Subaru IMPREZA 2004 Service Manual page 357

B: ACTIVATION OF MALFUNCTION
INDICATOR LIGHT
1) When the ignition switch is turned to ON (engine
off), the malfunction indicator light (A) in the combi-
nation meter illuminates.
NOTE:
If the malfunction indicator light does not illuminate,
perform diagnostics of the malfunction indicator
light circuit or the combination meter circuit. <Ref.
to EN(H4SO)(diag)-52, MALFUNCTION INDICA-
TOR LIGHT DOES NOT COME ON., Malfunction
Indicator Light.>
(A)
2) After starting the engine, the malfunction indica-
tor light goes out. If it does not, either the engine or
the emission control system is malfunctioning.
a) No trouble
ON
OFF
b) Trouble occurs.
ON
OFF
Ignition
switch
3) If the diagnosis system senses a misfire which
could damage the catalyzer, the malfunction indi-
cator light will blink at a cycle of 1 Hz.
ON
OFF
Ignition
switch
Engine
ON
start
Malfunction Indicator Light
EN-01416
Engine
ON
start
EN-01597
1 sec.
Misfire
start
EN-01598
EN(H4SO)(diag)-51
4) When the ignition switch is turned to ON (engine
off) or to "START" with test mode connector con-
nected, the malfunction indicator light blinks at a
cycle of 3 Hz.
ON
OFF
Ignition
switch
ON
ENGINE (DIAGNOSTICS)
1 sec.
EN-01599