Intake Manifold Air Pressure Is Low
Use this procedure in order to troubleshoot a low intake manifold air pressure. Also use this procedure if the following engine event is active. Access the engine monitoring system on Caterpillar Electronic Technician (ET) in order to view the current trip points for these codes. Refer to Troubleshooting, "Engine Monitoring Parameters" for information about engine events.
Show/hide table
| Engine Event | ||
|---|---|---|
| J1939 Code and Description | Conditions that Generate this Code | System Response |
| 102-18 Engine Intake Manifold #1 Pressure : Low - moderate severity (2) | The intake manifold air pressure has dropped below the trip point for the programmed delay time. | The code is logged. |
- Air inlet restrictions
- Air intake system piping
- Improper fuel flow to the engine
Check for restrictions in the air inlet system. Refer to the Systems Operation/Testing and Adjusting manual for information on inspecting the air inlet system.
Look for the following problems in the lines between the turbocharger compressor and the intake manifold:
- Piping that is damaged
- Loose clamps
- Cracked fittings
Repair any problems. Replace parts, if necessary.
Incorrect fuel flow to the engine can cause low intake manifold air pressure. Test the fuel system. Refer to Testing and Adjusting, "Fuel System Pressure - Test" for details.
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