1997 SUBARU LEGACY check engine

10BQ5CHECK VEHICLE SPEED SENSOR 2 CIR-
CUIT.
Check vehicle speed sensor 2 circuit.
: Is there any trouble in vehicle speed sensor
2 circuit?
: Repair or replace vehicle speed sensor 2 circuit.
: Go to step10BQ6.
10BQ6
CHECK ENGINE SPEED INPUT CIRCUIT.
Check engine speed input circuit.
: Is there any trouble in engine speed input
circuit?
: Repair or replace engine speed input circuit.
: Go to step10BQ7.
10BQ7
CHECK INHIBITOR SWITCH CIRCUIT.
Check inhibitor switch circuit.
: Is there any trouble in inhibitor switch cir-
cuit?
: Repair or replace inhibitor switch circuit.
: Go to step10BQ8.
10BQ8
CHECK BRAKE LIGHT SWITCH CIRCUIT.
Check brake light switch circuit.
: Is there any trouble in brake light switch cir-
cuit?
: Repair or replace brake light switch circuit.
: Go to step10BQ9.
319
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

B2M0662
BR: DTC P0743
—TORQUE CONVERTER CLUTCH SYSTEM
(DUTY SOLENOID B) ELECTRICAL—
DTC DETECTING CONDITION:

Two consecutive driving cycles with fault
TROUBLE SYMPTOM:

No lock-up (after engine warm-up)
WIRING DIAGRAM:
OBD0413
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.

10BR1
CHECK DTC P0743 ON DISPLAY.
: Does the Subaru select monitor or OBD-II
general scan tool indicate DTC P0743?
: Check duty solenoid B circuit. [T7B0].>
: It is not necessary to inspect DTC P0743.
321
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

B2M0666
BV: DTC P0760
—SHIFT SOLENOID C (SHIFT SOLENOID 3)
MALFUNCTION—
DTC DETECTING CONDITION:

Two consecutive driving cycles with fault
TROUBLE SYMPTOM:

Ineffective engine brake with selector lever in“3”
WIRING DIAGRAM:
B2M1110
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.

10BV1CHECK ANY OTHER DTC (BESIDES DTC
P0760) ON DISPLAY.
: Is there any other DTC on display?
: Inspect relevant DTC using“10. Diagnostics Chart
with Trouble Code”.
: Go to step10BV2.
325
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

10BV2
CHECK INHIBITOR SWITCH CIRCUIT.
Check inhibitor switch circuit.
: Is there any trouble in inhibitor switch cir-
cuit?
: Repair or replace inhibitor switch circuit.
: Go to step10BV3.
OBD0145A
10BV3
CHECK GEAR POSITION.
1) Turn ignition switch to OFF.
2) Connect the Subaru select monitor to data link connec-
tor.
3) Lift-up or raise the vehicle and support with safety
stands.
CAUTION:
On AWD models, raise all wheels off ground.
4) Start and warm-up the engine and transmission.
H2M1150
5) Subaru select monitor switch to ON.
6) Select AT mode using function key.
Press the function key [/], and change to AT mode.
7) Press the function key [0].
G3M0152
8) Designate mode using function key.
Function mode for AT: F10
OBD0615
9) Move selector lever to“D”and drive the vehicle.
10) Read data on Subaru select monitor.
: Does gear position change according to
throttle position and vehicle speed?
: Go to next.
: Go to step10BV4.
: Is there poor contact in TCM connector?
: Repair poor contact in TCM connector.
: Go to next.
326
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

B2M0667
BW: DTC P0763
—SHIFT SOLENOID C (SHIFT SOLENOID 3)
ELECTRICAL—
DTC DETECTING CONDITION:

Two consecutive driving cycles with fault
TROUBLE SYMPTOM:

Ineffective engine brake with selector lever in“3”
WIRING DIAGRAM:
OBD0452
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.

10BW1
CHECK DTC P0763 ON DISPLAY.
: Does the Subaru select monitor or OBD-II
general scan tool indicate DTC P0763?
: Check shift solenoid 3 circuit.
: It is not necessary to inspect DTC P0763.
328
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

B2M1117A
10BZ5CHECK HARNESS BETWEEN ECM AND
INHIBITOR SWITCH.
1) Turn ignition switch to OFF.
2) Disconnect connectors from ECM and inhibitor switch.
3) Measure resistance of harness between ECM and
inhibitor switch connector.
: Connector & terminal
(B84) No. 82—(T7) No. 1:
Is the resistance less than 1Ω?
: Go to next step 4).
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between ECM and inhibitor
switch connector

Poor contact in coupling connector (B12)

Poor contact in inhibitor switch connector

Poor contact in ECM connector
B2M1118A
4) Measure resistance of harness between inhibitor switch
connector and engine ground.
: Connector & terminal
(T7) No. 2—Engine ground:
Is the resistance less than 5Ω?
: Go to step10BZ6.
: Repair open circuit in inhibitor switch ground line.
337
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

B2M1119
10BZ6
CHECK INHIBITOR SWITCH.
Measure resistance between inhibitor switch connector
receptacle’s terminals.
: Terminals
No. 1—No. 2:
Is the resistance less than 1Ωin“N”and
“P”positions?
: Go to next.
: Replace inhibitor switch.
: Is there any fault in selector cable connec-
tion to inhibitor switch?
: Repair selector cable connection. [W2B2].>
: Replace ECM.
B2M0594A
10BZ7CHECK HARNESS BETWEEN ECM AND
TRANSMISSION HARNESS CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connectors from ECM and transmission
harness connector.
3) Measure resistance of harness between ECM and
transmission harness connector.
: Connector & terminal
(B84) No. 82—(B12) No. 12:
Is the resistance less than 1Ω?
: Go to next step 4).
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between ECM and transmission
harness connector

Poor contact in transmission harness connector

Poor contact in ECM connector
OBD0479A
4) Measure resistance of harness between transmission
harness connector and engine ground.
: Connector & terminal
(B12) No. 11—Engine ground:
Is the resistance less than 5Ω?
: Go to step10BZ8.
: Repair open circuit in inhibitor switch ground line.
338
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

OBD0481
CA: DTC P1102
—PRESSURE SOURCES SWITCHING
SOLENOID VALVE CIRCUIT LOW INPUT—
DTC DETECTING CONDITION:

Two consecutive driving cycles with fault
TROUBLE SYMPTOM:

Erroneous idling

Failure of engine to start
WIRING DIAGRAM:
B2M1308
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODE.

B2M0596A
10CA1
CHECK OUTPUT SIGNAL FROM ECM.
1) Turn ignition switch to ON.
2) Measure voltage between ECM and chassis ground.
: Connector & terminal
(B84) No. 15 (+)—Chassis ground ():
Is the voltage more than 10 V?
: Go to next.
: Go to step10CA2.
: Is there poor contact in ECM connector?
340
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles