C7.1 Engines and Generator Sets Caterpillar

Intake Manifold Air Pressure Is High

Usage:

C7.1 770

The Electronic Control Module (ECM) monitors the intake manifold air pressure. The following event is associated with high intake manifold air pressure:

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Table 1
Diagnostic Trouble Code for Intake Manifold Air Pressure Is High
J1939 Code	CDL Code	Code Description (Code descriptions may vary)	Comments
102-16	E1044 (2)	Engine Intake Manifold #1 Pressure : High - moderate severity (2)	This pressure is a variable value that is calculated by the ECM. The resulting value depends on the operating conditions of the engine.

Probable Causes

Turbocharger wastegate
Wastegate regulator

Recommended Actions

Note: The procedures have been listed in order of probability. Complete the procedures in order.

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Table 2
Troubleshooting Test Steps	Values	Results
1. Turbocharger Wastegate Note: The wastegate is attached to the high-pressure turbocharger. A. Check the operation of the wastegate on the turbocharger. B. Check the operation of the wastegate actuator on the turbocharger. Refer to Systems Operation, Testing, and Adjusting, "Turbocharger - Inspect".	Turbocharger wastegate	Result: Operation of the turbocharger wastegate is suspect. Repair: Disconnect the output rod in the wastegate actuator from the lever that operates the wastegate. Operate the wastegate lever by hand and check for full and free movement. Check that the output rod in the wastegate actuator is biased towards the retracted position. Connect the output rod in the wastegate actuator to the lever that operates the wastegate. If the wastegate is not operating correctly, replace the turbocharger. Refer to Disassembly and Assembly, "Turbocharger - Remove" and Disassembly and Assembly, "Turbocharger - Install". Result: There is a suspected fault in the wastegate or the wastegate actuator. Repair: Replace the turbocharger. Refer to Disassembly and Assembly, "Turbocharger - Remove" and Disassembly and Assembly, "Turbocharger - Install". Result: The wastegate and the wastegate actuator operate correctly. Proceed to Test Step 2.
2. Wastegate Regulator A. Use the electronic service tool to check for diagnostic trouble codes that relate to the wastegate regulator.	Wastegate regulator	Result: Diagnostic codes are present that relate to the wastegate regulator. Repair: Rectify the cause of any related codes. Refer to Troubleshooting, "Diagnostic Trouble Codes". Result: There are no diagnostic codes that relate to the wastegate regulator. Contact the Dealer Solutions Network (DSN).