Subaru 2002 IMPREZA Service Manual page 1709

DIAGNOSTIC PROCEDURE FOR NO-DIAGNOSTIC TROUBLE CODE (DTC)
Step
22 CHECK HARNESS CONNECTOR BETWEEN
INHIBITOR SWITCH AND CHASSIS
GROUND.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from inhibitor
switch.
3)Measure the resistance of harness between
inhibitor switch and chassis ground.
Connector & terminal
(T7) No. 5 — Chassis ground:
23 CHECK HARNESS CONNECTOR BETWEEN
TCM AND INHIBITOR SWITCH.
1)Turn the ignition switch to OFF.
2)Disconnect the connectors from TCM and
inhibitor switch.
3)Measure the resistance of harness between
TCM and inhibitor switch connector.
Connector & terminal
(B55) No. 1 — (T7) No. 9
24 CHECK INPUT SIGNAL FOR TCM.
1)Turn the ignition switch to OFF.
2)Connect the connector to TCM and inhibitor
switch.
3)Turn the ignition switch to ON.
4)Measure the voltage between TCM and
chassis ground.
Connector & terminal
(B55) No. 1 (+) — Chassis ground (–):
25 CHECK INPUT SIGNAL FOR TCM.
Measure the voltage between TCM and chas-
sis ground.
Connector & terminal
(B55) No. 1 (+) — Chassis ground (–):
26 CHECK "P" RANGE INDICATOR LIGHT
BULB.
1)Turn the ignition switch to OFF.
2)Remove the combination meter.
3)Remove the "P" range indicator light bulb
from combination meter.
27 CHECK HARNESS CONNECTOR BETWEEN
TCM AND COMBINATION METER.
1)Disconnect the connectors from TCM and
combination meter.
2)Measure the resistance of harness between
TCM and combination meter.
Connector & terminal
(B55) No. 1 — (i12) No. 14:
28 CHECK HARNESS CONNECTOR BETWEEN
TCM AND INHIBITOR SWITCH.
1)Turn the ignition switch to OFF.
2)Disconnect the connectors from TCM, inhibi-
tor switch and combination meter.
3)Measure the resistance of harness between
TCM and chassis ground.
Connector & terminal
(B55) No. 1 — Chassis ground:
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Check
Is the resistance less than 1
Ω?
Is the resistance less than 1
Ω?
Is the voltage less than 1 V in
"P" range?
Is the voltage more than 8 V in
other ranges?
Is the "P" range indicator light
bulb OK?
Is the resistance more than 1
Ω?
Is the resistance less than 1
MΩ?
AT-123
Yes
Go to step 23. Repair the open
circuit in harness
between inhibitor
switch connector
and chassis
ground, and poor
contact in cou-
pling connector.
Go to step 24. Repair the open
circuit in harness
between TCM and
inhibitor switch
connector, and
poor contact in
coupling connec-
tor.
Go to step 25. Go to step 65.
Go to step 65. Replace the TCM.
<Ref. to AT-46,
Transmission Con-
trol Module
(TCM).>
Go to step 27. Replace the "P"
range indicator
light bulb. <Ref. to
IDI-15, Combina-
tion Meter Assem-
bly.>
Go to step 65. Repair the open
circuit in harness
between TCM
connector and
combination
meter, and poor
contact in cou-
pling connector.
Go to step 29. Repair the ground
short circuit in "P"
range circuit.
No