HUB 7G8459 - Caterpillar

The Electronic Control Module (ECM) monitors the intake manifold air pressure. The following event is associated with low intake manifold air pressure:
Table 1
J1939 Code and Description CDL Code and Description Comments
102-1
Engine Intake Manifold #1 Pressure : Low - most severe (3) E1045 (3)
Low Intake Manifold Pressure Engine power is derated.
102-18
Engine Intake Manifold #1 Pressure : Low - moderate severity (2) E1045 (2)
Low Intake Manifold Pressure Engine power is derated. Probable Causes
Intake air filter
Air intake system
Fuel SystemRecommended 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. Check for restrictions in the air inlet system.
B. Ensure that the air filter is clean and serviceable.
Air filter
Result: The air filter is blocked.
Repair: 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.
Repair: Make all necessary repairs to the air intake system.
Result: The air intake system is OK.
Proceed to Test Step 3.
3. Fuel System
A. Incorrect fuel flow to the engine can cause low intake manifold air pressure.
Fuel
Result: Test the fuel system.
Repair: Refer to Testing and Adjusting, "Fuel System Pressure - Test".
Contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).