1996 SUBARU LEGACY Chassis

: Connector & terminal
(B54) No. 1 (+)—Chassis ground ():

Is the voltage less than1Vin“D”posi-
tion?

Is the voltage more than6Vinother
positions?
: Go to next.
:Goto.
: Connector & terminal
(B54) No. 2 (+)—Chassis ground ():

Is the voltage less than1Vin“3”posi-
tion?

Is the voltage more than6Vinother
positions?
: Go to next.
:Goto.
: Connector & terminal
(B54) No. 3 (+)—Chassis ground ():

Is the voltage less than1Vin“2”posi-
tion?

Is the voltage more than6Vinother
positions?
: Go to next.
:Goto.
: Connector & terminal
(B54) No. 4 (+)—Chassis ground ():

Is the voltage less than1Vin“1”posi-
tion?

Is the voltage more than6Vinother
positions?
: Repair poor contact in TCM connector.
:Goto.
: Is there poor contact in TCM connector?
: Repair poor contact in TCM connector.
: Replace TCM.
292
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

B2M0589A
10BJ1
CHECK INPUT SIGNAL FOR ECM.
1) Turn ignition switch to ON.
2) Measure voltage between ECM and chassis ground.
: Connector & terminal
(B84) No. 82 (+)—Chassis ground ():
Is the voltage between 4.5 and 5.5 V in neu-
tral position?
: Go to next.
: Go to step10BJ2.
B2M0589A
: Connector & terminal
(B84) No. 82 (+)—Chassis ground ():
Is the voltage less than1Vinother posi-
tions?
: Go to next.
: Go to step10BJ2.
: Is there poor contact in ECM connector?
: Repair poor contact in ECM connector.
: Replace ECM.
OBD0469A
10BJ2
CHECK NEUTRAL POSITION SWITCH.
1) Turn ignition switch to OFF.
2) Disconnect connector from transmission harness.
3) Measure resistance between transmission harness and
connector terminals.
: Connector & terminal
(T2) No. 1—No. 2:
Is the resistance more than 1 MΩin neutral
position?
: Go to next.
: Repair short circuit in transmission harness or
replace neutral position switch.
: Connector & terminal
(T2) No. 1—No. 2:
Is the resistance less than 1Ωin other posi-
tions?
: Go to step10BJ3.
: Repair open circuit in transmission harness or
replace neutral position switch.
316
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

B2M0590A
10BJ3CHECK HARNESS BETWEEN ECM AND
NEUTRAL POSITION SWITCH.
1) Disconnect connector from ECM.
2) Measure resistance of harness between ECM and
transmission harness connector.
: Connector & terminal
(B84) No. 82—(B25) No. 1:
Is the resistance less than 1Ω?
: Go to next step 3).
: Repair open circuit in harness between ECM and
transmission harness connector.
B2M0591A
3) Measure resistance between ECM and chassis ground.
: Connector & terminal
(B84) No. 82—Chassis ground:
Is the resistance less than 10Ω?
: Repair short circuit in harness between ECM and
transmission harness connector.
: Go to next step 4).
OBD0472A
4) Measure resistance of harness between transmission
harness connector and engine ground.
: Connector & terminal
(B25) No. 2—Engine ground:
Is the resistance less than 5Ω?
: Go to next.
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between transmission harness
connector and engine grounding terminal

Poor contact in coupling connector (B22)
: Is there poor contact in transmission har-
ness connector?
: Repair poor contact in transmission harness con-
nector.
: Replace ECM.
317
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

WIRING DIAGRAM:
B2M0592
B2M0593A
10BK1
CHECK INPUT SIGNAL FOR ECM.
1) Turn ignition switch to ON.
2) Measure voltage between ECM and chassis ground.
: Connector & terminal
(B84) No. 82 (+)—Chassis ground ():
Is the voltage less than1Vin“N”and“P”
positions?
: Go to next.
: Go to step10BK2.
B2M0593A
: Connector & terminal
(B84) No. 82 (+)—Chassis ground ():
Is the voltage between 4.5 and 5.5 V in other
positions?
: Go to next.
: Go to step10BK2.
: Is there poor contact in ECM connector?
: Repair poor contact in ECM connector.
: Replace ECM.
319
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

B2M0594A
10BK2CHECK HARNESS BETWEEN ECM AND
INHIBITOR SWITCH.
1) Turn ignition switch to OFF.
2) Disconnect connectors from ECM and transmission.
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 open circuit in harness between ECM and
transmission harness connector.
B2M0595A
4) Measure resistance of harness between ECM and
chassis ground.
: Connector & terminal
(B84) No. 82—Chassis ground:
Is the resistance less than 10Ω?
: Repair short circuit in harness between ECM and
transmission harness connector.
: Go to next step 5).
OBD0479A
5) 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 step10BK3.
: Repair open circuit in inhibitor switch ground line.
320
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

WIRING DIAGRAM:

RHD Model
B2M0786
B2M0596A
10BL1
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 step10BL2.
: Go to step10BL3.
324
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

B2M0596A
10BL2CHECK HARNESS BETWEEN ECM AND
PRESSURE SOURCES SWITCHING
SOLENOID VALVE CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from pressure sources switching
solenoid valve.
3) Turn ignition switch to ON.
4) Measure voltage between ECM and chassis ground.
: Connector & terminal
(B84) No. 15 (+)—Chassis ground ():
Is the voltage more than 10 V?
: Repair short circuit in harness between ECM and
pressure sources switching solenoid valve con-
nector and replace ECM.
: Go to next step 5).
OBD0485
5) Turn ignition switch to OFF.
6) Measure resistance between pressure sources switch-
ing solenoid valve connector terminals.
: Terminals
No. 1—No. 2:
Is the resistance less than 1Ω?
: Replace pressure sources switching solenoid
valve and ECM.
: Go to next.
: Is there poor contact in ECM connector?
: Repair poor contact in ECM connector.
: Replace ECM.
325
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

B2M0599A
10BM1
CHECK INPUT SIGNAL FOR ECM.
1) Turn ignition switch to ON.
2) Measure voltage between ECM and chassis ground.
: Connector & terminal
(B84) No. 79 (+)—Chassis ground ():
Is the voltage more than 4.5 V?
: Go to next.
: Go to step10BM2.
: Is there poor contact in ECM connector?
: Repair poor contact in ECM connector.
: Replace ECM.
B2M0600A
10BM2CHECK HARNESS BETWEEN ECM AND
TCM CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connectors from ECM and TCM.
3) Measure resistance of harness between ECM and TCM
connector.
: Connector & terminal
(B84) No. 79—(B55) No. 16:
Is the resistance less than 1Ω?
: Go to next step 4).
: Repair open circuit in harness between ECM and
TCM connector.
329
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code