Table 165
Troubleshooting Procedure for the DCU Keyswitch Signal
Troubleshooting Test Steps Value Results
1. Inspect Electrical Connectors and Wiring
A. Turn the keyswitch to the OFF position.
B. Inspect the connectors in the circuit for the DEF control
module.
Refer to Troubleshooting, “Electrical Connectors - Inspect”
for details.
C. Perform a 45 N (10 lb) pull test on each of the wires that
are associated with the DEF control module power circuit.
D. Check the screw for the P1 ECM connector for correct tor-
que of 6 N·m (53 lb in).
E. Check all the wiring associated with the DEF Control mod-
ule power circuit for abrasions and pinch points.
Damaged wire or
connector
Result: A damaged wire or damaged connector was found.
Repair: Repair the damaged wire or the damaged connector.
Use the electronic service tool to clear all logged diagnostic
codes.
Use the electronic service tool to perform the “Aftertreatment
System Functional Test” to verify that the repair eliminates
the fault.
Result: A damaged wire or damaged connector was not
found.
Proceed to Test Step 2.
2. Determine the Code
A. Establish communication between the electronic service
tool and the Electronic Control Module (ECM). Refer to Trou-
bleshooting, “Electronic Service Tools”, if necessary.
B. Download the “Warranty Report” from the ECM before
troubleshooting or clearing any diagnostic trouble codes.
C. Determine the diagnostic trouble code that is active.
Diagnostic Trou-
ble Code
Result: A -5 diagnostic code is active.
Proceed to Test Step 3.
Result: A -6 diagnostic code is active.
Proceed to Test Step 5.
3. Create a Short Circuit at the 31–Pin Connector
A. Disconnect the 31-pin connector.
B. Fabricate a jumper wire. Install the jumper wire between
terminal 4 on the 31-pin connector (ECM side) and a suitable
ground.
C. Turn the keyswitch to the ON position.
D. Use the electronic service tool to check for active diagnos-
tic codes.
Note: Other diagnostic codes will be active with the DCU
connector disconnected. Disregard all other codes and only
look for diagnostic codes that relate to the DCU keyswitch.
E. Turn the keyswitch to the OFF position.
Diagnostic codes Result: A -6 diagnostic code is active with the jumper
installed.
Proceed to Test Step 7.
Result: A -5 diagnostic code is active with the jumper
installed.
Remove the jumper wire. Proceed to Test Step 4.
(continued)
UENR4469-36 297
Circuit Tests
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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