CM850 Electronic Control System – FAULT CODE 1699

Catalyst Tank Level Sensor — Data Erratic, Intermittent, or Incorrect.


Fault Code: 1699
SPN: 1761
FMI: 2
LAMP: Amber

Catalyst Tank Level Sensor — Data Erratic, Intermittent, or Incorrect. Catalyst solution level is not changing with engine operating conditions.

Catalyst solution injection into the aftertreatment system is disabled.


Circuit Description

The catalyst tank level sensor is located in the catalyst tank. Location of the tank and level sensor is OEM dependent.

Component Location

The catalyst solution tank location is OEM dependent.

Shop Talk

This fault code is triggered when the catalyst solution level reading in the catalyst tank does not change with engine operating conditions. If the catalyst dosing control unit indicates that catalyst injection has occurred, but the catalyst tank level has not changed, this fault code will be triggered. This fault will also be triggered if catalyst injection has not occurred, but a drop in the level of the catalyst solution has been detected.

Using INSITE™, check to make sure the adjustable parameter Linear Urea Tank Volume is adjusted correctly. This fault code can trigger if this parameter is not adjusted for the correct urea tank volume.

Possible causes of this fault code include:

  • Failed catalyst tank level sensor
  • Plugged or restricted catalyst solution lines
  • Plugged or restricted aftertreatment nozzle
  • External leaks in the catalyst tank or catalyst solution lines
  • Catalyst tank level sensor tampering.

On-Board Diagnostics (OBD) Information:

  • The ECM illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails
  • The ECM turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail. The MIL lamp and fault code can also be cleared using the INSITE™ service tool.
  • The fault code will be cleared from memory after 40 consecutive drive cycles where the diagnostic runs and passes.

Refer to Troubleshooting Fault Code t05-1699

Last Modified:  08-Jul-2010