(Table 167, contd)
Troubleshooting Test Steps
Values Results
4. Create a Short Circuit at the Harness Connector for the
DEF Line Heater
A. Turn the keyswitch to the OFF position.
B. Disconnect the connector for the suspect line heater.
C. Fabricate a jumper wire that is 150 mm (6 inch) long.
D. Install the wire between the two pins on the harness con-
nector for the suspect line heater to create a short circuit.
E. Turn the keyswitch to the ON position. Use the electronic
service tool to override the suspect line heater.
F. Check for active diagnostic codes.
G. Remove the jumper wire from the connector for the line
heater.
Open circuit Result: A -5 diagnostic code was active before installing
the jumper. A -6 diagnostic code is active when the
jumper is installed - There is a fault in the line heater.
Repair: Temporarily connect a replacement for the sus-
pect line heater to the harness.
Turn the keyswitch to the ON position. Use the electronic
service tool to override the suspect line heater and
check for active diagnostic codes. Wait at least 30 sec-
onds in order for the codes to be displayed.
If the fault is eliminated, reconnect the suspect line heat-
er . If the fault returns, permanently install the replace-
ment line heater. Refer to Disassembly and Assembly
for the correct procedure.
Result: A -5 diagnostic code is still active with the jump-
er installed.
Proceed to Test Step 5.
5. Check the Wiring for an Open 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 sup-
ply terminal on the 31-pin connector and the supply terminal
on the line heater harness connector.
Refer to Illustration 101 .
D. Use a multimeter to check the resistance between the re-
turn terminal on the 31-pin connector and the return terminal
on the line heater harness connector.
Refer to Illustration 101 .
E. Reconnect the connectors.
Less than 2 Ohms Result: One of the measured resistances is greater than
2 Ohms - There is a fault in the wiring between the 31-
pin connector and the suspect line heater.
Repair: Replace the faulty wiring.
Use the electronic service tool to clear all logged diag-
nostic codes and verify that the repair eliminates the
fault.
Result: All measured resistances are less than 2 Ohms.
Proceed to Test Step 6.
(continued)
302 UENR4469-36
Circuit Tests
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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