Subaru Legacy 2003 Service Manual page 1985

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
5 CHECK HARNESS BETWEEN ECM AND IG-
NITION COIL & IGNITOR ASSEMBLY CON-
NECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Disconnect the connector from ignition coil
& ignitor assembly.
4) Measure the resistance of harness
between ECM and ignition coil & ignitor
assembly connector.
Connector & terminal
(B136) No. 21 — (E34) No. 1:
(B136) No. 22 — (E33) No. 1:
(B136) No. 23 — (E32) No. 1:
(B136) No. 24 — (E31) No. 1:
Is the measured value less than the speci-
fied value?
6 CHECK HARNESS BETWEEN ECM AND IG-
NITION COIL & IGNITOR ASSEMBLY CON-
NECTOR.
Measure the resistance of harness between
ECM and engine ground.
Connector & terminal:
(B136) No. 21 — Engine ground:
(B136) No. 22 — Engine ground:
(B136) No. 23 — Engine ground:
(B136) No. 24 — Engine ground:
Does the measured value exceed the specified
value?
7 CHECK POOR CONTACT.
Check poor contact in ECM connector.
Is there poor contact in ECM connector?
Step
EN(H4DOSTC)-146
Value
1 Ω
1 MΩ
There is poor contact.
Yes
Go to step 6. Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
ECM and ignition
coil & ignitor
assembly connec-
tor
• Poor contact in
coupling connector
Go to step 7. Repair the ground
short circuit in har-
ness between
ECM and ignition
coil & ignitor
assembly connec-
tor.
Repair the poor Replace the igni-
contact in ECM tion coil and ignitor
connector. assembly.
No