Subaru Legacy 2002 Service Manual page 589

DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics)
No.
8 CHECK HARNESS BETWEEN ECM AND
IGNITION COIL & IGNITOR ASSEMBLY
CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM.
3) Disconnect connector from ignition coil &
ignitor assembly.
4) Measure resistance of harness between
ECM and ignition coil & ignitor assembly con-
nector.
Connector & terminal
(B134) No. 25 — (E12) No. 1:
9 CHECK HARNESS BETWEEN ECM AND
IGNITION COIL & IGNITOR ASSEMBLY
CONNECTOR.
Measure resistance of harness between ECM
and ignition coil & ignitor assembly connector.
Connector & terminal
(B134) No. 26 — (E12) No. 4:
10 CHECK HARNESS BETWEEN ECM AND
IGNITION COIL & IGNITOR ASSEMBLY
CONNECTOR.
Measure resistance of harness between ECM
and engine ground.
Connector & terminal:
(B134) No. 25 — Engine ground:
11 CHECK HARNESS BETWEEN ECM AND
IGNITION COIL & IGNITOR ASSEMBLY
CONNECTOR.
Measure resistance of harness between ECM
and engine ground.
Connector & terminal
(B134) No. 26 — Engine ground:
12 CHECK POOR CONTACT.
Check poor contact in ECM connector.
Step
Is the resistance less than
1 Ω?
Is the resistance less than
1 Ω?
Is the resistance more than
1 MΩ?
Is the resistance more than
1 MΩ?
Is there poor contact in
ECM connector?
EN-72
Check Yes
Go to step 9.
Go to step 10.
Go to step 11.
Go to step 12.
Repair poor con-
tact in ECM con-
nector.
No
Repair harness
and connector.
NOTE:
In this case,
repair the follow-
ing:
¼ Open circuit in
harness between
ECM and ignition
coil & ignitor
assembly connec-
tor
¼ Poor contact in
coupling connec-
tor (B22)
Repair harness
and connector.
NOTE:
In this case,
repair the follow-
ing:
¼ Open circuit in
harness between
ECM and ignition
coil & ignitor
assembly connec-
tor
¼ Poor contact in
coupling connec-
tor (B22)
Repair ground
short circuit in
harness between
ECM and ignition
coil & ignitor
assembly connec-
tor.
Repair ground
short circuit in
harness between
ECM and ignition
coil & ignitor
assembly connec-
tor.
Check fuel pump
circuit. <Ref. to
EN-74, FUEL
PUMP CIRCUIT,
Diagnostics for
Engine Starting
Failure.>