Cummins ISB CM850 (2003-06) Fault Code: 245 PID: SID 33 SPN: 647 FMI: 4 Fan Control Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at the fan control circuit when commanded on.
The fan control logic can be adjusted with the INSITE? electronic service tool. There are two choices: 12 or 24 VDC ON, or 0 VDC ON. For proper fan operation, the fan control logic setup with INSITE? electronic service tool must match the hardware configuration on the vehicle.
This fault code is logged when the ECM commands 12 or 24 VDC to the fan control solenoid, but the voltage on the fan control signal circuit is less than 12 or 24 VDC. The low voltage on the signal circuit usually indicates a short circuit to ground in the harness or solenoid.
If Fault Code 245 is still active after completing the following troubleshooting steps, consult the OEM service literature for procedures to check the fan control circuit for a short circuit to ground.
1)Replace the fan control solenoid.
2)Repair or replace the OEM harness.
3)Replace the ECM.
Cummins ISB CM850 (2003-06) Fault Code: 242 PID: 84 SPN: 84 FMI: 10 Vehicle Speed Sensor Circuit Tampering Has Been Detected – Abnormal Rate of Change. Invalid or inappropriate vehicle speed signal. Signal indicates an intermittent connection or VSS tampering.
Cummins ISB CM850 (2003-06) Fault Code: 241 PID: 84 SPN: 84 FMI: 2 Vehicle Speed Sensor Circuit – Data Erratic, Intermittent or Incorrect. The ECM lost the vehicle speed signal.
Cummins ISB CM850 (2003-06) Fault Code: 238 PID: SID 232 SPN: 611 FMI: 4 Sensor Supply 3 Circuit – Voltage Below Normal, or Shorted to Low Source. Low voltage detected on the +5 volt sensor supply circuit to the engine speed sensor.
Cummins ISB CM850 (2003-06) Fault Code: 237 PID: SID 30 SPN: 644 FMI: 2 External Speed Command Input (Multiple Unit Synchronization) – Data Erratic, Intermittent, or Incorrect. The throttle input signal to the primary or secondary engine for multiple unit synchronization is less than 3 percent or more than 97 percent.
Cummins ISB CM850 (2003-06) Fault Code: 235 PID: 111 SPN: 111 FMI: 1 Coolant Level – Data Valid but Below Normal Operational Range – Most Severe Level. Low engine coolant level detected.
Cummins ISB CM850 (2003-06) Fault Code: 234 (Marine) PID: 190 SPN: 190 FMI: 0 Engine Crankshaft Speed/Position – Data Valid but Above Normal Operational Range – Most Severe Level. Engine speed signal indicates engine speed above engine protection limit.
