EDGE-END 1U0761 - Caterpillar

Use this procedure in order to troubleshoot high intake manifold air pressure. Also, use this procedure if one of the following event codes is active.
Table 1
Event Codes
CDL Code and Description Conditions which Generate this Code System Response
E1044(1) High Intake Manifold Pressure The intake manifold air pressure is above the trip point for the programmed delay time. The code is logged.
E1044(2) High Intake Manifold Pressure The code is logged.
The engine power is derated.
E1044(3) High Intake Manifold Pressure Probable Causes
Diagnostic codes and event codes
Air inlet and exhaust restrictions
Full Load Setting (FLS)
Wastegate Valve (High Altitude Only)
Intake Manifold Air Pressure SensorsRecommended Actions
Note: The procedures have been listed in order of probability. Complete the procedures in the order of the listed test steps.
Table 2
Troubleshooting Test Step Value Result
1. Check for Codes
A. Connect Caterpillar Electronic Technician (ET) to the service tool connector. Refer to Troubleshooting, "Electronic Service Tools", if necessary.
B. Download the "Product Status Report" from the engine ECM before performing any troubleshooting or clearing diagnostic trouble codes.
C. Determine if the diagnostic trouble code that directed to this procedure is present.
D. Look for active diagnostic codes that are associated with the system for the event code that directed to this procedure.
E1044
Result: An associated code is present.
Repair: Troubleshoot any associated codes before continuing with this test.
Result: An E1044 code is present.
Proceed to the next step.
Result: No active codes
STOP
2. Air Inlet and Exhaust Restrictions
A. Check the air filter for damage. If necessary, replace damaged air filters. Refer to the Operation and Maintenance Manual.
B. Check the air inlet and exhaust system for restrictions and/or leaks. Make any necessary repairs. Refer to Systems Operation/Testing and Adjusting
Restriction
Result: The air inlet and exhaust systems are ok.
Repair: Proceed to the next step.
Result:An air inlet or exhaust system problem was identified.
Repair: Repair the problem with the air inlet or exhaust system. If the problem is not resolved, proceed to the next step.
3. Check the Full Load Setting (FLS)
A. Verify that the FLS is correct for your engine and engine application.
FLS
Result: The FLS is not correct.
Repair: Program the correct FLS.
4. Inspect the Wastegate Assembly (High Altitude Only)
A. Inspect the wastegate valve for any damaged or missing parts
B. With the engine off, remove the boost line from the wastegate actuator canister located on top of the wastegate valve. Apply 290 kPa (42 psi) of air pressure from an external source to the actuator canister. Ensure the butterfly valve opens and closes freely through the full range of motion. Do NOT over-pressurize the actuator canister.
Note: Reinstall boost line onto actuator canister once step is complete.
Note: Some air leakage from the wastegate canister is normal and acceptable as designed. Do not replace a wastegate valve for small air leaks around the wastegate actuator.
Wastegate Functionality
26 2°
Result: Wastegate is found to have damaged or missing parts.
Repair: Repair or replace damaged or missing parts.
Verify the repair resolved the issue. Return to service.
Result: Wastegate butterfly valve does not open freely or travel through its range of motion.
Repair: Replace wastegate assembly.
Verify the repair resolved the issue. Return to service.
Result: Wastegate butterfly