Subaru Legacy 2003 Service Manual page 867

DIAGNOSTICS FOR ENGINE STARTING FAILURE
ENGINE (DIAGNOSTICS)
6 CHECK INPUT SIGNAL FOR IGNITION COIL
& IGNITOR ASSEMBLY.
Check if voltage varies synchronously with
engine speed when cranking, while monitoring
voltage between ignition coil & ignitor assem-
bly connector and engine ground.
Connector & terminal
(E12) No. 1 (+) — Engine ground (–):
Does the measured value exceed the specified
value?
7 CHECK INPUT SIGNAL FOR IGNITION COIL
& IGNITOR ASSEMBLY.
Check if voltage varies synchronously with
engine speed when cranking, while monitoring
voltage between ignition coil & ignitor assem-
bly connector and engine ground.
Connector & terminal
(E12) No. 4 (+) — Engine ground (–):
Does the measured value exceed the specified
value?
8 CHECK HARNESS BETWEEN ECM AND IG-
NITION COIL & IGNITOR ASSEMBLY CON-
NECTOR.
1) Disconnect connector from ECM.
2) Measure resistance of harness between
ECM and ignition coil & ignitor assembly
connector.
Connector & terminal
(B134) No. 26 — (E12) No. 4:
Is the measured value less than the speci-
fied value?
9 CHECK HARNESS BETWEEN ECM AND IG-
NITION COIL & IGNITOR ASSEMBLY CON-
NECTOR.
Measure resistance of harness between ECM
and ignition coil & ignitor assembly connector.
Connector & terminal
(B134) No. 25 — (E12) No. 1:
Is the measured value less than the specified
value?
10 CHECK HARNESS BETWEEN ECM AND IG-
NITION COIL & IGNITOR ASSEMBLY CON-
NECTOR.
Measure resistance of harness between ECM
and chassis ground.
Connector & terminal:
(B134) No. 26 — Chassis ground:
Does the measured value exceed the specified
value?
Step
EN(H4SOw/oOBD)-48
Value
10 V
10 V
1 Ω
1 Ω
1 MΩ
Yes
Go to step 7. Replace ignition
coil & ignitor
assembly.
Go to step 8. Replace ignition
coil & ignitor
assembly.
Go to step 9. Repair harness
and connector.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
ECM and ignition
coil & ignitor
assembly connec-
tor
• Poor contact in
a coupling connec-
tor (B22)
Go to step 10. Repair harness
and connector.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
ECM and ignition
coil & ignitor
assembly connec-
tor
• Poor contact in
a coupling connec-
tor (B22)
Go to step 11. Repair ground
short circuit in har-
ness between
ECM and ignition
coil & ignitor
assembly connec-
tor.
No