HOSE 7W0344 - Caterpillar

Table 1
Diagnostic Trouble Codes    
J1939 Code    CDL Code    Code Description
(code descriptions may vary)    Comments    
5576-2     3468-2     Aftertreatment #1 Identification : Erratic, Intermittent, or Incorrect     The installed Clean Emissions Module (CEM) #1 is not a certified match with the engine.
The code is a confirmed emissions regulation violation. A financial penalty and/or legal action may result, if the problem is not corrected immediately. Do not operate the engine with the active fault.
Engine power is derated.    
5576-8     3468-8     Aftertreatment #1 Identification : Abnormal Frequency, Pulse Width, or Period     Emissions do not conform to regulations. Do not continue to operate the engine with the active fault.
Engine power is derated.    
5577-2     3469-2     Aftertreatment #2 Identification : Erratic, Intermittent, or Incorrect     The installed Clean Emissions Module (CEM) #2 is not a certified match with the engine.
The code is a confirmed emissions regulation violation. A financial penalty and/or legal action may result, if the problem is not corrected immediately. Do not operate the engine with the active fault.
Engine power is derated.    
5577-8     3469-8     Aftertreatment #2 Identification : Abnormal Frequency, Pulse Width, or Period     Emissions do not conform to regulations. Do not continue to operate the engine with the active fault.
Engine power is derated.    
Follow the troubleshooting procedure in order to identify the root cause of the problem.    Complete the procedure in the order in which the steps are listed.
Table 2
Troubleshooting Test Steps    Values    Results    
1. Check for Diagnostic Trouble Codes
A. Establish communication between Cat® Electronic Technician (ET) and the Electronic Control Module (ECM) . Refer to Troubleshooting, "Electronic Service Tools", if necessary.
B. Download the "Warranty Report" from the engine ECM before performing any troubleshooting or clearing diagnostic trouble codes.
   
Diagnostic Trouble Codes    
Result: A 3468-2, 3468-8, 5576-2, 5576-8, 3469-2, 5577-2, 3469-8, or 5577-8, diagnostic code is active.
Proceed to Test Step 2.
   
Illustration 1 g02896037
Typical CEM identification plate
Illustration 2 g03766279
CEM (typical) (1) Typical location of CEM identification plate
Table 3
Troubleshooting Test Steps    Values    Results    
2. Manually Enter the Aftertreatment Identification Information
The CEM identification plate is located on the electronics panel.
Factory Passwords are required for this procedure.
A. Confirm that a certified CEM is installed on the engine.
Contact your local Caterpillar dealer for a list of approved CEM and RF configurations for your engine.
B. Record the affected CEM serial number and the configuration group from the CEM Identification Plate.
C. Verify that the affected CEM is a certified match with the engine.
Contact a Caterpillar technical communicator, if necessary.
   
Certified Match    
Result: The affected CEM is a certified match with the engine.
Proceed to Test Step 3.
Result: The affected CEM is not a certified match for the engine.
Repair: Remove the affected CEM and replace the affected CEM with a certified match for the engine. Refer to Disassembly and Assembly for removal and installation procedures. When the new CEM is installed, the"Aftertreatment Identification Number Module" will begin communicating with the ECM and the diagnostic code