Charge Pressure Control, Checking
Charge Pressure Control, Checking
Engine codes APH, BKF, BNU
Special tools, testers and auxiliary items required
- Turbocharger tester V.A.G 1397 A
Requirements
- No leaks on intake and exhaust systems
- Engine oil temperature 60 degrees C min
Work sequence
The charge pressure is measured during wide open throttle, when driving or on a rolling road. The test takes 10 seconds max. per measurement.
- Pull off connecting hose between intake manifold and fuel pressure regulator on intake manifold and connect with T-piece of turbocharger tester V.A.G 1397 A.
- Switch measuring range I on.
NOTE:
- Using turbocharger tester Operating instruction.
- The hoses must be connected absolutely free of leaks.
- If the charge pressure is measured during a drive, a second person is necessary to operate the turbocharger tester for reasons of safety.
- Observe that the pressure hose is not trapped between the hood and the body.
- Measure charge pressure at wide open throttle:
- Accelerate vehicle in 3rd or 2nd gear from 2000 rpm using wide open throttle.
- Press storage key "M" on turbocharger tester at 3000 rpm.
Specification: (absolute pressure):
- Engine code APH: 1.3001.400 bar
- Engine codes BKF, BNU: 1.5001.650 bar
If the charge pressure is exceeded:
- Disconnect connector - 2 - from Wastegate bypass regulator valve -N75- -1 -.
- Check hose from connecting pipe (between turbocharger and charge air cooler) via valve to pressure unit for continuity.
- Check pressure unit (for charge pressure control valve) for secure seat on turbocharger.
- Check shaft bearing for charge pressure control valve in turbocharger for ease of operation. If rusted in place, replace turbocharger.
If there is no fault or the charge pressure is not reached:
- Check Wastegate bypass regulator valve -N75-.
Engine codes AWP, AWV
Test charge pressure control with Vehicle diagnosis, Testing and Information system VAS 5051 in "guided fault finding" Adapting functions and components. Programming and Relearning