Subaru Legacy 2003 Service Manual page 2389

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
8 CHECK INPUT SIGNAL FOR TCM USING
OSCILLOSCOPE.
1) Set oscilloscope to TCM connector termi-
nals.
Connector & terminal
Positive probe; (B56) No. 9
Ground; (B55) No. 9
2) Turn ignition switch to ON (engine OFF).
Check signal waveform pattern on oscillo-
scope. <Ref. to AT-20, WAVEFORM, MEA-
SUREMENT, Transmission Control Module
(TCM) I/O Signal.> Is waveform pattern
same as that shown in the figure?
9 CHECK INPUT SIGNAL FOR TCM USING
OSCILLOSCOPE.
1) Set oscilloscope to TCM connector termi-
nals.
Connector & terminal
Positive probe; (B56) No. 18
Ground; (B55) No. 9
2) Turn ignition switch to ON (engine OFF).
Check signal waveform pattern on oscillo-
scope. <Ref. to AT-20, WAVEFORM, MEA-
SUREMENT, Transmission Control Module
(TCM) I/O Signal.> Is waveform pattern
same as that shown in the figure?
10 CHECK POOR CONTACT.
Is there poor contact in TCM?
Step Value
Same wave form as shown in
figure.
Same wave form as shown in
figure.
There is poor contact.
AT-114
Yes
Go to step 9. Repair poor con-
tact in VDCCM.
Go to step 10. Repair poor con-
tact in VDCCM.
Repair poor con- Replace TCM.
tact. <Ref. to AT-76,
Transmission Con-
trol Module
(TCM).>
No