Turbocharger and Charge Air Pressure Regulating Valve, Checking

Turbocharger And Charge Air Pressure Regulating Valve, Checking

Special tools, testers and auxiliary items required







- V.A.G 1397 A Turbocharger tester







- VAS 5051 Vehicle diagnosis, testing and information system with VAS 5051/1 Adapter
or
- Scan tool V.A.G 1551 with V.A.G 1551/3 A Adapter

Requirements
- All hoses and lines must be securely installed and free of leaks
- DTC memory has been checked
- Output diagnostic test mode has been performed
- Vehicle diagnosis, testing and information system VAS 5051 or scan tool V.A.G 1551 must be connected

Work sequence

WARNING: To avoid any risk of accident, observe the safety precautions when using test instruments while road testing the vehicle







- Connect T-piece and measuring hose of turbocharger tester V.A.G 1397 A to intake manifold (front).
- Route measuring hose under rear edge of hood and into passenger compartment via right side window.







- Switch on turbocharger tester and set measuring range selector switch to position -I- (absolute pressure).
- Connect measuring hose to connection -I-.

NOTE:
- Hose connections must be completely airtight, otherwise measurements will not be correct.
- Ensure that measuring hose is not pinched at hood or side window.
- Pressing memory key M on turbocharger tester will store the last measured value until memory key M is pressed again or the tester is switched off.
- The decimal point in the display flashes to indicate that the value is being stored.
- If the battery voltage of the turbocharger tester drops below the minimum level, an arrow will appear at the top left of the display.
- Before performing the test, drive the vehicle at a brisk speed for at least 3 km (without stopping, e.g. at traffic lights etc.).
- A second technician is required to note the readings on the tester when the vehicle is moving.

Indicated on display:
Rapid data transfer HELP
Select function XX

- Enter "08" to select function "Read Measured Value Block" and confirm entry with -Q- button.

Indicated on display
Read Measured Value Block Q
Enter display group number XXX

- Enter "004" to select display group 004 and confirm entry with -Q- button.

Indicated on display:
Read Measured Value Block 4 ->
1 2 3 4

Do not proceed with the test until the intake air temperature shown in display zone 4 is between 20 and 50 degrees C. If necessary, run the engine until the required temperature is reached.

- Press -C- button.

Indicated on display:
Read Measured Value Block Q
Enter display group number XXX

- Enter "115" to select display group 115 and confirm entry with -Q- button.

Indicated on display (1-4 = display zones)
Read Measured Value Block 115 ->
1 2 3 4

- Accelerate vehicle from 2000 rpm at wide open throttle in third gear, and watch rev counter.
- When engine speed reaches 3000 rpm, press "PRINT" button on VAS 5051 (or V.A.G 1551) and at same time press memory button "M" on V.A.G 1397 A.

NOTE: The charge air pressure should be measured using turbocharger tester V.A.G 13971 A. Vehicle diagnosis, testing and information system VAS 5051 (or scan tool V.A.G 1551) is used to check whether the charge air pressure is being registered by the control module.







- Specification for V.A.G 1397 A: 1.700 - 1.900 bar







- Specification for VAS 5051 or V.A.G 1551: display zone 4 1700-1900 mbar

If the specification is not obtained or is exceeded:
- Check DTC memory of engine control module:

Malfunctions in charge air pressure control function