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...

Cummins ISB CM850 (2003-06) Fault Code: 1694 PID: SPN: 3234 FMI: 2 Aftertreatment Outlet NOx Sensor – Data Erratic, Intermittent, or Incorrect. An incorrect NOx sensor reading has been detected by the aftertreatment outlet NOx sensor. On-Board Diagnostics (OBD) information (Euro 4 Stage 1+ Certified Engines): 1)The ECM illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.2)An engine torque derate will be activated after 50 hours of engine operation with the fault code active.3)The ECM turns OFF the malfunction indicator lamp (MIL) after 1 ignition cycle that the diagnostic runs and...

Cummins ISB CM850 (2003-06) Fault Code: 1697 PID: SPN: 3489 FMI: 3 Aftertreatment #1 Air Enable Actuator ? Voltage Above Normal, or Shorted to High Source. High signal voltage has been detected at the catalyst air solenoid circuit. This fault code is logged when the supply voltage to the air solenoid is greater than +12 volts. Possible causes: 1)Air solenoid signal wire shorted to a voltage supply2)Failed dosing control unit. On-Board Diagnostics (OBD) Information (Euro 4 Certified Engines): 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)...

Cummins ISB CM850 (2003-06) Fault Code: 1698 PID: SPN: 3489 FMI: 4 Aftertreatment #1 Air Enable Actuator ? Voltage Below Normal, or Shorted to Low Source. Low signal voltage has been detected at the catalyst air solenoid circuit. This fault code is logged when the supply voltage to the air solenoid is less than +12 volts. Possible causes: 1)Open circuit in the air solenoid signal wire2)Open circuit in the air solenoid return wire3)Shorted to pin to pin air solenoid signal wire4)Failed air solenoid5)Failed dosing control unit. On-Board Diagnostics (OBD) Information (Euro 4 Certified Engines): 1)The ECM illuminates the malfunction indicator...