Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Forester 1999-2004 Approved Subaru Forester 2004 2 - Engine Section (H4DOTC) ENGINE (DIAGNOSTICS) General Diagnostic Table

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General Diagnostic Table


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                                       GENERAL DIAGNOSTIC TABLE
ENGINE (DIAGNOSTICS)

19.General Diagnostic Table
A: INSPECTION
1. ENGINE
NOTE:
Malfunction of parts other than those listed is also possible. 
Symptom                                            Problem parts
                                                   1) Electric throttle
                                                   2) Manifold absolute pressure sensor
                                                   3) Mass air flow and intake temperature sensor
                                                   4) Ignition parts (*1)
1. Engine stalls during idling.
                                                   5) Engine coolant temperature sensor (*2)
                                                   6) Crankshaft position sensor (*3)
                                                   7) Camshaft position sensor (*3)
                                                   8) Fuel injection parts (*4)
                                                   1) Electric throttle
                                                   2) Manifold absolute pressure sensor
                                                   3) Mass air flow and intake temperature sensor
                                                   4) Engine coolant temperature sensor (*2)
                                                   5) Ignition parts (*1)
2. Rough idling                                    6) Air intake system (*5)
                                                   7) Fuel injection parts (*4)
                                                   8) Crankshaft position sensor (*3)
                                                   9) Camshaft position sensor (*3)
                                                   10) Oxygen sensor
                                                   11) Fuel pump and fuel pump relay
                                                   1) Electric throttle
                                                   2) Engine coolant temperature sensor
3. Engine does not return to idle.
                                                   3) Manifold absolute pressure sensor
                                                   4) Mass air flow sensor
                                                   1) Manifold absolute pressure sensor
                                                   2) Mass air flow and intake temperature sensor
                                                   3) Electric throttle
                                                   4) Fuel injection parts (*4)
                                                   5) Fuel pump and fuel pump relay
 4. Poor acceleration                              6) Engine coolant temperature sensor (*2)
                                                   7) Crankshaft position sensor (*3)
                                                   8) Camshaft position sensor (*3)
                                                   9) A/C switch and A/C cut relay
                                                   10) Engine torque control signal circuit
                                                   11) Ignition parts (*1)
                                                   1) Manifold absolute pressure sensor
                                                   2) Mass air flow and intake temperature sensor
                                                   3) Engine coolant temperature sensor (*2)
5. Engine stalls or engine sags or hesitates at    4) Crankshaft position sensor (*3)
acceleration.                                      5) Camshaft position sensor (*3)
                                                   6) Purge control solenoid valve
                                                   7) Fuel injection parts (*4)
                                                   8) Fuel pump and fuel pump relay
                                                   1) Manifold absolute pressure sensor
                                                   2) Mass air flow and intake temperature sensor
                                                   3) Engine coolant temperature sensor (*2)
                                                   4) Crankshaft position sensor (*3)
6. Surge
                                                   5) Camshaft position sensor (*3)
                                                   6) Fuel injection parts (*4)
                                                   7) Throttle position sensor
                                                   8) Fuel pump and fuel pump relay


                                                  EN(H4DOTC)-384
                                       GENERAL DIAGNOSTIC TABLE
                                                                                                       ENGINE (DIAGNOSTICS)

Symptom                                               Problem parts
                                                      1) Manifold absolute pressure sensor
                                                      2) Mass air flow and intake temperature sensor
                                                      3) Engine coolant temperature sensor
7. Spark knock
                                                      4) Knock sensor
                                                      5) Fuel injection parts (*4)
                                                      6) Fuel pump and fuel pump relay
                                                      1) Manifold absolute pressure sensor
                                                      2) Mass air flow and intake temperature sensor
8. After-burning in exhaust system                    3) Engine coolant temperature sensor (*2)
                                                      4) Fuel injection parts (*4)
                                                      5) Fuel pump and fuel pump relay
  *1: Check ignition coil & ignitor ASSY 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.




                                                   EN(H4DOTC)-385
                       GENERAL DIAGNOSTIC TABLE
ENGINE (DIAGNOSTICS)




                            EN(H4DOTC)-386



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