VALVE GP-RELIEF 1U1786 - 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) High Diesel Particulate Filter #1 Soot Loading - Level 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) High Diesel Particulate Filter #1 Soot Loading - Level 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 (if equipped). The Electronic Control Module (ECM) uses the soot sensors to monitor the soot load in the Diesel Particulate Filter (DPF). 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 regulator
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.
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.
Check for active diagnostic trouble codes.
Result: A 3719 (E995) code is active.
Proceed to Test Step 2.
Result: A 7440-31 (E1645) code is active.
Proceed to Test Step 6.
Result: A code other than the codes listed in Table 1 is active.
Repair: 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.
Repair: Replace the soot sensor.
Proceed to Test Step 3.
Result: Other corrective actions were performed.
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 (E995) code.
If the 3719 (E995) code has been eliminated, proceed to Test Step 9.
If the 3719 (E995) 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