Subaru 2002 IMPREZA Service Manual page 1703

DIAGNOSTIC PROCEDURE FOR NO-DIAGNOSTIC TROUBLE CODE (DTC)
Step
1 CHECK POWER SWITCH OPERATION.
2 CHECK POWER SWITCH OPERATION.
3 CHECK POWER INDICATOR LIGHT.
1)Turn the ignition switch to OFF.
2)Remove the combination meter.
3)Remove the POWER indicator light bulb
from combination meter.
4 CHECK POWER SWITCH GROUND LINE.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from power switch.
3)Measure the resistance of harness connec-
tor between power switch and chassis ground.
Connector & terminal
(B133) No. 4 — Chassis ground:
5 CHECK POWER SWITCH.
1)Turn the power switch to ON.
2)Measure the resistance between terminals of
power switch.
Terminals
No. 5 — No. 4:
6 CHECK POWER SWITCH.
1)Turn the power switch to OFF.
2)Measure the resistance between terminals of
power switch.
Terminals
No. 5 — No. 4:
7 CHECK HARNESS CONNECTOR BETWEEN
TCM AND POWER SWITCH.
Measure the resistance of harness connector
between TCM and power switch.
Connector & terminal
(B55) No. 23 — (B133) No. 3:
8 CHECK HARNESS CONNECTOR BETWEEN
TCM AND POWER SWITCH.
Measure the resistance of harness connector
between TCM and chassis ground.
Connector & terminal
(B55) No. 23 — Chassis ground:
9 CHECK INPUT SIGNAL FOR TCM.
1)Connect the connectors to TCM and power
switch.
2)Turn the ignition switch to ON (engine OFF).
3)Measure the signal voltage for TCM while
turning power switch to OFF.
Connector & terminal
(B55) No. 23 (+) — Chassis ground (–):
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Check
When the power switch is
turned to OFF, does LED light
up?
When the power switch is
turned to ON, does LED light
up?
Is the POWER indicator light
bulb OK?
Is the resistance less than 1
Ω?
Is the resistance less than 1
Ω?
Is the resistance more than 1
MΩ?
Is the resistance less than 1
Ω?
Is the resistance more than 1
MΩ?
Is the voltage more than 10 V? Go to step 10.
AT-117
Yes
Go to step 5. Go to step 2.
Go to step CHECK Go to step 3.
INHIBITOR
SWITCH. <Ref. to
AT-119, CHECK
INHIBITOR
SWITCH., Diag-
nostic Procedure
for No-diagnostic
Trouble Code
(DTC).>
Go to step 4. Replace the
POWER indicator
light bulb. <Ref. to
IDI-15, Combina-
tion Meter Assem-
bly.>
Go to step 5. Repair the open
circuit in harness
between power
switch and chassis
ground.
Go to step 6. Repair the power
switch.
Go to step 7. Repair the power
switch.
Go to step 8. Repair the open
circuit in harness
between TCM and
power switch con-
nector.
Go to step 9. Repair the short
circuit in harness
between TCM and
power switch con-
nector.
Replace the TCM.
<Ref. to AT-46,
Transmission Con-
trol Module
(TCM).>
No