Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Legacy 1995-1999 Approved Subaru Legacy 1998 1998 Service Manual DIAGNOSTICS SECTION ON-BOARD DIAGNOSTICS II SYSTEM MSA5TCD98L21320
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2-7 [T9A0] ON-BORAD DIAGNOSTICS II SYSTEM 9. General Diagnostic Table 9. General Diagnostic Table A: GENERAL DIAGNOSTICS TABLE WITH NON-CONFORMITY SYMPTOM FOR ENGINE NOTE: Malfunction of parts other than those listed is also possible.or Symptom Problem parts 1) Idle air control solenoid valve 2) Mass air flow sensor 3) Ignition parts (*1) 4) Engine coolant temperature sensor (*2) 1. Engine stalls during idling. 5) Crankshaft position sensor (*3) 6) Camshaft position sensor (*3) 7) EGR valve 8) Fuel injection parts (*4) 1) Idle air control solenoid valve 2) Mass air flow sensor 3) Engine coolant temperature sensor (*2) 4) Ignition parts (*1) 5) Air intake system (*5) 6) Fuel injection parts (*4) 2. Rough idling 7) Throttle position sensor 8) Crankshaft position sensor (*3) 9) Camshaft position sensor (*3) 10) EGR valve 11) Oxygen sensor 12) Fuel pump and fuel pump relay 1) Idle air control solenoid valve 2) Engine coolant temperature sensor 3. Engine does not return to idle. 3) Accelerator cable (*6) 4) Throttle position sensor 5) Mass air flow sensor 1) Mass air flow sensor 2) Throttle position sensor 3) Fuel injection parts (*4) 4) Fuel pump and fuel pump relay 5) Engine coolant temperature sensor (*2) 4. Poor acceleration 6) Crankshaft position sensor (*3) 7) Camshaft position sensor (*3) 8) A/C switch and A/C cut relay 9) Engine torque control signal circuit 10) Ignition parts (*1) 1) Mass air flow sensor 2) Engine coolant temperature sensor (*2) 3) Crankshaft position sensor (*3) 4) Camshaft position sensor (*3) 5. Engine stalls or engine sags or hesitates at 5) Purge control solenoid valve acceleration. 6) EGR valve 7) Fuel injection parts (*4) 8) Throttle position sensor 9) Fuel pump and fuel pump relay 1) Mass air flow sensor 2) Engine coolant temperature sensor (*2) 3) Crankshaft position sensor (*3) 4) Camshaft position sensor (*3) 6. Surge 5) EGR valve 6) Fuel injection parts (*4) 7) Throttle position sensor 8) Fuel pump and fuel pump relay 114 ON-BORAD DIAGNOSTICS II SYSTEM [T9B0] 2-7 9. General Diagnostic Table Symptom Problem parts 1) Mass air flow sensor 2) Engine coolant temperature sensor 7. Spark knock 3) Knock sensor 4) Fuel injection parts (*4) 5) Fuel pump and fuel pump relay 1) Mass air flow sensor 2) Engine coolant temperature sensor (*2) 8. After burning in exhaust system 3) Fuel injection parts (*4) 4) Fuel pump and fuel pump relay *1: Check ignitor, ignition coil and spark plug. *2: Indicate the symptom occurring only in cold temperatures. *3: Ensure the secure installation. *4: Check fuel injector, fuel pressure regulator and fuel filter. *5: Inspect air leak in air intake system. *6: Adjust accelerator cable. B: GENERAL DIAGNOSTICS TABLE WITH NON-CONFORMITY SYMPTOM FOR AUTOMATIC TRANSMISSION NOTE: Check general diagnostics table with non-conformity symptom for automatic transmission. 115
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