Subaru Impreza 2003 Service Manual page 873

15.General Diagnostic Table
A: INSPECTION
NOTE:
• Malfunction of parts other than those listed is also possible.
• The right-hand priority column indicates inspection priority of probable causes of the symptom. Carry out
the check starting from A.
Symptom
1. Engine does not start. (Internal combustion does
not occur.)
2. Engine does not start. (Internal combustion
occurs.)
3. Engine does not start. (Engine stalls after internal
combustion.)
4. Engine stalls.
GENERAL DIAGNOSTIC TABLE
1) ECM power supply
2) Engine ground cable
3) Crankshaft position sensor
4) Camshaft position sensor
5) Fuel pump
6) Pressure regulator
7) Ignition coil & ignitor
8) Spark plug
9) Fuel injector
1) ECM power supply
2) Spark plug
3) Engine coolant temperature sensor
4) Pressure regulator
5) Manifold absolute pressure sensor
6) Fuel pump
7) Fuel injector
8) Camshaft position sensor
9) Crankshaft position sensor
10) Idle air control solenoid valve
1) ECM power supply
2) Manifold absolute pressure sensor
3) Engine coolant temperature sensor
4) Spark plug
5) Ignition coil
6) Fuel pump
7) Pressure regulator
8) Fuel injector
9) Idle air control solenoid valve
1) Idle air control solenoid valve
2) Manifold absolute pressure sensor
3) Spark plug
4) Accelerator cable is out of adjustment
5) ECM power supply
6) Throttle position sensor
7) Crankshaft position sensor
8) Vehicle speed sensor
9) Ignition coil
10) Fuel pump
EN(H4SOw/oOBD)-97
ENGINE (DIAGNOSTICS)
Problem parts Priority
A
A
B
B
B
B
C
C
C
A
A
B
B
C
C
C
C
C
C
A
A
B
B
C
C
C
C
C
A
B
B
B
C
C
C
C
C
C