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Catalyst Tank Level Sensor Circuit — Voltage Below Normal, or Shorted to Low Source
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 1668 PID: SPN: 1761 FMI: 4/4 LAMP: Amber SRT: |
Catalyst Tank Level Sensor Circuit — Voltage Below Normal, or Shorted to Low Source. Low signal voltage detected at the catalyst tank level sensor circuit. |
Catalyst solution injection into the aftertreatment system is disabled. |
 Circuit: Catalyst Tank Level Sensor.
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Circuit Description
The catalyst tank level sensor is used to monitor the catalyst solution level inside the catalyst tank. The catalyst tanks level sensor is a combination sensor with the catalyst solution temperature sensor. The level and temperature sensors share a common return circuit.
Component Location
The catalyst tank level sensor is located in the catalyst solution tank. Location of the tank and level sensor is OEM dependent.
Shop Talk
The catalyst tank level sensor shares supply and return wires in the engine harness with other sensors. Opens and shorts in the engine harness can cause multiple fault codes to be active.
Before troubleshooting Fault Code 1668, check for multiple faults.
Possible causes of this fault code include:
- Signal circuit open or shorted to ground in the engine harness or sensor
- Supply line open or shorted to ground.
On-Board Diagnostics (OBD) Information (Euro 4 Certified Engines):
- 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.
On-Board Diagnostics (OBD) Information (Euro 4 Stage 1+ Certified Engines):
- The ECM illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
- An engine torque derate will be activated after 50 hours of engine operation with the fault code active.
- The ECM turns OFF the malfunction indicator lamp (MIL) after 1 ignition cycle that the diagnostic runs and does not fail. The MIL lamp cannot be cleared using the INSITE™ service tool.
- The fault code will be cleared from memory after 400 days or 9600 hours of engine operation.
Refer to Troubleshooting Fault Code t05-1668
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