Subaru 2002 IMPREZA Service Manual page 587

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Check
Is the voltage more than 3 V?
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
(B 136) No. 14 (+)
-
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
(8136) No. 14
-
Chassis ground:
CHECK HARNESS BETWEEN ECM AND
TCM CONNECTOR.
Measure the resistance of harness between
ECM and TCM connector.
Connector & terminal
(8136) NO. 14
-
(BSS)
NO.
20:
Yes
Repair poor con-
tact in ECM con-
Is
the resistance less than 10
R?
Is the resistance less than 1
R?
nector.
Repair ground
short circuit in har-
nessbetween
ECM and TCM
connector.
Repair poor con-
tact in ECM or
TCM connector.
No
So to step 2.
Go to step 3.
Repair open circuit
in harness
between ECM and
TCM connector.
EN(D0HC TURBO)-363