HARNESS AS-ENGINE 6I2763 - Caterpillar

Table 1
Diagnostic Trouble Codes for Excessive Soot Load
J1939 Code CDL Code Code Description
(code descriptions may vary) Comments
3719-16 E995 (2) DPF #1 Soot Loading Percent : High - moderate severity (2) The estimated soot load is above 116 percent.
Engine power is gradually derated as the soot load increases.
The emissions system failure lamp will flash.
3719-0 E995 (3) DPF #1 Soot Loading Percent : High - most severe (3) The estimated soot load is above 127 percent.
Engine power is derated 100 percent.
The emissions system failure lamp will flash and a warning horn will sound.
7440-31 E1645 (1) Aftertreatment Active Regeneration Inhibited Due to Low Exhaust Pressure The exhaust gas pressure is too low to support DPF regeneration. An excessive accumulation of soot in the DPF can be caused by the following faults:
Faulty soot sensor system
Oil in the exhaust system
Faulty injectors
A mechanical fault in a cylinder
Low exhaust gas pressure
A faulty exhaust back pressure valve
A fault in the NOx Reduction System (NRS)
Fuel with a high sulfur content
Table 2
Required Tools
Tool Part Number Part Description Qty
A 366-7782 Attenuator 1 Engine operation must be kept to a minimum to minimize the amount of soot that is created. Follow the troubleshooting procedure to minimize the amount of engine operation.Complete the procedure in the order in which the steps are listed.
Table 3
Troubleshooting Test Steps Values Results
1. Check for Active Diagnostic Trouble Codes
A. Turn the keyswitch to the ON position.
B. Connect the electronic service tool.
C. Check for active diagnostic trouble codes.
Diagnostic trouble codes
Result: A 3719-xx code is active.
Proceed to Test Step 2.
Result: A 7440-31 code is active.
Proceed to Test Step 6.
Result: A code other than 3719-xx or 7440-31 is active.
Diagnose and rectify the fault before continuing with this procedure. Refer to Troubleshooting, "Diagnostic Trouble Codes".
2. Visually Inspect the Soot Sensor System
A. Inspect the coaxial cables between the soot sensor and the antennas for damage.
B. Make sure that the antenna connectors are correctly tightened to 1.2 N m (10.6 lb in).
Soot sensor
Result: The soot sensor cables are damaged. Replace the soot sensor.
Proceed to Test Step 3.
Result: Other corrective actions were performed.
Repair: Start the engine and then use the electronic service tool to perform the "Aftertreatment Regeneration System Test".
Stop the engine and then check for a 3719-xx code.
If the 3719-xx code has been eliminated, proceed to Test Step 9.
If the 3719-xx code is still present, proceed to Test Step 3.
Result: No corrective actions were performed.
Proceed to Test Step 3.
3. Test the Soot Sensor System
A. Disconnect the soot antenna connectors and install Tooling A.
B. Perform the "DPF Soot Loading Sensor Functional Test" on the electronic service tool by selecting the following menus:
"Diagnostics"
"Diagnostic Tests"
"DPF Soot Loading Sensor Functional Test"
C. Disconnect the coaxial cables from the attenuator.
Soot sensor
Result: The "DPF Soot Loading Sensor Functional Test" fails.
Repair: Replace the soot sensor.
Use the electronic service tool to perform the "Aftertreatment Regeneration System Test". If necessary, diagnose any reported fault codes and then proceed to Test Step 9.
Result: The "DPF Soot Loading Sensor Functional Test" is successful.
Proceed to Test Step 4.
4. Check for Oil in the