Continuation for all vehicles

NOTE: Repeat measurement if boost pressure was not fully charged or if the difference between actual and specified values was too large.

If boost pressure is exceeded:

Check the Charge Air Pressure Sensor -G31-, see CHARGE AIR PRESSURE SENSOR, CHECKING .
Check Wastegate Bypass Regulator Valve - N75-. (Throughput in hose from turbocharger via valve to vacuum diaphragm with connector disconnected), see WASTEGATE BYPASS REGULATOR VALVE, CHECKING .
Check for proper seating of vacuum diaphragm for wastegate bypass regulator valve at turbocharger.
Check vacuum diaphragm, see VACUUM DIAPHRAGM FOR WASTEGATE BYPASS REGULATOR VALVE, CHECKING
Check bearing for shaft of wastegate bypass regulator valve in turbocharger for ease of movement. If rusted solid, replace turbocharger.
Replace turbocharger, see item no. 6
Erase DTC memory of Engine Control Module (ECM), see DIAGNOSTIC MODE 4: RESET/ERASE DIAGNOSTIC DATA .
Generate readiness code, see READINESS CODE, GENERATING .

If boost pressure is not reached:

Check the Charge Air Pressure Sensor -G31-, see CHARGE AIR PRESSURE SENSOR, CHECKING .

Check Wastegate Bypass Regulator Valve - N75-, see WASTEGATE BYPASS REGULATOR VALVE, CHECKING .
Check bearing for shaft of wastegate bypass regulator valve in turbocharger for ease of movement. If rusted solid, replace turbocharger.
Replace turbocharger, see item no. 6
Erase DTC memory of Engine Control Module (ECM), see DIAGNOSTIC MODE 4: RESET/ERASE DIAGNOSTIC DATA .
Generate readiness code, see READINESS CODE, GENERATING