SPIDER ASSEM. 6N0053 - Caterpillar

Use this procedure to troubleshoot a low NOx conversion. Also, use this procedure if one of the following event codes is active or logged.
Table 1
J1939 Code and Description CDL Code and Description Comments
3516-16
Aftertreatment #1 DEF Concentration : High - least severe (1) E1365 (2)
High Aftertreatment #1 DEF Concentration The Diesel Exhaust Fluid (DEF) has a high concentration.
3516-18
Aftertreatment #1 DEF Concentration : Low - least severe (1) E1364 (2)
Low Aftertreatment #1 DEF Concentration The DEF has a low concentration.
4364-17
Aftertreatment #1 SCR Catalyst Conversion Efficiency : Low - least severe (1) E1309 (1)
Low Aftertreatment #1 SCR Catalyst Conversion Efficiency The NOx conversion across the Selective Catalyst Reduction (SCR) catalyst is lower than expected.
4364-18
Aftertreatment #1 SCR Catalyst Conversion Efficiency : Low - moderate severity (2) E1309 (2)
Low Aftertreatment #1 SCR Catalyst Conversion Efficiency The NOx conversion across the SCR catalyst is lower than expected.
Table 2
Required Tools Qty
464-1955 Tool Case As 1 Probable Causes
Codes
DEF quality
DEF pump
DEF pressure line
Urea deposits
SensorRecommended Actions
Table 3
Troubleshooting Test Steps Values Results
1. Check for Codes
A. Connect Cat® Electronic Technician (ET) to the service tool connector.
B. Look for active codes that are associated with the system for the event code.
Codes
Result: An associated code is active.
Repair: Troubleshoot any associated codes before continuing with this test.
Result: A code is active or logged.
Proceed to Test Step 2.
2. Check the DEF Quality
A. Use either a 431-7087 Tool Gp (DEF Refractometer) or a 360-0774 Refractometer (Brix) to measure the DEF quality. Refer to Testing and Adjusting, "Diesel Exhaust Fluid Quality - Test" for additional information.
Note: The 431-7087 Tool Gp (DEF Refractometer) will not measure above 40 percent DEF concentration. The 360-0774 Refractometer (Brix) will read up to 53 percent Brix and must be used when measuring DEF concentration on marine applications.
26 percent to 51 percent DEF (25 percent to 49 percent Brix)
Result: The DEF quality is within the acceptable range.
Proceed to Test Step 3.
Result: The DEF quality is not within the acceptable range.
Repair: Drain the DEF fluid from the tank. Refill the tank with DEF that is concentrated to either 26 percent to 51 percent DEF (25 percent to 49 percent Brix).
Proceed to Test Step 3.
3. Check the DEF Pump
A. Turn the AC and DC breakers to the OFF position.
B. Remove the DEF line that runs to the DEF injector from the dosing cabinet.
C. Install the DEF line attachment included in the 464-1955 Tool Case As.
D. Run the DEF line into the container included in the 464-1955 Tool Case As.
E. Turn the AC and DC breakers to the ON position.
F. Connect Cat ET.
G. Use Cat ET to perform the following test:
- "DEF Dosing System Accuracy Test"
Note: While performing this test, the test hose can contain up to an extra 140 mL (4.76 oz) of fluid. If this fluid drains into the test container, the total volume of DEF will be 2145 200 mL.
2