Subaru Legacy III (2000-2003 year). Service manual — part 595
AT-114
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
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?
Same wave form as shown in
figure.
Repair poor con-
tact in VDCCM.
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?
Same wave form as shown in
figure.
Repair poor con-
tact in VDCCM.
10
CHECK POOR CONTACT.
Is there poor contact in TCM?
There is poor contact.
Repair poor con-
tact.
Replace TCM.
<Ref. to AT-76,
Transmission Con-
trol Module
(TCM).>
Step
Value
Yes
No
AT-115
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
MEMO:
AT-116
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
S: DTC 93 REAR VEHICLE SPEED SENSOR
DIAGNOSIS:
Input signal circuit of TCM is open or shorted.
TROUBLE SYMPTOM:
No lock-up or excessive tight corner “braking”.
WIRING DIAGRAM:
AT-00785
19
20
B24
A19
B11
T4
TCM
B54
A:
B55
B:
NT
TB
7
8
9
SHIELD AND
SENSOR GROUND
JOINT CONNECTOR
REAR VEHICLE
B55
B11
SPEED SENSOR
B54
1 2
5
6 7
8
13
14 15
16
9 10
11 12
3 4
17 18
19 20
1 2 3 4
10 11 12
19 20 21
13
5 6
14 15
7
8
9
16
17
18
22
23
24
1 2 3 4
10 11 12
19 20 21
13
5 6
14 15
7
8
9
16
17
18
22
23
24
1 2 3 4 5 6 7 8 9 10 11 12
B53
B300
1 2 3 4 5 6
: NT
: TB
B53
B330
: NT
: TB
1
2
3
: NON-TURBO MODEL
NT
: TURBO MODEL
TB
AT-117
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
1) Turn ignition switch to OFF.
2) Disconnect connector from TCM and trans-
mission.
3) Measure resistance of harness between
TCM and transmission connector.
Connector & terminal
(B55) No. 24 — (B11) No. 19:
Is the measured value less than the speci-
fied value?
1
Ω
Repair open circuit
in harness
between TCM and
transmission con-
nector.
2
CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
Measure resistance of harness between TCM
and transmission connector.
Connector & terminal
(B54) No. 19 — (B11) No. 20:
Is the measured value less than the specified
value?
1
Ω
Repair open circuit
in harness
between TCM and
transmission, and
poor contact in
coupling connec-
tor.
3
CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
Measure resistance of harness between TCM
and chassis ground.
Connector & terminal
(B55) No. 24 — Chassis ground:
Does the measured value exceed the specified
value?
1 M
Ω
Repair short circuit
in harness
between TCM and
transmission con-
nector.
4
CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
Measure resistance of harness between TCM
and chassis ground.
Connector & terminal
(B54) No. 19 — Chassis ground:
Does the measured value exceed the specified
value?
1 M
Ω
Repair short circuit
in harness
between TCM and
transmission con-
nector.
5
CHECK REAR VEHICLE SPEED SENSOR.
Measure resistance between transmission
connector receptacle's terminals.
Connector & terminal
(T4) No. 19 — No. 20:
Is the measured value within the specified
range?
450 — 650
Ω
Replace rear vehi-
cle speed sensor.
<Ref. to AT-58,
Rear Vehicle
Speed Sensor.>
6
PREPARE OSCILLOSCOPE.
Do you have oscilloscope?
Oscilloscope is available.
7
PREPARE SUBARU SELECT MONITOR.
Do you have a Subaru Select Monitor?
Subaru Select Monitor is avail-
able.
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст