Subaru LEGACY Service Manual page 58

ENGINE (DIAGNOSTICS)
• KA and KS model
NOTE:
Fuel injection system for KA and KS model is the same as 2.0 L model. Refer to EN(H4SO 2.0) section.
Step
1 CHECK OPTION CODE.
2 CHECK BATTERY.
Check the battery voltage.
3 CHECK OPERATION OF STARTER MOTOR. Does the starter motor oper-
4 CHECK DTC.
5 CHECK INPUT SIGNAL FOR STARTER MO-
TOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from starter
motor.
3) Turn the ignition switch to START.
4) Measure the power supply voltage between
starter motor connector terminal and engine
ground.
Connector & terminal
(B14) No. 1 (+) — Engine ground (
NOTE:
Place the select lever in the "P" or "N" range.
6 CHECK GROUND CIRCUIT OF STARTER
MOTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the ground cable terminal from
starter motor.
3) Measure the resistance of ground cable
between ground cable terminal and engine
ground.
7 CHECK HARNESS BETWEEN BATTERY
AND IGNITION SWITCH CONNECTOR.
1) Disconnect the connector from ignition
switch.
2) Measure the power supply voltage between
ignition switch connector and chassis ground.
Connector & terminal
(B72) No. 3 (+) — Chassis ground (
Diagnostics for Engine Starting Failure
Is the option code EC, EK or
K4?
Is the voltage more than 12 V? Go to step 3.
ate?
Is DTC displayed? <Ref. to
EN(H4SO 2.5)(diag)-33,
OPERATION, Read Diagnostic
Trouble Code (DTC).>
Is the voltage more than 10 V? Go to step 6.
−
):
Is the resistance less than 5
Ω?
Is the voltage more than 10 V? Go to step 8.
−
):
EN(H4SO 2.5)(diag)-56
Check
Go to step 2.
Go to step 4.
Inspect the rele-
vant DTC using
List of Diagnostic
Trouble Code
(DTC). <Ref. to
EN(H4SO
2.5)(diag)-70, List
of Diagnostic Trou-
ble Code (DTC).>
Check the starter
motor. <Ref. to
SC(H4SO 2.0)-6,
Starter.>
Yes No
Refer to EN(H4SO
2.0) section. <Ref.
to EN(H4SO
2.0)(diag)-66, List
of Diagnostic Trou-
ble Code (DTC).>
NOTE:
Fuel injection sys-
tem for KA and KS
model is the same
as 2.0 L model.
Charge or replace
the battery.
Go to step 5.
Repair the poor
contact in ECM
connector.
Go to step 7.
Repair the open
circuit of ground
cable.
Repair the open
circuit in harness
between ignition
switch and bat-
tery, and check
fuse SBF No. 7
and SBF No. 1.