Table 167
Troubleshooting Test Steps
Values Results
1. 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 2.
2. 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 DEF line heaters.
Refer to Troubleshooting, “Electrical Connectors - Inspect” for
details.
C. Perform a 45 N (10 lb) pull test on each of the wires in the
31-pin connector and the DEF line heater connectors that are
associated with the active 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 DEF line heaters to the ECM.
Loose connection 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 and 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 3.
3. Check for Active Diagnostic Codes
A. Turn the keyswitch to the OFF position.
B. Connect the electronic service tool to the diagnostic
connector.
C. Turn the keyswitch to the ON position.
D. Use the electronic service tool to override each DEF line
heater.
E. Verify if any of the diagnostic codes that are listed in Table
166 are active.
F. Turn the keyswitch to the OFF position.
Diagnostic codes Result: A -5 diagnostic code is active.
Proceed to Test Step 4.
Result: A -6 diagnostic is active.
Proceed to Test Step 7.
(continued)
UENR4469-36 301
Circuit Tests
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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