Subaru Impreza 2003 Service Manual page 1489

20.General Diagnostic Table
A: INSPECTION
1. ENGINE
NOTE:
Malfunction of parts other than those listed is also possible. <Ref. to ME(H4DOTC)-113, Engine Trouble in
General.>
Symptom
1. Engine stalls during idling.
2. Rough idling
3. Engine does not return to idle.
4. Poor acceleration
5. Engine stalls or engine sags or hesitates at
acceleration.
GENERAL DIAGNOSTIC TABLE
Problem parts
1) Idle air control solenoid valve
2) Manifold absolute pressure sensor
3) Mass air flow and intake temperature sensor
4) Ignition parts (*1)
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) Mass air flow and intake temperature sensor
4) Engine coolant temperature sensor (*2)
5) Ignition parts (*1)
6) Air intake system (*5)
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)
4) Throttle position sensor
5) Manifold absolute pressure sensor
6) Mass air flow sensor
1) Manifold absolute pressure sensor
2) Mass air flow and intake temperature sensor
3) Throttle position sensor
4) Fuel injection parts (*4)
5) Fuel pump and fuel pump relay
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)
4) Crankshaft position sensor (*3)
5) Camshaft position sensor (*3)
6) Purge control solenoid valve
7) Fuel injection parts (*4)
8) Throttle position sensor
9) Fuel pump and fuel pump relay
EN(H4DOTC)-313
ENGINE (DIAGNOSTICS)