Cummins ISM 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.

Possible causes:

1)Loose, missing, or corroded grounds
2)Damaged tone wheel teeth
3)Loose crankshaft tone wheel
4)Static timing misset
5)Front gear train slippage
6)Misoriented engine speed or camshaft position sensor
7)Electrical noise.

Possible repairs:

1)Replace the speed or position sensor.
2)Replace the crankshaft or injector camshaft, whichever has malfunctioned.

Cummins ISM CM870 (2003-06) Fault Code: 692 PID: S151 SPN: 1172 FMI: 4/4 Turbocharger 1 Compressor Intake Temperature Circuit - Voltage Below Normal, or Shorted to Low Source. Low signal voltage detected at turbocharger compressor intake air temperature circuit.

Cummins ISM CM870 (2003-06) Fault Code: 691 PID: S151 SPN: 1172 FMI: 3/3 Turbocharger Number 1 Compressor Inlet Temperature Sensor Circuit - Voltage Above Normal or Shorted to High Source. High signal voltage detected at the turbocharger compressor inlet air temperature circuit.

Cummins ISM CM870 (2003-06) Fault Code: 689 PID: P190 SPN: 190 FMI: 2/2 Engine Crankshaft Speed/Position - Data Erratic, Intermittent, or Incorrect. The ECM has detected an error in the engine speed signal.

Cummins ISM CM870 (2003-06) Fault Code: 687 PID: P103 SPN: 103 FMI: 1/18 Turbocharger 1 Speed - Data Valid But Below Normal Operating Range - Moderately Severe Level. Low turbocharger speed detected by the engine control module (ECM).

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