C15 and C18 Engines for Caterpillar Built Machines Caterpillar

Intake Manifold Air Pressure Is Low

Usage:

D9T NJH

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	J1939 Code	Code Description (code descriptions may vary)	Comments
E1045 (2)	102-18	Low Intake Manifold Pressure	The code is logged. Engine power is derated.
Follow the troubleshooting procedure in order to identify the root cause of the problem.

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Table 2
Troubleshooting Test Steps	Values	Results
1. Check for Diagnostic Trouble Codes A. Connect to Caterpillar Electronic Technician (ET). B. Download the "Warranty Report" from the engine ECM before performing any troubleshooting or clearing diagnostic trouble codes.	Codes	Result: An E1045 or 102-18 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. 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	g02893499
Typical points of inspection

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Table 3
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. 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. 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. Replace the turbocharger. Return the unit to service.

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

If the procedure corrected the issue, return the engine to service.

If the procedure did not correct the issue, Contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).