Subaru Impreza 2004 Service Manual page 171

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
CB:DTC P0864 TCM COMMUNICATION CIRCUIT RANGE/PERFORMANCE
• DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)(diag)-
47, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC)(diag)-39, Inspec-
tion Mode.>.
• WIRING DIAGRAM:
B55
1 2 3 4 5 6 7
8 9 10 11 12 13 14 15 16
17 18 19 20 21 22 23 24
Step
1 CHECK DRIVING CONDITION.
1)Start and warm-up the engine until the radia-
tor fan makes one complete rotation.
2)Drive the vehicle.
B56 TCM
B137 ECM
B137
1 2 3 4 5 6 7
8 9 10 11 12 13 14 15 16
17 18 19 20 21 22 23 24
Is the AT shift control function-
ing properly?
EN(H4DOTC)(diag)-250
Check
Go to step 2.
EN-01319
Yes No
Replace the TCM.
<Ref. to 4AT-74,
Transmission Con-
trol Module
(TCM).>