SHAFT-TRACK IDLER 1313935 - Caterpillar

The probable cause of low inlet pressure of the Diesel Particulate Filter (DPF) is an exhaust leak.Use this procedure if the following event code is active. Refer to Troubleshooting, "Event Codes" for information about event codes.Note: Some of the following codes may not be applicable for certain applications.
Table 1
Diagnostic Trouble Codes    
J1939 Codes     CDL Code     Code Description
(code descriptions may vary)     Comments    
3609-17     E1154 (1)     Low DPF #1 Intake Pressure     The code is logged.    
3609-18     E1154 (2)     Low DPF #1 Intake Pressure     The code is logged.    Complete the procedure in the order in which the steps are listed.
Table 2
Troubleshooting Test Steps     Values     Results    
1. Inspect the Exhaust System for Leaks
A. Inspect the exhaust system for leaks between the exhaust manifold and the ARD aftertreatment assembly inlet.
B. Check the exhaust system for loose connections or open ports.
   
Exhaust Leaks    
Result: The exhaust system has leaks.
Repair: Repair the exhaust. Return the engine to service.
Result: The exhaust system does not have leaks.
Proceed to Test Step 2.
   
2. Inspect the Diesel Particulate Filter
A. Inspect the inlet of the DPF. Inspect the DPF for a missing or damaged DPF brick.
    Damaged DPF Brick    
Result: The DPF has a damaged or missing DPF brick.
Repair: Replace the damaged DPF or missing DPF brick. Return the engine to service.