Subaru IMPREZA 2002 Service Manual page 641

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Step
CHECK HARNESS BETWEEN ECM AND
TCM CONNECTOR.
1)Turn the ignition switch to ON.
2)Measure the voltage between ECM and
chassis ground.
Connector & terminal
(8135) No. 4 (+)
-
Chassis ground ( - ) :
CHECK HARNESS BETWEEN ECM AND
TCM CONNECTOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from ECM and
TCM.
3)Measure the resistance of harness between
ECM and chassis ground.
Connector & terminal
(8135) No. 4
-
Chassis ground:
1
.CHECK OUTPUT SIGNAL FOR ECM.
1)Connect the connector to ECM.
2)Turn the ignition switch to ON.
3)Measure the voltage between ECM and
chassis ground.
Connector & terminal
(8135) No. 4 (+)
-
Chassis ground ( - ) :
CHECK TROUBLE CODE FOR AUTOMATIC
TRANSMISSION.
Read the trouble code for automatic transmis-
sion. <Ref. to AT-24, Read Diagnostic Trouble
Code (DTC).>
I
Check
5
the voltage less than 1 V?
s the resistance less than 10
2?
s the voltage more than 5 V?
loes the trouble code appear
or automatic transmission?
Yes
30 to step 2.
3epair ground
short circuit in har
less between
X M and TCM
:onnector.
30 to step 4.
Inspect trouble
:ode for automatic
transmission.
<Ref. to AT-44,
Diagnostic Proce-
jure with Diagnos
tic Trouble Code
[ DTC).>
No
Even if MIL lights
up, the circuit has
returned to a nor-
mal condition at
this time.
NOTE:
In this case, repai
the following:
Poor contact in
ECM connector
Poor contact in
TCM connector
Go to step 3.
Repair poor con-
tact in ECM con-
nector.
Replace the TCM.
<Ref. to AT-45,
Transmission Con,
trol Module
(TCM).>
EN(S0HC)-317