Reductant System Malfunction Warning Test

Reductant System Malfunction Warning Test

Circuit/System Description

A Reductant System Malfunction Warning Test is required when the Service Emission System message or Service Exhaust System message is displayed on the driver information center (DIC).

Conditions for Running

The following conditions must be met in order to enable the scan tool Reductant System Malfunction Warning Test:

* The battery voltage is greater than 10 V.

* The engine speed is at idle.

* The engine coolant temperature (ECT) sensor is greater than 70°C (158°F).

* The Exhaust Gas Temperature Sensor 2 must be less than 150°C (302°F)

* The APP sensor is less than 1 %.

* The diesel exhaust fluid temperature is greater than -7°C (19°F) and not frozen.

* DEF level must be greater than 33 %.

* DEF level must not be in restriction warning status 4 or higher.

* The brake pedal and accelerator pedal are in the released position

* The transmission is in Park or Neutral.

Diagnostic Aids

The Reductant System Malfunction Warning Test will not be allowed or will be terminated if any of the following conditions occur:

* The engine oil temperature is out of range

* The engine speed is too high

* The transmission is shifted to Drive or Reverse

* The accelerator pedal is applied

* The brake pedal is applied

Reference Information

Description and Operation

Exhaust Aftertreatment System Description Exhaust Aftertreatment System Description

Scan Tool Reference

Control Module References Control Module References for scan tool information

Reductant System Malfunction Warning Test

Note:

* If the reductant level warning status is at level 4 or higher, fill the DEF tank and perform the Reductant Fluid Tank Level Reset procedure.

* The scan tool must remain connected to the DLC during the entire Reductant System Malfunction Warning Test.

* Do not perform the Reductant System Malfunction Warning Test if the diesel exhaust fluid (DEF) temperature is less than -7°C (19°F).

1. Verify DEF tank is full and not in restriction.

• If the reductant system is in restriction, fill the DEF tank and perform the scan tool Reductant Fluid Tank Level Reset procedure.

2. Engine idling and at operating temperature, observe the DTC information with a scan tool. Verify there are no DTCs set.

• If a DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.

3. Disconnect scan tool.

4. Ignition OFF, all vehicle systems OFF, this may take up to 2 minutes.

5. Engine idling, connect scan tool and select the scan tool Reductant System Malf Warning Test in the Output Controls menu and follow the instructions.

6. Command the Reductant System Malfunction Warning Test ON with a scan tool. The Reductant System Malfunction Warning Test should start and run at idle speed for up to 20 minutes.

• If the DIC message clears, the Reductant System Malfunction Warning Test is complete and the scan tool can be disconnected. If the Reductant System Malfunction Warning Test exceeds 20 minutes and the Service Emission System or the Service Exhaust System message is still displayed, restart test

7. When the Reductant System Malfunction Warning Test is complete the Service Emission System message or Service Exhaust System message turns OFF

• If the Service Emission System message or the Service Exhaust System message does not turn OFF after completing a second test, a condition with the system still exists