PLATE 9W6744 - Caterpillar

Table 3
Required Service Tools
Part Number Description
372-5260 Test Lead Tool Group
Illustration 1 g06114870
Illustration 2 g06108266
Table 4
Troubleshooting Test Steps Values Results
1. Check for Codes
A. Connect Cat® Electronic Technician (ET) to the service tool connector.
B. Determine if a code is active or logged.
Codes
Result:There is an active or there is a logged 3361-5, 3821-5, 3361-6, or 3821-6 code.
Proceed to Test Step 4.
Result: There is an active or there is a logged -5 code other than a 3361-5 or 3821-5 code.
Proceed to Test Step 2.
Result: There is an active or there is a logged -6 code other than a 3361-6 or 3821-6 code.
Proceed to Test Step 3.
2. Check the Wiring for an Open Circuit
A. Verify that the harness connector is free of debris, free of corrosion and securely connected.
B. Disconnect the solenoid from the harness.
C. Connect a jumper wire between the terminals of the harness connector for the affected coil. The coil is replaced with a short circuit.
Create a Short
Result: A -5 code became active during the electrical checkout. The ECM did not detect the jumper wire. There is an open circuit in the wiring between the coil and the ECM connector. There may be a problem with a connector.
Repair: Repair or replace the connectors or the wiring.
Verify that the repair eliminated the problem.
Result: A -6 code is activated during the electrical checkout. The ECM detected the jumper wire. There is a problem with the solenoid.
Repair: Replace the solenoid.
Verify that the repair eliminated the problem.
3. Check the Wiring for a Short Circuit
A. Disconnect the solenoid from the harness.
Create an Open
Result: A -6 code became active during the electrical checkout. The ECM did not detect the open circuit. There is a short circuit in the wiring between the coil and the ECM connector. There may be a problem with a connector.
Repair: Repair or replace the connectors or the wiring.
Turn the keyswitch to the OFF position for 2 minutes. The keyswitch must be off for 2 minutes to allow the DEF pump to purge, the code to reset, and the DCU to reset.
Verify that the repair eliminated the problem.
Result: A -5 code is activated during the electrical checkout. The ECM detected the open circuit. There is a problem with the solenoid.
Repair: Replace the solenoid.
Turn the keyswitch to the OFF position for 2 minutes. The keyswitch must be off for 2 minutes to allow the DEF pump to purge, the code to reset, and the DCU to reset.
Verify that the repair eliminated the problem.
4. Measure the Resistance of the Injector
Note: A 372-5260 Test Lead Tool Group is required for completing this procedure.
A. Turn the keyswitch to the OFF position. Allow 2 minutes to elapse before proceeding.
B. Disconnect the DEF injector from the applicable harness.
C. Inspect the connector for damage or debris.
D. Connect two 398-4987 Probe to the DEF injector. The probes must be used to prevent damage to the DEF injector connector.
E. Measure the resistance of the DEF injector.
Ohms
Result: