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HOMESERVICE MANUALSSUBARU1991JUSTY GL, 2D HATCHBACK, 1.2 7, AUTOMATIC CVTREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSTURBOCHARGER COMPONENT TESTINGBOOST PRESSURE TESTING
1991 Subaru Justy GL, 2D Hatchback, 1.2 7, Automatic CVT

Boost Pressure Testing

1991 Subaru Justy GL, 2D Hatchback, 1.2 7, Automatic CVTSECTION Boost Pressure Testing
  1. Disconnect wastegate duty solenoid connector. Engine must be at normal operating temperature. Disconnect rubber hose from pressure switch. Using a "T" fitting, connect an air pressure gauge. Use enough hose so that gauge may be carried inside passenger compartment.
  2. Boost pressure should be checked at 2400 RPM with a wide open throttle. Normal pressure is 14.5-17 in Hg. (7.3-8.3 psi). Reconnect wastegate duty solenoid.
  3. If boost pressure is too high, check the rubber hose that connects the intake manifold to the wastegate valve. Replace if defective. If wastegate valve is not operating and remains closed, replace the turbocharger. If boost pressure is too low, replace the turbocharger.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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