Cummins ISX12 CM2250 (2010-12) Fault Code: 477 PID: 444 SPN: 444 FMI:| ⛽ Diezel365

Circuit DescriptionThe aftertreatment diesel exhaust fluid controller communicates with the ECM and controls the heating, dosing, and purging of the aftertreatment diesel exhaust fluid system.

Component LocationThe aftertreatment diesel exhaust fluid controller is installed on the vehicle by the OEM. Refer to the OEM service manual for component location.

Conditions for Running the DiagnosticsThis diagnostic runs continuously when the engine is running.

Conditions for Setting the Fault CodesThe aftertreatment diesel exhaust fluid controller detects that the battery supply voltage is lower than a threshold.

Action Taken When the Fault Code is ActiveThe ECM illuminates the amber CHECK ENGINE lamp and/or Malfunction Indicator Lamp (MIL) immediately when the diagnostic runs and fails.Diesel exhaust fluid injection into the aftertreatment system is disabled.Conditions for Clearing the Fault CodeTo validate the repair, start the engine and let it idle for 1 minute.The fault code status displayed by INSITE? electronic service tool will change to INACTIVE immediately after the battery voltage rises above 10-VDC and the diagnostic runs and passes.The ECM will turn off the amber CHECK ENGINE lamp after the diagnostic runs and passes.For On Board Diagnostic (OBD) engines, the ECM will turn off the MIL after 3 consecutive trips where the diagnostic runs and passes.The ?Reset All Faults? command in INSITE? electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.

Shop TalkPossible causes of this fault code include:

Improper battery voltage setting in INSITE? electronic service toolA damaged alternator causing low voltageA weak or damaged battery.Reference the appropriate OEM wiring diagram when troubleshooting circuits that utilize wiring supplied by the OEM.

For intermittent power supply and datalink communication issues with Aftertreatment Components, it is highly recommended that the OEM Power Distribution Center fuses and relays be thoroughly checked for loose, missing or intermittent connections.

Possible Cause:1) Loose Connections/ Terminals2) Fuses3) OEM harness4) ECM calibration

Cummins ISX12 CM2250 (2010-12) Fault Code: 452 PID: 157 SPN: 157 FMI: 3 Injector Metering Rail 1 Pressure Sensor Circuit- Voltage Below Normal or shorted to Low Source

Cummins ISX12 CM2250 (2010-12) Fault Code: 451 PID: SPN: 157 FMI: 3 Injector Metering Rail 1 Pressure Sensor Circuit- Voltage Above Normal or shorted to High Source

Cummins ISX12 CM2250 (2010-12) Fault Code: 449 PID: 157 SPN: 157 FMI: 0 Injector Metering Rail 1 Pressure- Data Valid Above Normal Operating Range- Most Severe Level

Cummins ISX12 CM2250 (2010-12) Fault Code: 442 PID: 168 SPN: 168 FMI: 16 Battery 1 Voltage- Data Valid But Above Normal Operational Range- Moderately Severe Level

Cummins ISX12 CM2250 (2010-12) Fault Code: 441 PID: 168 SPN: 168 FMI: 18 Battery 1 Voltage- Data Valid But Below Normal Operational Range- Moderately Severe Level

Cummins ISX12 CM2250 (2010-12) Fault Code: 436 PID: 111 SPN: 105 FMI: 2 Intake Manifold 1 Temperature- Data Erratic, Intermittent, or Incorrect

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