Subaru IMPREZA 2002 Service Manual page 575

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Step
CHECK HARNESS BETWEEN TCM AND
BRAKE LIGHT SWITCH CONNECTOR.
1)Disconnect the connectors from TCM and
brake light switch.
2)Measure the resistance of harness between
TCM and brake light switch connector.
Connector & terminal
Without cruise control
With cruise control
(B55)
NO.
24
-
(B64)
NO.
1:
(B55)
NO.
24
-
(B65)
NO.
3
CHECK HARNESS BETWEEN TCM AND
BRAKE LIGHT SWITCH CONNECTOR.
Measure the resistance of harness between
TCM and chassis ground.
Connector & terminal
(B55) No. 24
-
Chassis ground:
CHECK INPUT SIGNAL FOR TCM.
1)Connect the connectors to TCM and brake
light switch.
2)Measure the voltage between TCM and
chassis ground.
Connector & terminal
(B55)
No.
24 (+)
-
Chassis ground ( - ) :
I
CHECK INPUT SIGNAL FOR TCM.
Measure the voltage between TCM and chas-
sis ground.
Connector & terminal
(B55)
No.
24 (+)
-
Chassis ground (-):
I
CHECK POOR CONTACT.
Check poor contact in TCM connector.
Check
s the resistance less than
1
2?
s the resistance more than 1
im?
s the voltage less than 1 V
Hhen releasing the brake
iedal?
s the voltage more than 10 V
Nhen depressing the brake
Iedal?
s there poor contact in TCM
:onnector?
Yes
io
to step 3.
30 to step 4.
; o to step 5.
20 to step 6 .
qepair poor con-
act in TCM con-
lector.
No
Repair or replace
the harness and
connector.
NOTE:
In this case, repaii
the following:
Open circuit in
harness between
TCM and brake
light switch con-
nector
Poor contact in
TCM connector
Poor contact in
brake light switch
connector
Repair ground
short circuit in har-
ness between
TCM and brake
light switch con-
nector.
Adjust or replace
the brake light
switch. <Ref. to
SWITCH,
INSPECTION,
Stop Light Sys-
tem.>
Adjust or replace
the brake light
switch. <Ref. to
SWITCH,
INSPECTION,
Stop Light Sys-
tem.>
Replace the TCM.
<Ref. to AT-45,
Transmission Con.
trol Module
(TCM).>
LI-7, STOP LIGHT
LI-7, STOP LIGHT
EN(S0HC)-251