Complete the procedure in the order in which the
steps are listed.
Table 171
Troubleshooting Test Steps
Values Results
1. Check that the latest available software is installed and
there are no applicable Technical Information Bulletins or
Special Instruction documentation released
A. Ensure that the latest software is installed on the engine ECM.
B. Ensure that the latest software is installed on the Dosing Con-
trol Unit (DCU)
If necessary, refer to Troubleshooting, “ECM Software - Install” for
the correct procedure.
C. Ensure all Technical Information Bulletins and/or Special In-
struction documented for the issue and/or product are reviewed
and followed.
Software and
Publications
Result: The latest software is not installed.
Repair: Install the latest engine ECM software
and then install the latest DCU software. If neces-
sary, refer to Troubleshooting, “ECM Software -
Install” for the correct procedure.
Start the engine and wait for 2 minutes.
If the fault is cleared, return the engine to service.
If the fault is still present, proceed to Test Step 2.
Result: Applicable Technical Information Bulle-
tin/Special Instruction publication is available.
Repair: Review and follow instructions provided
in the available publication.
Result: The latest software is installed.
Proceed to Test Step 2.
2. Check for Active Diagnostic Codes
A. Connect to the electronic service tool. If necessary, refer to
Troubleshooting, Electronic Service Tools.
B. Check for active diagnostic codes.
Diagnostic codes
Result: A -3 or -4 diagnostic code is active.
Proceed to Test Step 4.
Result: A -20 or -21 diagnostic code is active.
Proceed to Test Step 3.
3. 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If the diagnostic code is no longer active, return
the engine to service.
If the diagnostic code is still active, proceed to
Test Step 4.
(continued)
308 UENR4469-36
Circuit Tests
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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