engine misfire has been detected in cylinder number 1. If Fault Code 1654 is inactive in the ECM memory and there is no complaint such as ?low power? or ?engine misfire?, it is possible that an intermittent event such as air entering the fuel system following a filter change caused the fault. Inactive counts of Fault Code 1654 should be disregarded unless other performance symptoms are present. The engine coolant temperature must be greater than 71?C [160?F] before this diagnostic will run....