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I - SYSTEM/COMPONENT TESTS 1998 Mitsubishi Montero 1998 ENGINE PERFORMANCE Mitsubishi - System & Component Testing Diamante, Eclipse, Galant, Mirage, Montero, Montero Sport, 3000GT INTRODUCTION NOTE: Testing individual components does not isolate shorts or opens. Perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use ohmmeter to isolate wiring harness shorts or opens. Testing procedures not covered in this article require a scan tool. See G - TESTS W/CODES article. Before testing separate components or systems, perform basic diagnostic procedures in F - BASIC TESTING article. Since many computer-controlled and monitored components set a diagnostic trouble code if they malfunction, also perform self-diagnostics in G - TESTS W/CODES article. AIR INDUCTION SYSTEMS TURBOCHARGER Turbocharger Pressure Check 1) Disconnect Black turbocharger pressure control hose at wastegate solenoid valve, and plug valve nipple. Attach pressure gauge to hose. Drive vehicle and accelerate engine, in 2nd gear, to 3500 RPM or more. Check turbocharger pressure when pressure gauge stabilizes. See TURBOCHARGER PRESSURE SPECIFICATIONS table. 2) If pressure gauge reading is more than specified, check wastegate actuator. See DTCs P1103 and P1104 in G - TESTS W/CODES article. Replace wastegate actuator as required. If pressure gauge reading is less than specified, check for malfunctioning wastegate valve, turbocharger pressure leaks and faulty turbocharger. TURBOCHARGER PRESSURE SPECIFICATIONS TABLE Application Pressure psi (kg/cm ) Eclipse ................................ 6.4-14.7 (.4-1.0) 3000GT ................................... 2.9-8.7 (.2-.6) Air By-Pass Valve Remove air by-pass valve. Valve is mounted to intake air duct between air-to-air intercooler and intake plenum. Apply vacuum to diaphragm of vacuum valve. Valve should begin opening at approximately 16 in. Hg. Observe operation of valve through by-pass opening. Wastegate Actuator Test Actuator is mounted on turbocharger. For testing procedures, see DTCs P1103 and P1104 in G - TESTS W/CODES article. Wastegate Control Solenoid Valve Test On Eclipse, valve is mounted to top back section of air cleaner. On 3000GT, valve is mounted to firewall, beside EGR solenoid. |