Subaru Impreza 2003 Service Manual page 1749

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
N: DTC 76 2-4 BRAKE DUTY SOLENOID
DIAGNOSIS:
The output signal circuit of 2-4 brake duty solenoid is open or shorted.
TROUBLE SYMPTOM:
Excessive shift shock.
WIRING DIAGRAM:
B11
3 4
1 2
5 6 7
9 11 12
10
13 14 15
17 18 19 20
Step
1 CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from transmission
and TCM.
3)Measure the resistance of harness between
TCM and transmission connector.
Connector & terminal
(B54) No. 18 — (B11) No. 9:
2 CHECK HARNESS CONNECTOR BETWEEN
TCM AND CHASSIS GROUND.
Measure the resistance of harness between
TCM and chassis ground.
Connector & terminal
(B54) No. 18 — Chassis ground:
3 CHECK 2-4 BRAKE DUTY SOLENOID.
Measure the resistance between transmission
connector receptacle's terminals.
Terminals
(T4) No. 16 — No. 9:
4 PREPARE SUBARU SELECT MONITOR.
B54
1 2 3 4 5 6
8
10 11 12 13 14 15 16 17 18
19 20 21
16
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
B54
TCM
B11
T4
AT7
2-4
BRAKE DUTY
SOLENOID
TRANSMISSION
8 9
7
22 23 24
Check
Is the resistance less than 1
Ω?
Is the resistance more than 1
MΩ?
Is the resistance 2.0 — 4.5 Ω? Go to step 4.
Do you have a Subaru Select
Monitor?
4AT-79
Yes
Go to step 2. Repair the open
circuit in harness
between TCM and
transmission con-
nector.
Go to step 3. Repair the short
circuit in harness
between TCM and
transmission con-
nector.
Go to step 10.
Go to step 7. Go to step 5.
AT-00588
No