1995 Volvo 850 Turbo System Component Tests
Before testing separate components or systems, perform procedures in the F - BASIC TESTING - TURBO article. Since many computer-controlled and monitored components set a trouble code if they malfunction, also see the G - TESTS W/CODES - TURBO article.
NOTE: Testing individual components does not isolate shorts or opens. Unless stated otherwise in test procedure, perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance. Use ohmmeter to isolate wiring harness shorts or opens.
AIR INDUCTION SYSTEMS
TURBOCHARGER
Preliminary Checks
1) Warm engine to normal operating temperature. Turn off engine. If turbine shaft does not stop rotating shortly after engine stops, remove intake hose from compressor housing.
2) Verify compressor wheel rotates freely. Ensure compressor wheel does not scrape against compressor housing when wheel is pushed radially or axially.
Basic Adjustment Of Pressure Regulator Push Rod
1) Remove locking circlip from end of push rod. Connect Pressure Gauge (999-5230) and Pressure Tester (999-5496) to pressure regulator. See Fig. 1. Increase pressure to 1.7-1.9 psi (.12-.13 kg/cm). Press wastegate lever against turbine housing, closing wastegate valve.
2) Adjust push rod length so push rod fits exactly over wastegate valve lever. Install locking circlip, and tighten push rod lock nut. Remove pressure gauge and tester.
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