1399941 ENGINE AR-COMPLETE Caterpillar parts 3126 ENGINE
Alternative (cross code) number:
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1399941 SHORT BLOCK 0R8936 R
Compatible equipment models: 1399941:
TRUCK ENGINE 3126 Caterpillar
Diagnostic Trouble Code for Low Intake Manifold Air Pressure
J1939 Code CDL Code Code Description
(Code descriptions may vary) Comments
102-18 E1045 (2) Engine Intake Manifold #1 Pressure : Low - moderate severity (2) The pressure to trip this diagnostic code is a variable value that is calculated by the ECM. The resulting value depends on the operating conditions of the engine. Probable Causes
Intake air filter
Air intake system
Low battery voltage
Turbocharger or turbochargers
Turbocharger wastegateRecommended Actions
Note: The procedures have been listed in order of probability. Complete the procedures in order.
Troubleshooting Test Steps Values Results
1. Intake Air Filter
A. Check the air filter restriction indicator, if equipped.
B. Ensure that the air filter is clean and serviceable.
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:
Damage to the air intake ducts and hoses
Loose connections and air leaks
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. Wastegate Regulator
A. Use the electronic service tool to check for diagnostic codes that relate to the wastegate regulator.
Result: Diagnostic codes are present that relate to the wastegate regulator.
Repair: Rectify the cause of any related codes. Refer to Troubleshooting, "Diagnostic Trouble Codes".
Result: There are no diagnostic codes that relate to the wastegate regulator.
Proceed to Test Step 4.
4. Low Battery Voltage
Note: This possible cause of the fault is only applicable to 12 VDC systems. If the application operates with a 24 VDC system, proceed to Test Step 5 or Test Step 6, as applicable.
A. Use a suitable multimeter to check the output voltage from the battery or batteries.
Result: The battery voltage is less than 9.75 VDC.
Repair: The voltage requirement is not satisfied. Refer to Troubleshooting, "Battery Problem".
Ensure that any repairs have eliminated the fault.
Result: The battery voltage is OK.
For engines that have a single turbocharger, proceed to Test Step 5.
For engines that have two turbochargers, proceed to Test Step 6.
Note: The turbocharger that is installed on the engine is a nonserviceable item. If any mechanical fault exists, then the faulty 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.
Result: There is a fault in the turbocharger.
Repair: Replace the turbocharger. Refer to Disassembly and Assembly, "Turbocharger - Remove" and Disassembly and Assembly, "Turbocharger - Install".
Result: The turbocharger is OK.
Proceed to Test Step 7.
Note: The turbochargers that are installed on the engine are nonserviceable items. If any mechanical fault exists, then the faulty turbocharger must be replaced.
A. Check that the compressor housings for the
Caterpillar SIS machinery equipment:
Parts engine Caterpillar catalog:
1399868 ENGINE AR-COMPLETE