C9.3 Marine Auxiliary and Generator Set Engine Caterpillar

Intake Manifold Air Pressure Is Low

Usage:

C9.3 C93

System Operation Description:

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
J1939 Code and Description	Comments
102-18 Engine Intake Manifold #1 Pressure : Low - moderate severity (2)	The code is logged. Engine power is derated.
2630-1 Engine Charge Air Cooler Outlet Temperature : Low - most severe (3)	The code is logged due to a restriction in the intake manifold that can be causes by icing.

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Table 2
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" in order to troubleshoot the associated diagnostic code. Result: An associated code is not active or logged. Proceed to Test Step 2. Result: A 102-18 code is active. 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	g06203703
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 charge air cooler inlet.	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. 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.

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).