C13 Engines for Caterpillar Built Machines Caterpillar

Intake Manifold Air Pressure Is Low

Usage:

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

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

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Table 1
Diagnostic Trouble Codes
CDL Code	Code Description (code descriptions may vary)	Comments
E1045 (2)	Low Intake Manifold Pressure	The code is logged. Engine power is derated.
E1107 (3)	Low Intake Manifold Pressure	The code is logged due to a restriction in the intake manifold that can be caused by icing.
Follow the troubleshooting procedure to identify the root cause of the problem.

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Table 2
Associated Diagnostic Trouble Codes
E583

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Table 3
Troubleshooting Test Steps	Values	Results
1. Check for Diagnostic Trouble Codes A. Connect to Cat^® Electronic Technician (ET). B. Download the "Warranty Report" from the engine ECM before performing any troubleshooting or clearing diagnostic trouble codes. C. Determine if an associated code listed in Table 2 is active or logged. Table 2 lists associated diagnostic codes.	Codes	Result: An associated code is active. Repair: Refer to Troubleshooting, "Diagnostic Trouble Codes" to troubleshoot the associated diagnostic code. Result: An associated code is not active or logged. Proceed to Test Step 2. Result: An E1045 code is active. Proceed to Test Step 2. Result: A code is not active or logged. Proceed to Test Step 2.
2. Check the Air Inlet System for Restrictions A. Visually inspect the air filter for cleanliness on engines without an electronic monitoring system on the inlet air system. A mechanical indicator may be used to monitor inlet air restrictions. Use the indicator to determine the cleanliness of the inlet air system. Also, inspect the piping for restrictions.	Restrictions	Result: The air filter is clean and a restriction is not found. Proceed to Test Step 3. Result: The inlet air system is restricted. Repair: Clean the filter or replace the filter. Remove all obstructions in the inlet air piping. Verify that the problem has been resolved. If the problem still exists, proceed to Test Step 3.

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Illustration 1	g02023778
Typical points of inspection

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Table 4
Troubleshooting Test Steps	Values	Results
3. Inspect the Air Piping and Connections A. Inspect the piping and the hose connections from the turbocharger compressor outlet to the Air to Air Aftercooler (ATAAC) inlet ( if equipped). Remove the hose connections and inspect the hose connections for cuts or damage.	Connections	Result: The piping or hose connections were damaged. Repair: Replace the damaged piping or hose connections. Verify that the problem has been resolved. If the problem still exists, proceed to Test Step 4. Result: The piping was not damaged. Proceed to Test Step 4.
4. Perform the Turbocharger Compressor Bypass Valve Test A. Perform the Turbocharger Compressor Bypass Valve Test in Cat ET. The test will verify that the Turbocharger Compressor Bypass Valve (TCBV) is working properly.	Turbocharger Compressor Bypass Valve Test	Result: The Turbocharger Compressor Bypass Valve Test did not complete successfully. Repair: Replace the TCBV. Verify that the problem has been resolved. Perform the Turbocharger Compressor Bypass Valve Test. Return the engine to service if the test was successful. If the test was not successful, proceed to Test Step 5. Result: The Turbocharger Compressor Bypass Valve Test did complete successfully. Proceed to Test Step 5.
5. 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 wheels are damaged. Repair: Replace the turbocharger. Return the unit to service.