C175-16 Locomotive Engine Caterpillar

Dosing Signal - Test

Usage:

Use the procedure that below for the codes listed in the table or a problem with the Diesel Exhaust Fluid (DEF) dosing signal.

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Table 1
J1939 Code and Description	CDL Code and Description	Comments
8149-5 Aftertreatment DEF Doser Ready Status : Current Below Normal	3583-5 Switch Panel #1 : Current Below Normal
8149-6 Aftertreatment DEF Doser Ready Status : Current Above Normal	3583-6 Switch Panel #1 : Current Above Normal

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Table 2
Troubleshooting Steps	Value	Results
1. Check for Codes A. Connect Cat^® Electronic Technician (ET) to the dosing cabinet service port connector. B. Determine if the code is logged or active.	Codes	Result: A -5 code is present. Proceed to Test Step 2. Result: A -6 code is present. Proceed to Test Step 3.
2. Check the Wiring for an Open Circuit A. Verify that the harness connector is free of debris, corrosion, and secured. B. Remove the electrical power from the Selective Catalyst Reduction (SCR) Controller. C. Disconnect connector PR-C674 from the aftertreatment wiring harness. D. Install a jumper wire between the terminals E and F of the aftertreatment harness connector PR-C674. The aftertreatment harness is replaced with a short circuit. E. Restore the electrical power to the ECM. F. Connect Cat ET to the dosing cabinet service port connector. G. Monitor the active diagnostic code screen on Cat ET. Check and record any active diagnostic codes. Note: Wait at least 30 seconds in order for the diagnostic code to be-come active.	Create a Short	Result: A -5 code became active. The SCR controller did not detect the jumper wire. There is an open circuit between the aftertreatment wiring harness connector PR-C674 and the SCR ECM connector J1 PR-C5. There might be a problem with a connector. Repair: Repair or replace the connectors or wiring. Proceed to Test Step 4. Result: A -6 code became active. The SCR Controller detected the jumper wire. The wiring between the Selective Catalyst Reduction Controller and the PR-C674 connector is OK. There is a problem with the Aftertreatment Doser Ready Status input circuit between the PR-C674 connector and the customer connection. Repair: Repair or replace the wiring harness between the PR-C674 connector and the customer connection. Proceed to Test Step 4.
3. Check the Wiring to the Engine Harness for a Short Circuit A. Turn keyswitch to OFF. B. Disconnect connector PR-C674 from the aftertreatment wiring harness. C. Turn keyswitch to ON. D. Connect Cat ET using the dosing cabinet service port connector. E. Monitor the active diagnostic code screen on Cat ET. Check and record any active diagnostic codes.	Short Circuit	Result: A -5 code became active. The wiring between the Selective Catalyst Reduction Controller and the PR-C674 connector is OK. There is a problem with the Aftertreatment Doser Ready Status input circuit between the PR-C674 connector and the customer connection. Repair: Repair or replace the wiring harness between the PR-C674 connector and the customer connection. Proceed to Test Step 4. Result: A -6 code became active. There is a short circuit in the wiring between the aftertreatment wiring harness connector PR-C674 and the SCR System ECM connector J1PR-C5. There may be a problem with a connector. Repair: Repair or replace the connectors or wiring. Proceed to Test Step 4.
4. Check for Codes A. Connect Cat ET to the dosing cabinet service port connector. B. Determine if the code is logged or active.	Codes	Result: No codes are present. Return to service.

If the procedure did not correct the issue, contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).