Subaru 2002 IMPREZA Service Manual page 293

DIAGNOSTICS FOR ENGINE STARTING FAILURE
ENGINE (DIAGNOSTICS)
i o to step
3 .
_ _ _ _ _ ~
Step
CHECK MAIN RELAY.
1)Turn the ignition switch to OFF.
2)Remove the main relay.
3)Connect the battery to main relay terminals
No. 1 and No. 2.
4)Measure the resistance between main relay
terminals.
Terminals
NO. 3
-
NO. 5:
NO. 4
-
NO. 6:
CHECK GROUND CIRCUIT OF ECM.
1)Disconnect the connector from ECM.
2)Measure the resistance of harness between
ECM and chassis ground.
Connector & terminal
(6134) No. 7
-
Chassis ground:
( 6 134) No. 15
-
Chassis ground:
(6134) No. 22
-
Chassis ground:
(6136)
No,
8
-
Chassis ground:
(6136)
No.
17
-
Chassis ground:
(6136)
No.
18
-
Chassis ground:
(8137)
No.
8
-
Chassis ground:
(8137)
No.
9
-
Chassis ground:
(684)
No,
1
-
Chassis ground: (MT vehi-
cle)
CHECK INPUT VOLTAGE OF ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(8137)
No. 10 (+)
-
Chassis ground ( - ) :
(8134) No. 5 (+)
-
Chassis ground ( - ) :
CHECK HARNESS BETWEEN ECM AND
MAIN RELAY CONNECTOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from ECM.
3)Measure the resistance between ECM and
chassis ground.
Connector & terminal
(6134)
No.
6
-
Chassis ground:
CHECK OUTPUT VOLTAGE FROM ECM.
1)Connect the connector to ECM.
2)Turn the ignition switch to ON.
3)Measure the voltage between ECM connec-
tor and chassis ground.
Connector & i terminal
(6134) No. 6 (+)
-
Chassis ground ( - ) :
CHECK INPUT VOLTAGE OF MAIN RELAY.
Check the voltage between main relay connec-
tor and chassis ground.
Connector & terminal
(647)
No.
2 (+)
-
Chassis ground ( - ) :
Repair open circuit
in harness
between ECM
connector and
engine grounding
terminal.
. CHECK GROUND CIRCUIT OF MAIN RE-
LAY.
1)Turn the ignition switch to OFF.
2)Measure the resistance between main relay
connector and chassis ground.
Connector 81 terminal
(847)
No.
1
-
Chassis ground:
io to step 4.
Check
s the resistance less than 10
2?
Repair open or
ground short cir-
cuit of power sup-
ply circuit.
s
the resistance less than 5
2?
i o to step 5.
; o to step 6.
; o to step
7.
; o to step 8.
s the voltage more than 10 V?
Repair ground
short circuit in har.
ness between
ECM connector
and main relay
connector, then
replace the ECM.
Replace the ECM.
<Ref. to FU(D0HC
Engine Control
Module.>
TURBO)-47,
Repair open circuil
in harness
between ECM
connector and
main relay connec
tor.
Repair open circuii
between main
relay and chassis
ground.
s the resistance more than 1
dnR?
s the voltage more than 10 V?
s
the voltage more than 10 V?
s the resistance less than 5
2?
relay.
I
I
EN( DOHC TURBO)-69