Intake Manifold Air Pressure Is Low
The Electronic Control Module (ECM) monitors the intake manifold air pressure.
Use this procedure in order to troubleshoot a problem with the intake manifold.
- Intake air filter
- Air intake system
- Turbocharger
Note: The procedures have been listed in order of probability. Complete the procedures in order.
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| Troubleshooting Test Steps | Values | Results |
|---|---|---|
1. Intake Air Filter A. Ensure that the air filter is clean and serviceable. |
Air filter |
Result: The air filter is blocked. Replace the air filter element. Refer to the Operation and Maintenance Manual, "Engine Air Cleaner Element - Replace". Result: The air filter is OK. Proceed to Test Step 2. |
2. Air Intake System A. Check the air intake system for the following defects: -Blockages -Restrictions -Damage to the air intake ducts and hoses -Loose connections and air leaks |
Air intake |
Result: The air intake system is blocked, restricted, damaged, or loose. Make all necessary repairs to the air intake system. Result: The air intake system is OK. Proceed to Test Step 3. |
3. Turbocharger Note: The turbocharger that is installed on the engine is a nonserviceable item. If any mechanical fault exists, then the turbocharger must be replaced. A. Check that the compressor housing for the turbocharger is free of dirt and debris. B. Check that the turbine housing for the turbocharger is free of dirt and debris. C. Check that the turbine blades rotate freely in the turbocharger. D. Check for movement on the shaft. E. Check waste gate. |
Turbocharger |
Result: There is a fault with the turbocharger. Replace the turbocharger. Refer to Disassembly and Assembly, "Turbocharger - Remove" and Disassembly and Assembly, "Turbocharger - Install". Verify that the repair eliminated the problem. |
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).
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