Cummins ISB4.5 CM2150 Fault Code: 1697 PID: SPN: 3489 FMI: 3 Air Supply Actuator – Voltage Above Normal, or Shorted to High Source.

Circuit Description
The aftertreatment diesel exhaust fluid dosing unit air solenoid is used to enable and disable the truck air supply to the diesel exhaust fluid pump. The air is used to transport the diesel exhaust fluid to the diesel exhaust fluid injector.

Component Location
The aftertreatment diesel exhaust fluid dosing unit air solenoid is mounted to the back of the diesel exhaust fluid pump. The diesel exhaust fluid pump is original equipment manufacturer (OEM) mounted. Refer to the OEM service manual for more information.

Conditions for Running the Diagnostics
This diagnostic runs continuously when the keyswitch is in the ON position.

Conditions for Setting the Fault Codes
This fault code is logged when the supply voltage to the air solenoid is greater than +12-VDC.

Action Taken When the Fault Code is Active
-The engine control module (ECM) illuminates the amber CHECK ENGINE lamp and/or the malfunction indicator lamp (MIL) immediately after the diagnostic runs and fails.
-Diesel exhaust fluid injection into the SCR aftertreatment system is disabled.
-Engine torque will be reduced.

Conditions for Clearing the Fault Code
-This fault code can not be cleared with INSITE™ electronic service tool.
-To validate the repair, start the engine and let it idle for 1 minute.
-The ECM will turn off the amber CHECK ENGINE lamp and/or MIL immediately after the diagnostic runs and passes.
-Use INSITE™ electronic service tool to verify the fault code is inactive.
-The inactive fault code will be cleared from the memory after 9600 hours of engine operation without a reoccurrence.

Possible Causes
-Air solenoid signal wire shorted to a voltage supply
-Failed aftertreatment diesel exhaust fluid dosing unit.