SUBARU LEGACY 1997 Service Repair Manual

10BD1
CHECK DTC P0505 ON DISPLAY.
: Does the Subaru select monitor or OBD-II
general scan tool indicate DTC P0505?
: Inspect DTC P0505 using“10. Diagnostics Chart
with Trouble Code”. <Ref. to 2-7 [T10A0].>
NOTE:
In this case, it is not necessary to inspect DTC P0506.
: Go to step10BD2.
10BD2
CHECK AIR INTAKE SYSTEM.
1) Turn ignition switch to ON.
2) Start engine, and idle it.
: Is clogging the by-pass line between by-
pass hose and intake duct?
: Repair the by-pass line.
: Replace idle air control solenoid valve.
290
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

B2M1105
BE: DTC P0507
—IDLE CONTROL SYSTEM RPM HIGHER
THAN EXPECTED—
DTC DETECTING CONDITION:

Two consecutive driving cycles with fault
TROUBLE SYMPTOM:

Engine keeps running at higher revolution than specified
idling revolution.
WIRING DIAGRAM:
B2M1311
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
<Ref. to 2-7 [T3D0] and [T3E0].>
291
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

10BE1
CHECK DTC P0505 ON DISPLAY.
: Does the Subaru select monitor or OBD-II
general scan tool indicate DTC P0505?
: Inspect DTC P0505 using“10. Diagnostics Chart
with Trouble Code”. <Ref. to 2-7 [T10A0].>
NOTE:
In this case, it is not necessary to inspect DTC P0507.
: Go to step10BE2.
10BE2
CHECK AIR INTAKE SYSTEM.
1) Turn ignition switch to ON.
2) Start engine, and idle it.
: Is there a fault in air intake system?
NOTE:
Check the following items.

Loose installation of intake manifold, idle air control sole-
noid valve and throttle body

Cracks of intake manifold gasket, idle air control sole-
noid valve gasket and throttle body gasket

Loose connections and cracks of idle air control solenoid
valve by-pass hoses

Disconnections of vacuum hoses
: Repair air suction and leaks.
: Replace idle air control solenoid valve.
292
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

BF: DTC P0600
—SERIAL COMMUNICATION LINK
MALFUNCTION—
DTC DETECTING CONDITION:

Two consecutive driving cycles with fault
WIRING DIAGRAM:
B2M1312
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
<Ref. to 2-7 [T3D0] and [T3E0].>
293
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

B2M0582A
10BF1CHECK HARNESS BETWEEN ECM AND
DATA LINK CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM.
3) Measure resistance of harness between ECM and data
link connector (for Subaru Select Monitor & OBD-II general
scan tool).
: Connector & terminal
(B84) No. 93—(B40) No. 10:
Is the resistance less than 1Ω?
: Go to next step 4).
: Repair open circuit in harness between ECM and
data link connector.
B2M0583A
4) Measure resistance of harness between ECM and
chassis ground.
: Connector & terminal
(B84) No. 93—Chassis ground:
Is the resistance less than 10Ω?
: Repair ground short circuit in harness between
ECM and data link connector.
: Repair poor contact in ECM connector and data
link connector.
294
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

OBD0376
BG: DTC P0601
—INTERNAL CONTROL MODULE MEMORY
CHECK SUM ERROR—
DTC DETECTING CONDITION:

Two consecutive driving cycles with fault
TROUBLE SYMPTOM:

Engine does not start.

Engine stalls.
WIRING DIAGRAM:
B2M0519
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
<Ref. to 2-7 [T3D0] and [T3E0].>
10BG1
CHECK DTC P0601 ON DISPLAY.
: Does the Subaru select monitor or OBD-II
general scan tool indicate DTC P0601?
: Replace ECM.
: It is not necessary to inspect DTC P0601.
295
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

B2M0655
BH: DTC P0703
—BRAKE SWITCH INPUT MALFUNCTION—
DTC DETECTING CONDITION:

Two consecutive driving cycles with fault
WIRING DIAGRAM:
B2M1315
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
<Ref. to 2-7 [T3D0] and [T3E0].>
296
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

10BH1
CHECK OPERATION OF BRAKE LIGHT.
: Does brake light come on when depressing
the brake pedal?
: Go to step10BH2.
: Repair or replace brake light circuit.
OBD0589A
10BH2CHECK HARNESS BETWEEN TCM AND
BRAKE LIGHT SWITCH CONNECTOR.
1) Disconnect connectors from TCM and brake light
switch.
2) Measure resistance of harness between TCM and
brake light switch connector.
: Connector & terminal
(B56) No. 7—(B64) No. 2:
(B56) No. 7—(B65) No. 3 (With cruise con-
trol):
(B56) No. 7—(B67) No. 2 (With traction
control):
Is the resistance less than 1Ω?
: Go to next step 3).
: Repair or replace harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between TCM and brake light
switch connector

Poor contact in TCM connector

Poor contact in brake light switch connector
OBD0590A
3) Measure resistance of harness between TCM and
chassis ground.
: Connector & terminal
(B56) No. 7—Chassis ground:
Is the resistance more than 1 MΩ?
: Go to step10BH3.
: Repair ground short circuit in harness between
TCM and brake light switch connector.
297
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

OBD0588A
10BH3
CHECK INPUT SIGNAL FOR TCM.
1) Connect connectors to TCM and brake light switch.
2) Measure voltage between TCM and chassis ground.
: Connector & terminal
(B56) No. 7 (+)—Chassis ground ():
Is the voltage less than 1 V when releasing
the brake pedal?
: Go to next.
: Adjust or replace brake light switch.
OBD0588A
: Connector & terminal
(B56) No. 7 (+)—Chassis ground ():
Is the voltage more than 10 V when
depressing the brake pedal?
: Go to next.
: Adjust or replace brake light switch.
: Is there poor contact in TCM connector?
: Repair poor contact in TCM connector.
: Replace TCM.
298
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

B2M0656
BI: DTC P0705
—TRANSMISSION RANGE SENSOR CIRCUIT
MALFUNCTION—
DTC DETECTING CONDITION:

Two consecutive driving cycles with fault
TROUBLE SYMPTOM:

Starter does not rotate when selector lever is in“P”or
“N”range.

Starter rotates when selector lever is in“R”,“D”,“3”,“2”
or“1”range.

Engine brake is not effected when selector lever is in“3”
range.

Shift characteristics are erroneous.
WIRING DIAGRAM:
B2M1106
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
<Ref. to 2-7 [T3D0] and [T3E0].>
299
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles