(Table 171, contd)
Troubleshooting Test Steps
Values Results
4. Check if a Replacement DEF pump Eliminates the Fault
A. Make sure that the latest flash file for the application is installed
in the DCU.
B. Install a replacement DEF pump. Refer to Disassembly and
Assembly, Diesel Exhaust Fluid Pump - Remove and Install for
the correct procedure.
Reset the Dosing Control Unit (DCU) and install new DCU soft-
ware. Refer to Troubleshooting, ECM Software - Install (Dosing
Control Unit) for the correct procedure
Note: If this repair is part of a warranty claim, refer to Special In-
struction, M0119435
DEF pump replaced Result: The DEF pump was replaced.
Proceed to Test Step 5.
5. Check the DEF Pressure
A. Connect to the electronic service tool. If necessary, refer to
Troubleshooting, Electronic Service Tools.
B. Turn the keyswitch to the ON position. Do not start the engine.
C. Use the electronic service tool to check the “DEF Pressure”
parameter.
−10 kPa (−1.5 psi) to
10 kPa (1.5 psi) Result: The DEF pressure is between −10 kPa
(−1.5 psi) and 10 kPa (1.5 psi).
Repair: Start the engine and allow the DEF sys-
tem to prime.
Stop the engine and wait for the wait-to discon-
nect lamp to switch off.
Turn the keyswitch to the ON position. Check for
an active 4334–20 or 4334–21 diagnostic code.
If the diagnostic code is no longer active, proceed
to Test Step 6.
If the diagnostic code is still active, contact the
Dealer Solutions Network (DSN).
6. Perform a DEF Dosing System Verification Test
A. Turn the keyswitch to the “ON” position. Do not start the
engine.
B. Connect the electronic service tool.
C. Perform the “DEF Dosing Verification Test” .
Diagnostic codes Result: The code did not return.
Return the unit to service.
Result: The code returned.
Contact the Dealer Solutions Network (DSN).
i08787191
DEF Pump Sensor Supply -
Test
Table 172 lists the diagnostic codes for the Diesel
Exhaust Fluid (DEF) pump sensor circuit.
UENR4469-36 309
Circuit Tests
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