Subaru IMPREZA 2002 Service Manual page 643

E
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DI AG NOSTICs\
~
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.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(8135) No. 4 (+)
-
Chassis ground (-):
CHECK HARNESS BETWEEN ECM AND
TCM CONNECTOR.
Measure the voltage between ECM connector
and chassis ground.
.
(8135) No. 4 (+)
-
Chassis ground ( - ) :
CHECK OUTPUT SIGNAL FROM ECM.
Measure the voltage between ECM and chas-
sis ground.
Connector & terminal
Connector & terminal
(8135) No. 4 (+)
-
Chassis ground ( - ) :
CHECK HARNESS BETWEEN ECM AND
TCM CONNECTOR.
Measure the voltage between TCM and chas-
sis ground.
Connector & terminal
CHECK POOR CONTACT.
Check poor contact in TCM connector.
(854) No. 4 (+)
-
Chassis ground (-):
Check
j
the voltage more than 10 V?
s the voltage more than 4 V?
s the voltage less than 1 V?
Ioes the voltage change from
I
V
to 4
V
while monitoring the
ralue with voltage meter?
s the voltage more than 4
V?
s there poor contact in TCM
:onnector?
EN(SOHC)=319
Yes
Repair battery
Short circuit in har-
less between
ECM and TCM
zonnector. After
repair, replace the
ECM. <Ref. to
Engine Control
Module.>
Go to step
5.
FU(S0HC)-47,
Repair poor con-
tact in ECM con-
nector.
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 6.
Repair poor con-
tact in TCM con-
nector.
-
No
Go to step 2.
Go to step
3.
Go to step 4.
Contact with SOA
(distributor) ser-
vice.
NOTE:
Inspection by DTk
is required, be
cause probabk
cause is deteriora
tion of multipk
parts.
Repair open circuii
in harness
between ECM and
TCM connector.
Check TCM powei
supply line and
grounding line.