Cummins ISM CM870 (2003-06) Fault Code: 249 PID: P171 SPN: 171 FMI: 3/3 Ambient Air Temperature Sensor 1 Circuit - Voltage Above Normal or Shorted to High Source. High signal voltage detected at ambient air temperature circuit.

Possible causes:

1)Open return circuit in the harness, connectors, or sensor
2)Open signal circuit or shorted to a voltage source.

Possible repair:

1)Replace the OEM harness.
2)Replace the ambient air temperature sensor.
3)Replace the ECM.

Cummins ISM CM870 (2003-06) Fault Code: 245 PID: S033 SPN: 647 FMI: 4/4 Fan Control Circuit - Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at the fan control circuit when commanded ON.

Cummins ISM CM870 (2003-06) Fault Code: 242 PID: P084 SPN: 84 FMI: 10/10 Wheel-Based Vehicle Speed Sensor Circuit Tampering Has Been Detected - Abnormal Rate of Change. Signal indicates an intermittent connection or vehicle speed sensor (VSS) tampering.

Cummins ISM CM870 (2003-06) Fault Code: 241 PID: P084 SPN: 84 FMI: 2/2 Wheel-Based Vehicle Speed - Data Erratic, Intermittent, or Incorrect. The ECM lost the vehicle speed signal or is reading an erratic value.

Cummins ISM CM870 (2003-06) Fault Code: 234 PID: P190 SPN: 190 FMI: 0/0 Engine Crankshaft Speed/Position - Data Valid But Above Normal Operating Range - Most Severe Level. Engine speed signal indicates engine speed above engine protection limit.

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