PIPE AS 2740467 - Caterpillar

Table 1
J1939 Code CDL Code Code Description Comments
4374-5 3118-5 Aftertreatment #1 Diesel Exhaust Fluid Pump Motor Speed : Current Below Normal This code indicates there is problem with the DEF pump or the wiring harness.
4374-6 3118-6 Aftertreatment #1 Diesel Exhaust Fluid Pump Motor Speed : Current Above Normal This code indicates there is problem with the DEF pump or the wiring harness. Note: 372-5260 Test Kit is required for completing this procedure.
Table 2
Associated Codes
SPN/FMI CDL/FMI Code Description
4337-8 3096-8 Aftertreatment #1 DEF Temperature #1 Sensor : Abnormal Frequency, Pulse Width, or Period
Illustration 1 g03185736Complete the procedure in the order in which the steps are listed.
Table 3
Troubleshooting Test Steps Values Results
1. Check for Fault Codes
A. Turn the keyswitch to the ON position.
B. Connect Cat ET.
C. Record the Fault codes.
Codes
Result: An associated code is present.
Refer to appropriate troubleshooting story.
Result: A 3118 or 4374 code is present.
Proceed to Test Step 2.
2. Check for Opens in the Pump Electronic Tank Unit (PETU) Wiring Harness for the DEF Pump Motor Circuit
A. Turn the keyswitch to the "OFF" position. The keyswitch must be OFF for 2 minutes to allow the DEF pump to purge, reset the code, and reset the DCU.
B. Disconnect the PETU wiring harness from the DEF pump and the Diesel Exhaust Fluid Controller (DCU).
C. Connect the 398-5063 Break-out Connector to the DCU connector.
Connect the 398-5056 Break-out Connector to the pump connector.
The connectors must be used to prevent damage to the DCU and pump connectors.
D. Measure the resistance between terminal 9 (PWM +) on the DEF pump connector and terminal 46 (PWM +) on the 86 pin DCU connector.
E. Measure the resistance between terminal 8 (PWM -) on the DEF pump connector and terminal 26 (PWM -) on the 86 pin DCU connector.
F. Measure the resistance between terminal 10 (PWM SIGNAL) on the DEF pump connector and terminal 24 (PWM SIGNAL) on the 86 pin DCU connector.
Open Circuit
Result: There was less than 10 Ohms of resistance on all of the DEF pump motor circuit wires.
Proceed to Test Step 3.
Result: There was more than 10 Ohms of resistance on any one of the DEF pump motor circuit wires.
Repair: There is an open in the harness. Repair the wiring or replace the harness.
Verify that the problem is resolved.
Proceed to Test Step 4.
3. Check for Short Circuits in the PETU Wiring Harness for the DEF Pump Motor Circuit
A. Turn the keyswitch to the "OFF" position. The keyswitch must be OFF for 2 minutes to allow the DEF pump to purge, reset the code, and reset the DCU.
B. Disconnect the PETU wiring harness from the DEF pump and the DCU.
C. Connect the 398-5063 Break-out Connector to the DCU connector.
Connect the 398-5056 Break-out Connector to the pump connector.
The connectors must be used to prevent damage to the DCU and pump connectors.
D. Measure the resistance between terminal 9 (PWM +) on the DEF pump connector and