Subaru 2002 IMPREZA Service Manual page 1641

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
14 CHECK INPUT SIGNAL FOR TCM USING
SUBARU SELECT MONITOR.
1)Connect the connectors to TCM, throttle
position sensor and ECM.
2)Connect the Subaru Select Monitor to data
link connector.
3)Turn the ignition switch to ON (engine OFF).
4)Turn the Subaru Select Monitor switch to
ON.
5)Throttle fully closed.
6)Read the data of throttle position sensor
using Subaru Select Monitor.
•Throttle position sensor input signal is indi-
cated.
15 CHECK INPUT SIGNAL FOR TCM USING
SUBARU SELECT MONITOR.
Throttle fully open.
NOTE:
Must be changed correspondingly with the ac-
celerator pedal operation (from "released" to
"depressed" position).
16 CHECK INPUT SIGNAL FOR TCM (THROT-
TLE POSITION SENSOR POWER SUPPLY).
Measure the voltage between TCM connector
and chassis ground.
Connector & terminal
(B54) No. 2 (+) — Chassis ground ( − − − − ):
17 CHECK INPUT SIGNAL FOR TCM USING
SUBARU SELECT MONITOR (THROTTLE
POSITION SENSOR POWER SUPPLY).
Read the data of throttle position sensor power
supply using Subaru Select Monitor.
•Throttle position sensor power supply voltage
is indicated.
18 CHECK POOR CONTACT.
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Check
Is the value voltage between
0.2 and 1.0 V?
Is the value voltage between
4.2 and 4.7 V?
Is the voltage between 4.8 and
5.3 V?
Is the value voltage between
4.8 and 5.3 V?
Is there poor contact in throttle
position sensor circuit?
AT-55
Yes
Go to step 15. Go to step 18.
Go to step 18. Go to step 17.
Even if the Go to step 18.
POWER indicator
lights up, the cir-
cuit has returned
to a normal condi-
tion at this time. A
temporary poor
contact of the con-
nector or harness
may be the cause.
Repair the har-
ness or connector
in throttle position
sensor circuit.
Even if the Go to step 18.
POWER indicator
lights up, the cir-
cuit has returned
to a normal condi-
tion at this time. A
temporary poor
contact of the con-
nector or harness
may be the cause.
Repair the har-
ness or connector
in throttle position
sensor circuit.
Repair the poor Replace the TCM.
contact. <Ref. to AT-46,
Transmission Con-
trol Module
(TCM).>
No