Cumminz

Cummins ISB CM850 (2003-06) Fault Code: 1683 PID: SPN: 3449 FMI: 3 Catalyst Tank Heater Circuit ? Voltage Above Normal, or Shorted to High Source. High signal voltage detected at the catalyst tank heater relay sensor circuit. This fault code cannot detect any circuit failures on the heater side of the relay. Only circuit errors between the ECM and the relay can be detected by this fault code. Possible causes: 1)Catalyst tank heater relay signal wire not connected to the relay2)Catalyst tank heater relay return wire not connected to the relay3)Faulty catalyst tank heater relay4)Open circuit in the catalyst tank...

Cummins ISB CM850 (2003-06) Fault Code: 1684 PID: SPN: 3363 FMI: 4 Catalyst Tank Heater Circuit ? Voltage Below Normal, or Shorted to Low Source. Low signal voltage detected at the catalyst tank heater relay sensor circuit. This fault code cannot detect any circuit failures on the heater side of the relay. Only circuit errors between the ECM and the relay can be detected by this fault code. Possible causes: 1)A shorted catalyst tank heater relay2)Catalyst tank heater signal wire shorted to ground. 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: 1687 PID: SPN: 3050 FMI: 0 Catalyst Over Temperature – Data Valid but Above Normal Operational Range – Most Severe Level. Very high temperatures have been detected in the aftertreatment system. This fault is triggered when the temperature at the catalyst exhaust outlet exceeds the maximum allowable temperature for a given engine rating. On-Board Diagnostic (OBD) Information: 1)The ECM illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.2)The ECM turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail. The MIL...

Cummins ISB CM850 (2003-06) Fault Code: 1689 PID: 251 SPN: 251 FMI: 12 Real-Time Clock Power Interrupt – Data Erratic, Intermittent or Incorrect. The Real-Time clock power has been interrupted. This fault indicates that the real-time clock in the ECM lost power. Possible causes for this fault are weak or failed real-time clock battery, failed wiring or connectors between the battery and ECM, or the engine is not equipped with a real-time clock battery and the vehicle battery power to the ECM is lost. NOTE:If the Real Time Clock is supplied by the OEM via a CAN BUS and a...

Cummins ISB CM850 (2003-06) Fault Code: 1692 PID: SPN: 3234 FMI: 4 Aftertreatment NOx Sensor – Voltage Below Normal, or Shorted to Low Source. Out-of-range battery voltage has been detected by the aftertreatment outlet NOx sensor. The NOx sensor is permanently attached to the NOx control module. They are serviced as a single component and can not be replaced individually. Possible causes: 1)The voltage supplied to the aftertreatment outlet NOx sensor is below + 18-VDC2)The voltage supplied to the aftertreatment outlet NOx sensor is above + 32-VDC3)The aftertreatment outlet NOx sensor has malfunctioned or is damaged4)The aftertreatment outlet NOx sensor...