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| Pull off vacuum hose between intake manifold and overrun shut-off valve at intake manifold and connect using T-piece of turbocharger tester -V.A.G 1397A-. |
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| Select measuring range l. |
Note | t
| The hoses must be connected so that there is no possibility of leaks. |
| t
| If charge pressure is measured whilst driving, it is necessary for safety reasons, for a second person to operate the turbocharger tester. |
| t
| Ensure that the pressure hose is not trapped between the bonnet and the body. |
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| Measuring charge pressure at full throttle: accelerate with full throttle from 2,000 rpm in 3rd gear or in 2nd driving range. |
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| At 3000 rpm, press the memory button “M” on turbocharger tester. Specification: (absolute pressure): 1.300 ... 1.400 bar |
| If the charge pressure is exceeded: |
| –
| Check charge pressure control solenoid valve -N75-. (Hose from turbocharger via valve to vacuum unit not blocked when connector is pulled off). |
| –
| Check that vacuum unit for charge pressure control valve is securely mounted on turbocharger. |
| –
| Check charge pressure regulating valve shaft mounting in turbocharger for ease of movement. If corroded (seized), renew turbocharger. |
| If the charge pressure is not attained: |
| –
| Check charge pressure control solenoid valve -N75- → Chapter. |
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