Turbocharger and Boost Pressure Regulator Valve, Checking

Turbocharger and boost pressure regulator valve, checking

Special tools and equipment





^ VAG1397A





^ VAS5051 with VAG5051/1

or

^ VAG1551 with VAG1551/3A

Test requirements
^ All hoses and wires have been checked for proper seating and seal
^ DTC memory checked

^ Output Diagnostic Test Mode (DTM) performed
^ Vehicle tester VAS5051 or VAG1551 connected.

Test sequence

WARNING! To reduce the risk of accident or injury while carrying out tests and measurements during a road test, observe safety precautions.





^ Using T-piece connect test hose from VAG1397A Turbocharger Tester between intake manifold and fuel pressure regulator.
^ Guide test hose over rear corner of hood, through passenger side window and into vehicle interior.





^ Turn turbocharger tester on and select measuring range -I- (absolute pressure).
^ Connect test hose to connection barb

Notes:
^ Hoses must be properly connected and there must be no possibility of leaks, otherwise incorrect readings may result.
^ Make sure that the test hose is not pinched at the hood or at the side window.
^ By pressing memory button "M" on turbocharger tester, the last test value is saved until either memory button "M" is pressed again or the turbocharger tester is shut-off
^ A blinking comma in the display field indicates that a value has been saved.
^ An arrow appears in the top left comer of the display field if the turbocharger tester battery voltage drops below the permitted threshold.
^ Before testing, drive vehicle rapidly for at least 3 km on a road that does not require stopping (i.e. traffic lights or similar).
^ A second technician is required because the indicated values must be read out while the vehicle is being driven.





When indicated on display:
^ Press buttons -0- and -8- to select "Read Measuring Value Block" and press -Q- button to confirm input.





When indicated on display:
^ Press buttons -0-, -0- and -4- to select "display group number 004" and press -Q- button to confirm input.





Indicated on display
^ Do not continue with test until intake air temperature in display field 4 is 20 - 50°C if necessary, warm up vehicle by driving.
^ Press -C- button.





When indicated on display:
^ Press buttons -1-, -1- and -5-to select "display group number 115" and press -Q- button to confirm input.





Indicated on display (1-4 = display fields)
^ Accelerate vehicle in 3rd gear at full throttle from 2000 RPM and observe tachometer.
^ At approximately 3000 RPM, press the print button on the VAS5051 or VAG1551 and simultaneously press the memory button -M- on the VAG1397A.

Note: The height of the boost pressure should be determined using the VAG 139 71A turbocharger test tool, the VAS5051 tester or the VAG1551 Scan Tool is used to determine whether the boost pressure is also being recognized in the control module.





^ Specification on VAG1397A: 1.450 - 1.700 bar





- Specified value on VAS5051 or VAG1551 Display field 4: 1450 - 1700 mbar

If the specification is exceeded or not met:
^ Check DTC memory of Engine Control Module (ECM)








Boost pressure regulation Diagnostic Trouble Codes (DTC)