Cumminz

Cummins ISB CM850 (2003-06) Fault Code: 1665 PID: SPN: 3241 FMI: 4 Exhaust Gas Temperature 1 Circuit ? Voltage Below Normal, or Shorted to Low Source. Low signal voltage detected at the catalyst inlet temperature sensor circuit. The catalyst inlet temperature sensor shares return wires in the engine harness with other sensors. A shorted return can cause multiple fault codes to be active. 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 malfunction indicator lamp (MIL) when the diagnostic runs...

Cummins ISB CM850 (2003-06) Fault Code: 1666 PID: SPN: 3241 FMI: 3 Exhaust Gas Temperature 1 Circuit ? Voltage Above Normal, or Shorted to Low Source. High signal voltage detected at the catalyst inlet temperature sensor circuit Catalyst inlet temperature sensor shares return wires in the engine harness with other sensors. A shorted 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 the diagnostic...

Cummins ISB CM850 (2003-06) Fault Code: 1667 PID: SPN: 3241 FMI: 2 Exhaust Gas Temperature 1 ? Data Erratic, Intermittent, or Incorrect. The exhaust gas temperature #1 sensor is not changing with engine operating conditions. This diagnostic runs when the exhaust gas temperature sensors are compared to other engine temperatures during engine operation. The engine coolant temperature must be above 140?F before the diagnostic will run. If the value of the exhaust gas temperature #1 does not match the engine operating conditions, this fault code is logged. Possible causes: 1)Stuck in-range exhaust gas temperature #1 sensor2)High resistance in the exhaust...

Cummins ISB CM850 (2003-06) Fault Code: 1668 PID: SPN: 1761 FMI: 4 Catalyst Tank Level Sensor Circuit ? Voltage Below Normal, or Shorted to Low Source. Low signal voltage detected at the catalyst tank level sensor circuit. The catalyst tank level sensor shares supply and return wires in the engine harness with other sensors. Opens and shorts in the engine harness can cause multiple fault codes to be active. Before troubleshooting Fault Code 1668, check for multiple faults. Possible causes: 1)Signal circuit open or shorted to ground in the engine harness or sensor2)Supply line open or shorted to ground. On-Board...

Cummins ISB CM850 (2003-06) Fault Code: 1669 PID: SPN: 1761 FMI: 3 Catalyst Tank Level Sensor Circuit ? Voltage Above Normal, or Shorted to High Source. High signal voltage detected at the catalyst tank level sensor circuit. The catalyst tank level sensor shares supply and return wires in the engine harness with other sensors. Opens and shorts in the engine harness can cause multiple fault codes to be active. Before troubleshooting Fault Code 1669, check for multiple faults. Possible causes: 1)Open return circuit in the harness, connectors, or sensor2)Signal circuit shorted to sensor supply or battery voltage. On-Board Diagnostics (OBD)...