Cumminz

Cummins ISB CM850 (2003-06) Fault Code: 1677 PID: SPN: 3031 FMI: 4 Catalyst Tank Temperature ? Voltage Below Normal, or Shorted to Low Source. Low signal voltage detected at the catalyst solution temperature sensor circuit. The catalyst solution temperature sensor shares return wires in the engine harness with other sensors. A shorted return can cause multiple fault codes to be active. Before troubleshooting Fault Code 1677, check for multiple fault codes. Possible causes: 1)Signal shorted to ground in the harness2)Signal shorted to return or ground in the sensor. On-Board Diagnostics (OBD) Information (Euro 4 Certified Engines): 1)The ECM illuminates the...

Cummins ISB CM850 (2003-06) Fault Code: 1678 PID: SPN: 3031 FMI: 3 Catalyst Tank Temperature ? Voltage Above Normal, or Shorted to High Source. High signal voltage or open circuit detected at the catalyst tank temperature sensor circuit The catalyst solution temperature sensor shares return wires in the engine harness with other sensors. An open return can cause multiple fault codes to be active. Possible causes: 1)Open return circuit in the harness, connectors, or sensor.2)Open signal circuit or shorted to a voltage source. On-Board Diagnostics (OBD) Information (Euro 4 Certified Engines): 1)The ECM illuminates the malfunction indicator lamp (MIL) when...

Cummins ISB CM850 (2003-06) Fault Code: 1679 PID: SPN: 3031 FMI: 2 Catalyst Tank Temperature ? Data Erratic, Intermittent, or Incorrect. The catalyst solution temperature sensor is not changing with engine operating conditions. This diagnostic runs when the engine has not been running for at least eight hours. The catalyst solution temperature sensor is compared to engine coolant temperature and intake manifold temperature when the key is turned on after the extended eight hour shutdown. This fault code is logged if the reading from the catalyst solution temperature sensor does not match the readings from engine coolant temperature and intake...

Cummins ISB CM850 (2003-06) Fault Code: 1681 PID: SPN: 3361 FMI: 12 Catalyst Dosing Control Unit ? Bad Intelligent Device or Component. An internal error has been detected in the catalyst dosing control unit. Fault code 1681 is triggered when the Dosing Control Unit has detected an internal error. The only troubleshooting that can be done is to recalibrate the engine ECM. If fault code 1681 is still active after the engine ECM has been recalibrated, the Dosing Control Unit will need to be replaced. On-Board Diagnostics (OBD) Information (Euro 4 Certified Engines): 1)The ECM illuminates the malfunction indicator lamp...

Cummins ISB CM850 (2003-06) Fault Code: 1682 PID: SPN: 3362 FMI: 11 Aftertreatment Diesel Exhaust Fluid Dosing Unit Input Lines – Condition Exists. An error has been detected by the catalyst dosing control unit. The diesel exhaust fluid dosing unit process consists of three phases, which occur in the following sequence: priming, dosing, and purging. Priming: 1)The diesel exhaust fluid dosing unit will attempt to prime every 30 seconds for 20 attempts. The attempts can be counted by listening for the air solenoid to click every 30 seconds.2)The diesel exhaust fluid dosing unit can take up to 12 minutes to...