(Table 167, contd)
Troubleshooting Test Steps
Values Results
8. Check the Wiring for a Short Circuit
A. Turn the keyswitch to the OFF position.
B. Disconnect the 31-pin connector and the connector for the
suspect line heater.
C. Use a multimeter to check the resistance between the sus-
pect supply terminal on the 31-pin connector and all other ter-
minals on the connector. Refer to Illustration 101 .
D. Use a multimeter to check the resistance between the sus-
pect return terminal on the 31-pin connector and all other ter-
minals on the connector. Refer to Illustration 101 .
E. Reconnect the connectors.
Greater than 100
Ohms
Result: At least one of the resistance measurements is
less than 100 Ohms - The fault is in the wiring between
the 31-pin connector and the suspect line heater.
Repair: Repair the faulty harness or replace the faulty
harness. Use the electronic service tool to verify that the
repair eliminates the fault.
Result: All resistance measurements are greater than
100 Ohms.
Proceed to Test Step 9.
9. Check the Wiring for a Short to Ground
A. Turn the keyswitch to the OFF position.
B. Disconnect the connector for the suspect line heater.
C. Use a multimeter to measure the resistance between the
line heater supply terminal on the harness connector and a
known ground source.
Greater than 1 k
Ohm
Result: The measured resistance is less than 1 k Ohm.
There is a short to ground in the wiring for the suspect
line heater.
Repair: Replace the faulty wiring. Use the electronic
service tool to verify that the repair eliminates the fault.
Result: The measured resistance is greater than 1 k
Ohm.
Contact the Dealer Solutions Network (DSN).
i08786864
DEF Pump - Test
The Dosing Control Unit (DCU) monitors and controls
the Diesel Exhaust Fluid (DEF) pump via voltages,
current, and PWM signals.
The DCU sets a diagnostic trouble code if an error is
detected in one or more of these parameters.
A -5 code indicates that the current flow through the
circuit is low and there is an open in the circuit. A -6
code indicates that the current flow through the circuit
is high and there is a short in the circuit. These codes
can be activated only when the DCU is sending a
command to the DEF pump.
Table 168 lists the diagnostic codes for the DEF
pump circuit.
304 UENR4469-36
Circuit Tests
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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