Subaru Legacy 2003 Service Manual page 632

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
1 CHECK HARNESS BETWEEN TCM AND
CCM CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connectors from TCM and
CCM.
3) Measure resistance of harness between
TCM and CCM connector.
Connector & terminal
(B55) No. 22 - (B94) No. 3:
Is the measured value less than the speci-
fied value?
2 CHECK HARNESS BETWEEN TCM AND
CCM CONNECTOR.
Measure resistance of harness between TCM
and chassis ground.
Connector & terminal
(B55) No. 22 - Chassis ground:
Does the measured value exceed the specified
value?
3 CHECK INPUT SIGNAL FOR TCM.
1) Connect connector to TCM and CCM.
2) Lift-up the vehicle or set the vehicle on free
rollers.
CAUTION:
On AWD models, raise all wheels off
ground.
3) Start the engine.
4) Cruise control main switch to ON.
5) Move selector lever to "D" and slowly
increase vehicle speed to 50 km/h (31
MPH).
6) Cruise control command switch to ON.
7) Measure voltage between TCM and chas-
sis ground.
Connector & terminal
(B55) No. 22 - Chassis ground:
Is the measured value less than the speci-
fied value?
4 CHECK POOR CONTACT.
Check poor contact in TCM connector.
Is there poor contact in TCM connector?
Value
1 Ω
1 MΩ
1 V
There is poor contact.
EN(H4SO)-235
ENGINE (DIAGNOSTICS)
Yes
Go to step 2. Repair open circuit
in harness
between TCM and
CCM connector.
Go to step 3. Repair short circuit
in harness
between TCM and
CCM connector.
Go to step 4. Check cruise con-
trol command
switch circuit.
<Ref. to CC-8,
INSPECTION,
Cruise Control
Command
Switch.>
Repair poor con- Replace TCM.
tact in TCM con- <Ref. to AT-76,
nector. Transmission Con-
trol Module
(TCM).>
No