SHAFT 2S0520 - Caterpillar

Which Generate This Code:The Electronic Control Module (ECM) detects all of the following conditions for thirty seconds:
The engine speed is between 1275 rpm and 1800 rpm.
The rack position is between 17 mm (0.67 inch) and 25 mm (0.98 inch). The actual boost pressure is 20 kPa (3 psi) above the desired boost pressure.System Response:The ECM will log the event. The fuel is derated by 30 percent. The timing is retarded to four degrees before top dead center. The event code is latched until power is cycled to the ECM.
Reduced power
Test Step 1. Check for "ACTIVE" Diagnostic Codes
Start the Caterpillar Electronic Technician (ET).
Turn the main power to the ON position.
Check for any active diagnostic codes or logged diagnostic codes.Expected Result:No diagnostic codes are present.Results:
OK - No diagnostic codes are present.Repair: Refer to Systems Operation/Testing and Adjusting, SENR5092 for information on inspecting the exhaust bypass.STOP
Not OK - There are diagnostic codes that are present.Repair: Repair the diagnostic codes that are present. Refer to the appropriate topic in the "Troubleshooting With a Diagnostic Code" section of this manual. Ensure that the repair eliminates the problem.STOP