C7.1 Engines For Caterpillar Built Machines Caterpillar

Intake Manifold Air Pressure Is Low

Usage:

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

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Table 1
Code for Low Intake Manifold Air Pressure
CDL Code	Description	Information
E1045-2	Low Intake Manifold Pressure - Level 2	This pressure is a variable value that is calculated by the ECM. The resulting value is dependent on the operating conditions of the engine.

Probable Causes

Intake air filter
Air intake system
Engine intake throttle valve
Wastegate regulator
Turbochargers

Recommended Actions

Intake Air Filter

Ensure that the air filter is clean and serviceable.

If necessary, replace the air filter element. Refer to the Operation and Maintenance Manual, "Engine Air Cleaner Element - Replace".

Check that the fault has been eliminated.

If the fault has not been eliminated, proceed to "Air Intake System".

Air Intake System

Check the air intake system for the following defects:
- Blockages
- Restrictions
- Damage to the air intake ducts and hoses
- Loose connections and air leaks

Make all necessary repairs to the engine.

Ensure that the repairs have eliminated the fault.

If the fault has not been eliminated, proceed to "Engine Intake Throttle Valve".

Engine Intake Throttle Valve

Use the electronic service tool to check for diagnostic trouble codes that relate to the engine intake throttle valve. Rectify the cause of any related codes. Refer to Troubleshooting, "Diagnostic Trouble Codes".

Use the electronic service tool to monitor the function of the engine intake throttle valve. If the valve is not operating correctly, replace the valve. refer to Disassembly and Assembly, "Engine Intake Throttle Valve - Remove and Install".

Ensure that the repairs have eliminated the fault.

If the fault has not been eliminated, proceed to "Wastegate Regulator".

Wastegate Regulator

Use the electronic service tool to check for diagnostic trouble codes that relate to the wastegate regulator. Rectify the cause of any related codes. Refer to Troubleshooting, "Diagnostic Trouble Codes".

Ensure that any repairs have eliminated the fault.

If the fault has not been eliminated, proceed to "Turbochargers".

Turbochargers

Note: The turbochargers that are installed on the engine are nonserviceable items. If any mechanical fault exists, then the faulty turbocharger must be replaced.

Check that the compressor housings for the turbochargers are free of oil, dirt, and debris.

Check that the turbine housings for the turbochargers are free of oil, dirt, and debris.

Check that the turbine blades rotate freely in the turbochargers.

If necessary, replace the faulty turbocharger. Refer to Disassembly and Assembly, "Turbocharger - Remove" and Disassembly and Assembly, "Turbocharger - Install".