C13, C15, and C18 Engines Troubleshooting – Diesel Particulate Filter Has High Inlet Pressure

System Operation Description:

Use this procedure if the following event code is active. Refer to Troubleshooting, “Event Codes” for information about event codes.

Note: Refer to Troubleshooting, “Cat ET Service Features” for information about service features.

Table 1
Diagnostic Trouble Codes
CDL Code J1939 Code Code Description
(code descriptions may vary)
Comments
E1156 (1) 3609-15 High DPF #1 Intake Pressure The code is logged.
Table 2
Associated Diagnostic Trouble Codes
E995
E997
3719-16
3719-0
3720-15
3720-16
Table 3
Troubleshooting Test Steps Values Results
1. Check for Associated Diagnostic Trouble Codes

A. Establish communication between the Caterpillar Electronic Technician (ET) and the engine Electronic Control Module (ECM).

B. Download the “Warranty Report” from the engine ECM before performing any troubleshooting or clearing diagnostic trouble codes.

C. Determine if any of the codes in Table 2 are present.

Associated Diagnostic codes Result: An associated diagnostic trouble code is not present.

Proceed to Test Step 2.

Result: An associated diagnostic trouble code is present.

Refer to Troubleshooting, “Diagnostic Trouble Codes” in order to troubleshoot the associated diagnostic code.

If the problem is not resolved, proceed to Test Step 2.

2. Ash Service Maintenance

A. Determine the most recent cleaning of the Diesel Particulate Filter (DPF).

Cleaning interval Result: The diesel particulate filter was cleaned within the last 5000 hours.

Proceed to Test Step 3.

Result: The diesel particulate filter was not cleaned within the last 5000 hours.

Proceed to Test Step 4.

3. Check for Contamination

A. Reset all active codes and clear all logged codes by cycling the keyswitch to the Off position.

B. Remove the DPF.

C. Check for contamination on the face of the DPF and the Diesel Oxidation Catalyst (DOC).

Contamination Result: There is oil, fuel, or coolant on the DPF and/or the DOC.

Perform the following procedure:

1. Clean the DPF. Refer to the engines “Diesel Particulate Filter (DPF) Cleaner Manual” for the cleaning procedure.

2. Cleaning the DPF is not an ash service cleaning. Do not reset the engine ash model. The ash cannot be removed from the DPF if soot is present.

3. Reconnect the DOC and the DPF.

4. Start the engine. Run the engine at 1400 RPM with no load. Run the engine for at least 15 minutes or run the engine until there is no more white smoke.

If the 1156-1 or 3609-15 diagnostic code remains active replace the DPF. Refer to Special Instruction, REHS5045, “Diesel Particulate Filter (DPF) Maintenance on Tier 4 Products Equipped with a Diesel Particulate Filter (DPF)”. Return the unit to service.

4. Perform an Ash Service

A. Reset all active codes and clear all logged codes by cycling the keyswitch to the Off position.

B. Clean the DPF. Refer to Special Instruction, REHS5045, “Diesel Particulate Filter (DPF) Maintenance on Tier 4 Products Equipped with a Diesel Particulate Filter (DPF)”. Refer to Systems Operation and Testing and Adjusting, “Diesel Particulate Filter – Clean” for the correct procedure.

C. Perform an “ARD Ignition Test” in Cat ET. Check for the 1156-1 or 3609-15 diagnostic code.

The ARD Ignition Test cannot be performed if the DPF soot loading is above 80%. When the DPF soot loading is above 80%, the Manual DPF Regeneration must be performed using Cat ET.

Active codes Result: There are no active diagnostic codes.

Return the unit to service.

Result: The 1156-1 or 3609-15 diagnostic code is active.

Replace the DPF. Reset all active codes and clear all logged codes by cycling the keyswitch to the Off position. Perform an “ARD Ignition Test” in order to verify that the problem is resolved.

Return the unit to service.

Test Step 1.

Complete the procedure in the order in which the steps are listed.

Results:

 

  • The procedure corrected the issue. – STOP 
  • The procedure did not correct the issue. –Repair: Contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).

    STOP

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