Subaru IMPREZA 2002 Service Manual page 611

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Yes
iven if MIL lights
rp, the circuit has
eturned to a nor-
nal condition at
his time. In this
:ase, repair poor
:ontact in ECM
:onnector.
Step
CHECK OUTPUT SIGNAL FROM ECM.
1)Turn the ignition switch to OFF.
2)Connect the test mode connector at the
lower portion of instrument panel (on the
driver's side), to the side of the center console
box.
3)Turn the ignition switch to ON.
4)While operating the radiator fan relay, mea-
sure voltage between ECM and chassis
ground.
NOTE:
Radiator fan relay operation can be executec
using Subaru Select Monitor. For procedure
refer to "Compulsory Valve Operation Check
Mode".<Ref. to EN(S0HC)-44, Compulsor)
Valve Operation Check Mode.>
Connector & terminal
(6134) No. 3 (+)
-
Chassis ground (-):
CHECK SHORT CIRCUIT IN RADIATOR FAN
RELAY CONTROL CIRCUIT.
1)Turn the ignition switch to OFF:
2)Remove the main fan relay and sub fan relay.
(with N C models)
3)Disconnect the test mode connector.
4)Turn the ignition switch to ON.
5)Measure the voltage between ECM and
chassis ground.
I
Connector & terminal
(6134) No. 3
( i )
-
Chassis ground (-):
I
CHECK MAIN FAN RELAY.
1)Turn the ignition switch to OFF.
2)Remove the main fan relay.
3)Measure the resistance between main fan
relay terminals.
Terminal
NO. 26
-
NO. 25:
I
CHECK SUB FAN RELAY.
1)Remove the sub fan relay.
2)Measure the resistance between sub fan
relay terminals.
Terminal
NO.
18 -NO. 17
I
CHECK POOR CONTACT.
Check poor contact in ECM connector.
No
Go to step 2.
Check
loes the voltage change
letween 0 and 10 V?
3epair battery
;hort circuit in
adiator fan relay
:ontrol circuit.
Zfter repair,
eplace the ECM.
:Ref. to
ingine Control
vlodule.>
3eplace the main
an relay and
ECM. <Ref. to
Engine Control
vlodu1e.z
3eplace the sub
an relay and
ECM. <Ref. to
Engine Control
vlodule.>
3epair poor con-
act in ECM con-
'U( S0HC)-47,
-U(SOHC)-47,
-U(SOHC)-47,
lector.
s the voltage more than 10 V? Go to step 3.
Go to step 4.
Go to step 5.
Replace the ECM.
<Ref. to
Engine Control
Module.>
FU(S0HC)-47,
s the resistance less than 1
n?
IS
the resistance less than 1
n?
's there poor contact in ECM
:onnector?
EN(S0HC)-287