Subaru Legacy 2002 Service Manual page 736

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
No.
1 CHECK GENERATOR.
1) Start engine.
2) Idling after warm-up.
3) Measure voltage between generator B ter-
minal and chassis ground.
Terminal
Generator B terminal (+) — Chassis
ground (–):
2 CHECK GENERATOR.
1) Run engine at 5,000 rpm.
2) Measure voltage between generator B ter-
minal and chassis ground.
Terminal
Generator B terminal (+) — Chassis
ground (−):
3 CHECK BATTERY TERMINAL.
Turn ignition switch to OFF.
4 CHECK INPUT VOLTAGE OF ECM.
1) Run the engine at idle.
2) Measure voltage between ECM connector
and chassis ground.
Connector & terminal
(B136) No. 1 (+) — Chassis ground (−):
(B136) No. 2 (+) — Chassis ground (−):
5 CHECK POOR CONTACT IN CONNEC-
TORS.
6 CHECK ECM.
1) Connect all connectors.
2) Erase the memory. <Ref. to EN-45, Clear
Memory Mode.>
3) Perform inspection mode. <Ref. to EN-42,
Inspection Mode.>
4) Read out the trouble code. <Ref. to EN-41,
Read Diagnostic Trouble Code.>
7 CHECK ANY OTHER TROUBLE CODES
APPEARANCE.
Step
Is the voltage more than
16.2 V?
Is the voltage more than
16.2 V?
Are the positive and nega-
tive battery terminals tightly
clamped?
Is the voltage more than
16.2 V?
Is there poor contact in
connectors between
generator, battery and
ECM?
Is the same trouble code
as in the current diagnosis
still being output?
Are other trouble codes
being output?
EN-219
Check Yes
Go to step 2.
Go to step 3.
Go to step 4.
Go to step 5.
Repair connector.
Replace genera-
tor.
Proceed with the
diagnosis corre-
sponding to the
trouble code.
Engine (Diagnostics)
No
Repair generator.
<Ref. to SC-13,
Generator.>
Repair generator.
<Ref. to SC-13,
Generator.>
Tighten the clamp
of terminal.
Repair harness
connector
between battery,
main relay and
ECM.
Go to step 6.
Go to step 7.
A temporary poor
contact.