PLUG AS 1488409 - Caterpillar

The Electronic Control Module (ECM) monitors the intake manifold air pressure. The following code is associated with low intake manifold air pressure:
Table 1
Code for Low Intake Manifold Air Pressure    
J1939 Code    Code Description    Comments    
102-18     Engine Intake Manifold #1 Pressure : Low - moderate severity     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
TurbochargerRecommended Actions
Note: The procedures have been listed in order of probability. Complete the procedures in order.
Table 2
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.
   
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".
Result: The turbocharger is OK.
Contact the Technical Communicator at a Cat dealer.