Cummins Fault Code 1669 (3-Wire Sensor), PID P203D, SPN 1761 Aftertreatment Diesel Exhaust Fluid Tank Level Sensor Circuit – Voltage Above Normal or Shorted to High Source

Overview

Code

Fault Code: 1669 (3-Wire Sensor)

PID: P203D

SPN: 1761

FMI: 3

LAMP: Amber

SRT:

Reason

Aftertreatment Diesel Exhaust Fluid Tank Level Sensor Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the catalyst tank level sensor circuit. 

Effect

Possible reduced engine performance.

Circuit Description

The aftertreatment diesel exhaust fluid tank level sensor is used to monitor the aftertreatment diesel exhaust fluid level inside the aftertreatment diesel exhaust fluid tank.

Component Location

The aftertreatment diesel exhaust fluid tank level sensor is located in the aftertreatment diesel exhaust fluid tank. Location of the tank and level sensor is OEM dependent.  Refer to the OEM service manual.

Conditions for Running the Diagnostics

This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.

Conditions for Setting the Fault Codes

The Engine Control Module (ECM) detected the aftertreatment diesel exhaust fluid tank level sensor signal voltage was out of range high.

Action Taken When the Fault Code is Active

• The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.
• Engine torque will be reduced if the engine is operated for an extended period of time with this fault active.
• Engine torque will be severely reduced.

Vehicle speed will be limited to 8 km [5 mi] per hour after extended engine operation with the fault code active.

Conditions for Clearing the Fault Code

• To validate the repair, perform a key cycle, 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 diagnostic runs and passes.
• The ECM will turn off the amber CHECK ENGINE lamp immediately after 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 Talk

Possible causes of this fault code include:

• Open return circuit in the harness, connectors, or sensor
• Signal circuit shorted to sensor supply or battery voltage.

The type of diesel exhaust fluid tank temperature and level sensor used can vary depending on the vehicle OEM.  As a result, the physical and/or electrical sensor configuration may vary slightly from what is shown in the troubleshooting and wiring diagram information.

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. 

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