C15 and C18 – Intake Manifold Air Pressure Is Low

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.

Table 1
Diagnostic Trouble Codes
CDL Code J1939 Code Code Description
(code descriptions may vary)
Comments
E1045 (3) 102-1 Engine Intake Manifold #1 Pressure : Low – most severe (3) The code is logged.
Engine power is derated.
E1045 (2) 102-18 Engine Intake Manifold #1 Pressure : Low – moderate severity (2) The code is logged.
Engine power is derated.
E1107 (3) 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.
Follow the troubleshooting procedure in order to identify the root cause of the problem.
Table 2
Associated Diagnostic Trouble Codes
E583
107-15
107-16
Table 3
Troubleshooting Test Steps Values Results
1. Check for Diagnostic Trouble CodesA. Connect to Caterpillar 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.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: 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 RestrictionsA. 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.


Illustration 1 g02023778
Typical points of inspection

 

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.

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 an ARD Air System Service Test

A. Perform the ARD Air System Service Test in Cat ET. The test will verify that the ARD air valve is working properly.

ARD Air Service Test Result: The ARD Air System Service Test did not complete successfully.

Replace the ARD air valve. Verify that the problem has been resolved. Perform the ARD Air System Service Test.

Return the engine to service if the test was successful. If the test was not successful, proceed to Test Step 5.

Result: The ARD Air System Service 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.

Replace the turbocharger. Return the unit to service.

Test Step 1.

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

Results:

  • The procedure corrected the issue. – STOP
  • 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

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