C9.3 Engines for Caterpillar Built Machines Intake Manifold Air Pressure Is Low Caterpillar

Intake Manifold Air Pressure Is Low

C9.3 Engines for Caterpillar Built Machines [KENR5393]

AIR INLET AND EXHAUST SYSTEM

MANIFOLD GP-INLET

C9.3 Engines for Caterpillar Built Machines Intake Manifold Air Pressure Is Low

System Operation Description:

Table 1 lists the diagnostic trouble code for low intake manifold air pressure.

Show/hide table

Table 1
Related Diagnostic Trouble Codes
Event Code	Description	Comments
E1045(2)	Low Intake Manifold Pressure	The code is logged. Engine power is derated.

Show/hide table

Table 2
Troubleshooting Test Steps	Values	Results
1. Check for Codes A. Connect Cat Electronic Technician (ET) to the service tool connector. B. Download the "Product Summary Report" from the engine Electronic Control Module (ECM) before performing any troubleshooting or clearing diagnostic trouble codes. C. Check for an E583 High Air Inlet #1 Differential Pressure that is active or logged.	Code	Result: A E583 code is active or logged Repair: Refer to Troubleshooting, Inlet Air Is Restricted for troubleshooting information. Result: E1045 is active or logged. Proceed to Test Step 2.
2. Check the Air Filter for Restrictions A. Visually inspect the air filter elements for plugging. Check that the air filter housing is in good repair. Ensure that any damage to the housing is not causing an air restriction at the air inlet. B. Visually inspect the inlet piping between the air filter housing and the turbocharger. Check the piping for dents and damage that may cause restriction.	Air Filter	Result: The air filters are OK and the inlet is not restricted. Proceed to Test Step 3. Result: A restricted filter element is found. Repair: Clean the filter elements or replace the filter elements. Repair any inlet restriction that is found. Verify that the problem has been resolved.

Show/hide table




Illustration 1	g02068395
Rubber couplings for the air intake system piping (left side engine view)

Show/hide table

Table 3
Troubleshooting Test Steps	Values	Results
3. Inspect the Air Piping and Connections A. Visually inspect the air intake system piping from the turbocharger compressor outlet to the inlet of the air-to-air aftercooler core. Also, inspect the piping from the outlet of the air-to-air aftercooler to the intake of the engine. Check that the piping is in good repair and check that the piping is not leaking. B. Remove the rubber couplings for the piping that are on each side of the engine. Inspect the couplings for air leaks.	Air Piping and Connections	Result: The piping and rubber couplings are OK. Repair: Replace the couplings. Ensure that the clamps are tight. Verify that there are no leaks in the system. Proceed to Test Step 4. Result: A problem with the piping has been identified. Repair: Replace the damaged piping or hose connections. Verify that the problem has been resolved. STOP
4. Inspect the Turbocharger A. Remove the connection for the inlet air and the exhaust connection to the turbocharger. Verify that the compressor wheel and the turbine wheel are spinning freely. Verify that the compressor wheel and the turbine wheel are not damaged.	Turbocharger	Result: The turbocharger is damaged. Repair: Replace the turbocharger. Return the engine to service.

Test Step 1.

The procedure corrected the issue. Return to service.

Results:

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