Subaru Legacy 2003 Service Manual page 920

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
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 (–):
Is the measured value within the specified
value?
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 ( − − − − ):
Is the measured value within the specified
value?
3 CHECK BATTERY TERMINAL.
Turn ignition switch to OFF.
Are the positive and negative battery terminals
tightly clamped?
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 ( − − − − ):
Is the measured value within the specified
value?
5 CHECK POOR CONTACT IN CONNECTORS.
Is there poor contact in connectors between
generator, battery and ECM?
6 CHECK ECM.
1) Connect all connectors.
2) Erase the memory. <Ref. to EN(H4SOw/
oOBD)-28, OPERATION, Clear Memory
Mode.>
3) Perform inspection mode. <Ref. to
EN(H4SOw/oOBD)-26, OPERATION,
Inspection Mode.>
4) Read out the trouble code. <Ref. to
EN(H4SOw/oOBD)-24, OPERATION,
Read Diagnostic Trouble Code (DTC).>
Is the same trouble code (DTC) as in the
current diagnosis still being output?
7 CHECK ANY OTHER TROUBLE CODES AP-
PEARANCE.
Are other trouble codes (DTC) being output?
Value
10.8 V — 16.2 V
10.8 V — 16.2 V
Battery terminal is tightly
clamped.
10.8 V — 16.2 V
There is poor contact.
DTC 85 is displayed.
DTC is displayed.
EN(H4SOw/oOBD)-101
ENGINE (DIAGNOSTICS)
Yes
Go to step 2. Repair generator.
<Ref. to
SC(H4SO)-14,
Generator.>
Go to step 3. Repair generator.
<Ref. to
SC(H4SO)-14,
Generator.>
Go to step 4. Tighten the clamp
of terminal.
Go to step 5. Repair harness
connector
between battery,
main relay and
ECM.
Repair connector. Go to step 6.
Replace genera- Go to step 7.
tor.
Proceed with the A temporary poor
diagnosis corre- contact.
sponding to the
trouble code.
No