(Table 169, contd)
Troubleshooting Test Steps
Values Results
6. 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 As-
sembly, 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
DEF pump
replaced
Result: The DEF pump was replaced.
Proceed to Test Step 7.
7. Perform a DEF Dosing System Verification Test
A. Turn the keyswitch to the “ON” position. Do not start the
engine.
B. Connect to the “Diesel Exhaust Fluid Controller #1 ECM” using
the electronic service tool.
C. Perform the “DEF Dosing System Verification Test” .
Diagnostic codes
Result: The code did not return.
Return the unit to service.
Result: The code returned.
Contact the Dealer Solution Network (DSN).
i08786868
DEF Pump Pressure Sensor -
Test
Table 170 lists the diagnostic codes for the Diesel
Exhaust Fluid (DEF) pump pressure sensor circuit.
Table 170
Diagnostic Trouble Codes for the DEF Pump Pressure Sensor
J1939
Code
PDL Code
Code Description
(code descriptions may
vary)
Comments
4334-3 3090-3
Aftertreatment #1 SCR Dosing
Reagent Absolute Pressure :
Voltage Above Normal
There is excessive voltage on the signal wire between the Diesel Exhaust Fluid
Controller (DCU) and the DEF pump.
or
There is an open circuit on the supply, signal, or return wire.
The code is logged.
4334-4 3090-4
Aftertreatment #1 SCR Dosing
Reagent Absolute Pressure :
Voltage Below Normal
There is low voltage on the signal wire between the DCU and the DEF pump
pressure sensor.
The code is logged.
4334–20 3090–20
Aftertreatment #1 DEF #1 Pres-
sure (absolute) : Data Drifted
High
The signal from the DEF pump pressure sensor is above 10 kPa (1.5 psi) when
the DEF system is not primed.
4334–21 3090–21
Aftertreatment #1 DEF #1 Pres-
sure (absolute) : Data Drifted
Low
The signal from the DEF pump pressure sensor is below −10 kPa (−1.5 psi)
when the DEF system is not primed.
Follow the troubleshooting procedure to identify the root cause of the problem.
UENR4469-36 307
Circuit Tests
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