Subaru XT 1988 Service Manual page 345

2-7 FUEL INJECTION SYSTEM
!
Turn ignition switch ON Check voltage between 2-pole
(engine ofO. connector power terminal
NO
I
Repair open harness.
I
~
---
(BW) at IG coil power tran-
t
sistor and car body is greater
than 10V.
Check if monitor voltage
repeats to become 0 V and 5 V
~
YES
when crankshaft is turned
slowly (do not crank with
NO
I
Replace crank angle
I
Check voltage between IG coil
NO
J Replace IG coil.
I
starter) while monitoring
I
sensor.
1-)
terminal and car body is
voltage between control unit greater than 10 V.
position signal terminalS
c.:..,\oJ
I
!
YES
and car body.
it
,
~
)
~
YES
.-
~
,
,
Disconnect 2-pole connector
at IG coil power transistor.
Check if monitor voltage
!
repeats to become OV and 5V
when crankshaft is turned by
NO .1
Replace crank angle
I
starter while monitoring Check if voltage varies syn-
voltage between control unit
l
sensor.
chronously with engine revolu-
reference signal terminal
tions when cranking while
YES
17 (W) and car body.
monitoring voltage between
J
Replace IG coil.
I
~
YES
2-pole connector signal termi·
nal (WY) at IG coil power
transistor and car body.
Connect 2-pole connector at
IG coil power transistor.
~
NO
1
Repair harness or replace con-
trol unit.
Connect injector connector.
l
Turn ignition switch ON
(engine off).
62