(Table 165, contd)
7. Check the Wiring for a Short to Ground
A. Turn the keyswitch to the OFF position.
B. Disconnect the P1 connector from the ECM.
C. Measure the resistance between P1:2 and a known
ground source.
D. Measure the resistance between P1:3 and a known
ground source.
Greater than 1 K
Ohms
Result: At least one of the resistance measurements is less
than 1 K Ohms. There is a short to ground in the wiring be-
tween the 31-pin connector and the ECM.
Repair: Replace the faulty wiring.
Use the electronic service tool to clear all logged diagnostic
codes and verify that the repair eliminates the fault.
Result: Both resistance measurements are greater than 1 K
Ohms.
Proceed to Test Step 8.
8. Check if a Replacement DEF pump Eliminates the
Fault
A. Make sure that the latest flash file for the application is in-
stalled in the DCU.
B. Install a replacement DEF pump. Refer to Disassembly
and Assembly, Diesel Exhaust Fluid Pump - Remove and In-
stall for the correct procedure.
Reset the Dosing Control Unit (DCU) and install new DCU
software. Refer to Troubleshooting, ECM Software - Install
(Dosing Control Unit) for the correct procedure
C. Turn the keyswitch to the ON position. Use the electronic
service tool to perform the “Aftertreatment System Functional
Test” and verify that the repair eliminates the fault.
Fault eliminated Result: The fault is eliminated with the replacement DEF
pump.
Return the unit to service.
Result: The fault is still present with the replacement DEF
Pump.
Contact the DSN.
i07561352
DEF Line Heater - Test
The Dosing Control Unit (DCU) monitors the voltage
and current flow to the Diesel Exhaust Fluid (DEF)
line heaters. Refer to Table 166 . Faults are notified
to the engine Electronic Control Module (ECM) over
the J1939 data bus.
The engine ECM sets a diagnostic trouble code if the
current flow through a circuit is incorrect. A -5 code
indicates that the current flow through the circuit is
low and there is an open circuit. A -6 code indicates
that the current flow through the circuit is high and
there is a short in the circuit.
Table 166 lists the diagnostic codes for incorrect
current flow.
Note: Sometimes a -5 code may be generated for a
high current condition or a -6 code may be generated
for a low current condition. If either code is active for
one of the DEF line heaters, follow the
troubleshooting for both codes.
UENR4469-36 299
Circuit Tests
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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