Subaru 2002 IMPREZA Service Manual page 593

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Step
CHECK INPUT SIGNAL FOR ECM.
1)Turn the ignition switch to ON.
2)Measure the voltage between ECM and
chassis ground.
Connector & terminal
(8135) No. 19 (+)
-
Chassis ground (-):
CHECK INPUT SIGNAL FOR ECM.
Measure the voltage between ECM and chas-
sis ground.
!
Connector & terminal
(8135) No. 19 (+)
-
Chassis ground ( - ) :
1
CHECK POOR CONTACT.
Check poor contact in ECM connector.
I
CHECK HARNESS BETWEEN ECM AND
TCM CONNECTOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connectors from ECM and
TCM.
3)Measure the resistance of harness between
ECM and TCM connector.
Connector & terminal
(8135)
NO.
19
-
(854) NO. 13:
i CHECK HARNESS BETWEEN ECM AND
TCM CONNECTOR.
Measure the resistance of harness between
ECM and chassis ground.
Connector & terminal
(8135) No. 19
-
Chassis ground:
Check poor contact in TCM connector.
i CHECK POOR CONTACT.
Check
;the voltage more than 4.5 V?
;
the voltage more than 10 V?
s there poor contact in ECM
:onnector?
s the resistance less than
1
2?
s
the resistance less than 10
2?
s
there poor contact in TCM
:onnector?
Yes
;o to step 2.
qepair battery
;hort circuit in har-
less
between
X M and TCM
:onnector.
3epair poor con-
act in ECM con-
lector.
30 to step 5.
3epair ground
short circuit in har-
less between
:CM and TCM
:onnector.
3epair poor con-
:act in TCM con-
lector.
No
Go to step 4.
Go to step
3 .
Replace the ECM.
<Ref. to FU(D0HC
Engine Control
Module.>
Repair open circuit
in harness
between ECM and
TCM connector.
TURBO)-47,
Go to step 6.
Replace the TCM.
<Ref. to AT-45,
Transmission Con.
trol Module
(TCM) .>
EN( DOHC TU RB0)-369