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Cummins ISX CM870 (2003-06) Fault Code: 1943 PID: SPN: 3555 FMI: 1/17 Ambient Air Density – Data Valid But Below Normal Operational Range – Least Severe Level. Engine torque has been reduced because the vehicle was operating at a high altitude condition.
The most common cause of this fault code is high altitude. The fault code can also be caused by extreme ambient air temperatures. This derate can be viewed in the INSITE? electronic service tool, User Fueling State, as Air Density Limit State.
NOTE: The engine must be loaded to trip this fault code in the shop. The engine must be under the same operating conditions (altitude and temperature) at the time that it had originally logged.
Possible repair:
1)Replace the barometric pressure sensor.2)Calibrate the ECM, use the INCAL? DVD with the proper calibration software phase.
Cummins ISX CM870 (2003-06) Fault Code: 1228 PID: P27 SPN: P27 FMI: 2/2 EGR valve position sensor circuit – data erratic, intermittent, or incorrect.
Cummins ISX CM870 (2003-06) Fault Code: 1119 PID: P110 SPN: 110 FMI: 0/16 Engine Coolant Temperature – Data Valid but Above Normal Operating Range – Moderately Severe Level. Engine coolant temperature signal indicates coolant temperature is above the engine coolant temperature engine protection warning limit.
Cummins ISX CM870 (2003-06) Fault Code: 951 PID: 951 SPN: 166 FMI: 2/2 A power imbalance between cylinders was detected by the electronic control module (ECM).
Cummins ISX CM870 (2003-06) Fault Code: 784 PID: SPN: 1590 FMI: 2 Adaptive Cruise Control Mode – Data Erratic, Intermittent, or Incorrect. Loss of communication with adaptive cruise control.
Cummins ISX CM870 (2003-06) Fault Code: 778 PID: S64 SPN: 723 FMI: 2/2 Engine Camshaft Speed / Position Sensor – Data Erratic, Intermittent, or Incorrect.? The ECM has detected a loss of signal from the camshaft position sensor.
Cummins ISX CM870 (2003-06) Fault Code: 731 PID: S064 SPN: 723 FMI: 7/7 Engine Speed Sensor and Camshaft Position Sensor – Mechanical Misalignment Between Camshaft and Crankshaft Sensors. Engine position signal from the engine speed sensor and camshaft position sensor do not match.