808728T Mercruiser ADAPTER ASSEMBLY

Table 1
Diagnostic Trouble Code for Low Intake Manifold Air Pressure
J1939 Code Code Description Notes
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 depends on the operating conditions of the engine. Probable Causes
Intake air filter
Air intake system
Turbocharger electronic wastegate regulator
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. Download Information Using the Electronic Service Tool
A. Use the electronic service tool to download the "Product Status Report" (PSR) with histograms before performing any troubleshooting or clearing any diagnostic codes.
Note: The downloaded information will be required by the Dealer Solutions Network (DSN) if troubleshooting assistance is required.
Downloaded information
Result: The information was successfully saved.
Proceed to Test Step 2.
Result: The electronic service tool information was not successfully saved.
Contact the Dealer Solutions Network (DSN) for guidance.
2. Create an Electronic Service Tool Snapshot
A. Select "Snapshot Viewer" on the electronic service tool, using menus: Information -> Snapshot -> Viewer
B. Select the event code and then click "View Graph".
C. Select the following parameter and then click OK.
Engine Speed
D. Select Save to "File to save" a Snapshot File (*.xml). This file will contain all the data in the snapshot and not only the data shown on the graph.
Note: The downloaded information will be required by the DSN if troubleshooting assistance is required.
Snapshot saved
Result: The electronic service tool snapshot was successfully saved.
Proceed to Test Step 3.
Result: The electronic service tool snapshot was not successfully saved.
Contact the DSN for guidance.
3. Intake Air Filter
A. Check the air filter restriction indicator, if equipped.
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 4.
4. 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 5.
5. Turbocharger Electronic Wastegate Regulator
A. Use the electronic service tool to perform the "Air System Motor Valves Verification Test" to check that the turbocharger wastegate is operating correctly.
B. Inspect the turbocharger. Refer to Systems Operation, Testing and Adjusting, "Turbocharger - Inspect".
Turbocharger wastegate
Result: Diagnostic codes became active during the "Air System Motor Valves Verification Test"
Repair: Troubleshoot the diagnostic codes. Refer to Troubleshooting, Diagnostic Trouble Codes.
If the wastegate is not operating correctly, disconnect the linkage from the actuator by removing the circlips. Check the crank on the turbine housing for free movement. If the crank moves freely, replace the wastegate actuator.
If the turbocharger wastegate is replaced, use the electronic service tool to perform the "Turbocharger Wastegate Actuator Replacement Reset".
Use the electronic service tool to perform the "Air System Motor Valve Verification Test" to verify that the repair eliminates the fault.
If the crank does not move freely, replace the turbocharger assembly. Refer to Disassembly and Assembly , Turbocharger - Remove and Disassembly and Assembly , Turbocharger - Install.
If the turbocharger is replaced, use the electronic service tool to perform the "Turbocharger Wastegate Actuator Replacement Reset".
Use the electronic service tool to perform the "Air System Motor Valve Verification Test" to verify that the repair eliminates the fault.
Result: There is a suspected fault in the wastegate or the wastegate actuator.
Repair: Replace the turbocharger. Refer to Disassembly and Assembly, "Turbocharger - Remove" and Disassembly and Assembly, "Turbocharger - Install".
If the turbocharger is replaced, use the electronic service tool to perform the "Turbocharger Wastegate Actuator Replacement Reset".
Use the electronic service tool to perform the "Air System Motor Valve Verification Test"
Result: The wastegate and the wastegate actuator operate correctly.
Proceed to Test Step 6.
6. Turbocharger
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.
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".
If the turbocharger is replaced, use the electronic service tool to perform the "Turbocharger Wastegate Actuator Replacement Reset".
Use the electronic service tool to perform the "Air System Motor Valve Verification Test"
Result: The turbocharger is OK.
Contact the Dealer Solutions Network (DSN).