Subaru 2002 IMPREZA Service Manual page 1228

DIAGNOSTICS FOR ENGINE STARTING FAILURE
ENGINE (DIAGNOSTICS)
Step
3 CHECK POWER SUPPLY CIRCUIT FOR IG-
NITION COIL & IGNITOR ASSEMBLY.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from ignition coil &
ignitor assembly.
3)Turn the ignition switch to ON.
4)Measure the power supply voltage between
ignition coil & ignitor assembly connector and
engine ground.
Connector & terminal
(E31) No. 3 (+) — Engine ground ( − − − − ):
(E32) No. 3 (+) — Engine ground ( − − − − ):
(E33) No. 3 (+) — Engine ground ( − − − − ):
(E34) No. 3 (+) — Engine ground ( − − − − ):
4 CHECK HARNESS OF IGNITION COIL & IG-
NITOR ASSEMBLY GROUND CIRCUIT.
1)Turn the ignition switch to OFF.
2)Measure the resistance between ignition coil
& ignitor assembly connector and engine
ground.
Connector & terminal
(E31) No. 2 — Engine ground:
(E32) No. 2 — Engine ground:
(E33) No. 2 — Engine ground:
(E34) No. 2 — Engine ground:
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 con-
nector.
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:
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:
7 CHECK POOR CONTACT.
Check poor contact in ECM connector.
Check
Is the voltage more than 10 V? Go to step 4.
Is the resistance between less
than 5 Ω?
Is the resistance less than 1
Ω?
Is the resistance more than 1
MΩ?
Is there poor contact in ECM
connector?
EN(TURBO)-68
Yes
Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
ignition coil & igni-
tor assembly, and
ignition switch
connector
• Poor contact in
coupling connec-
tors
Go to step 5. Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
ignition coil & igni-
tor assembly con-
nector and engine
grounding terminal
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