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.
The J1939 datalink connections are part of the OEM harness. Location of the J1939 harness will vary by the OEM. Refer to the OEM manual for specific component location.
The configuration of the three pins inputs to the electronic control module (ECM) on the OEM harness determines if an engine is a primary or secondary engine. To activate a pin, the pin must be grounded. To deactivate a pin, the pin must be open circuit.
1)Repair or replace the OEM harness.
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.
Cummins ISB CM850 (2003-06) Fault Code: 234 (Auto) PID: 190 SPN: 190 FMI: 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.
Cummins ISB CM850 (2003-06) Fault Code: 227 (Marine) PID: SID 232 SPN: 1080 FMI: 3 Sensor Supply 2 Circuit – Voltage Above Normal or Shorted to High Source. High voltage detected at sensor supply number 2 circuit.
Cummins ISB CM850 (2003-06) Fault Code: 227 (Auto) PID: SID 232 SPN: 1080 FMI: 3 Sensor Supply 2 Circuit – Voltage Above Normal or Shorted to High Source. High voltage detected at sensor supply number 2 circuit.
Cummins ISB CM850 (2003-06) Fault Code: 222 PID: 108 SPN: 108 FMI: 4 Barometric Pressure Sensor Circuit – Voltage Below Normal, or Shorted to Low Source. Low signal voltage detected at barometric pressure circuit.
