Subaru IMPREZA 2002 Service Manual page 645

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Step
CHECK OUTPUT SIGNAL FROM ECM.
1)Start the engine, and warm-up the engine.
2)Turn the ignition switch to OFF.
3)Turn the ignition switch to ON.
4)Measure the voltage between ECM and
chassis ground.
Connector & terminal
(8134) No. 31 (+)
-
Chassis ground (-):
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 chassis ground.
Connector & terminal
(8134) No. 31
-
Chassis ground:
CHECK HARNESS BETWEEN ECM AND
TCM CONNECTOR.
Measure the resistance of harness betwee
ECM and TCM connector.
.
Connector & terminal
(8134) NO. 31
-
(854) NO. 2:
Check
Is the voltage more than 3 V?
Is the resistance less than 10
n?
Is the resistance less than 1
Q?
Yes
Repair poor con-
tact in ECM con-
nector.
Repair ground
short circuit in har-
ness between
ECM and TCM
connector.
Repair poor con-
tact in ECM or
TCM connector.
~
_ _ _ _ ~
No
30 to step 2.
30 to step
3.
Repair open circuii
in harness
Detween ECM and
TCM connector.
EN(S0HC)-321