(Table 169, contd)
Troubleshooting Test Steps
Values Results
3. Check the Battery Voltage
A. Turn the keyswitch to the OFF position.
B. Use a suitable multimeter to measure the battery voltage.
At least 12.5 V
for a 12 V
system
At least 25V for a
24V system
Result: The battery voltage is lower than the expected
range.
Repair: Refer to Troubleshooting, Battery Problem to in-
vestigate the cause of low battery voltage.
Result: The battery voltage is within the expected
range.
Proceed to Test Step 4.
4. Inspect Electrical Connectors and Wiring
A. Thoroughly inspect the 31-pin connector for the PEU. Refer to
Troubleshooting, “Electrical Connectors - Inspect” for details.
B. Thoroughly inspect the connectors for the coolant diverter valve
and the DEF injector. Refer to Troubleshooting, “Electrical Con-
nectors - Inspect” for details.
C. Perform a 45 N (10 lb) pull test on each of the wires in the 31-
pin and solenoid connectors associated with the diagnostic code.
D. Ensure that the DCU connector is securely connected and
locked in place.
E. Check the harness for corrosion, abrasion, and pinch points
from the solenoids to the ECM.
Loose connec-
tion or damaged
wire
Result: There is a fault in a connector or the wiring.
Repair: Repair any faulty connectors or replace the wir-
ing harness. Ensure that all the seals are properly in
place and ensure that the connectors are correctly
coupled.
Use the electronic service tool to clear all logged diag-
nostic codes.
Use the electronic service tool to perform the “Aftertreat-
ment System Functional Test” to verify that the repair
eliminates the fault.
Result: All connectors, pins, and sockets are correctly
coupled and/or inserted. The harness is free of corro-
sion, abrasion, and pinch points.
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 system to
prime.
Stop the engine and wait for the wait-to disconnect lamp
to switch off.
Turn the keyswitch to the ON position. Check for an ac-
tive 4334–20 or 4334–21 diagnostic code.
If the diagnostic code is no longer active, return the en-
gine to service.
If the diagnostic code is still active, proceed to Test Step
6.
(continued)
306 UENR4469-36
Circuit Tests
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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