Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Forester 1999-2004 Approved Subaru Forester 2004 2 - Engine Section (H4SO) Engine (Diagnostics) General Diagnostic Table
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GENERAL DIAGNOSTIC TABLE
ENGINE (DIAGNOSTICS)
20.General Diagnostic Table
A: INSPECTION
1. ENGINE
NOTE:
Malfunction of parts other than those listed is also possible.
Symptom Problem parts
1) Idle air control solenoid valve
2) Manifold absolute pressure sensor
3) Intake air 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) Idle air control solenoid valve
2) Manifold absolute pressure sensor
3) Intake air temperature sensor
4) Engine coolant temperature sensor (*2)
5) Ignition parts (*1)
6) Air intake system (*5)
2. Rough idling
7) Fuel injection parts (*4)
8) Throttle position sensor
9) Crankshaft position sensor (*3)
10) Camshaft position sensor (*3)
11) Oxygen sensor
12) Fuel pump and fuel pump relay
1) Idle air control solenoid valve
2) Engine coolant temperature sensor
3) Accelerator cable (*6)
3. Engine does not return to idle.
4) Throttle position sensor
5) Manifold absolute pressure sensor
6) Intake air temperature sensor
1) Manifold absolute pressure sensor
2) Intake air temperature sensor
3) Throttle position sensor
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) Intake air temperature sensor
3) Engine coolant temperature sensor (*2)
4) Crankshaft position sensor (*3)
5. Engine stalls or engine sags or hesitates at
5) Camshaft position sensor (*3)
acceleration.
6) Purge control solenoid valve
7) Fuel injection parts (*4)
8) Throttle position sensor
9) Fuel pump and fuel pump relay
EN(H4SO)-323
GENERAL DIAGNOSTIC TABLE
ENGINE (DIAGNOSTICS)
Symptom Problem parts
1) Intake manifold pressure sensor
2) Intake air temperature sensor
3) Manifold absolute pressure sensor
4) Engine coolant temperature sensor (*2)
6. Surge 5) Crankshaft position sensor (*3)
6) Camshaft position sensor (*3)
7) Fuel injection parts (*4)
8) Throttle position sensor
9) Fuel pump and fuel pump relay
1) Intake manifold pressure sensor
2) Intake air temperature sensor
3) Manifold absolute pressure sensor
7. Spark knock 4) Engine coolant temperature sensor
5) Knock sensor
6) Fuel injection parts (*4)
7) Fuel pump and fuel pump relay
1) Intake manifold pressure sensor
2) Intake air temperature sensor
3) Manifold absolute pressure sensor
8. After burning in exhaust system
4) Engine coolant temperature sensor (*2)
5) Fuel injection parts (*4)
6) 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.
*6: Adjust accelerator cable.
2. AUTOMATIC TRANSMISSION
NOTE:
Check general diagnostics table with non-conformity symptom for automatic transmission.
EN(H4SO)-324
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