Subaru IMPREZA 2002 Service Manual page 637

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE IDIAGNOSTICS)
Step
CHECK INPUT SIGNAL FOR ECM.
1)Turn the ignition switch to ON.
2)Measure the voltage between ECM and
chassis ground.
Connector & terminal
(9135) No. 26 (+)
-
Chassis ground ( - ) :
CHECK INPUT SIGNAL FOR ECM.
Measure the voltage between ECM and chas-
sis ground.
Connector & terminal
CHECK POOR CONTACT.
Check poor contact in ECM connector.
(9135)
No.
26 (+)
-
Chassis ground (-):
CHECK NEUTRAL POSITION SWITCH.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from transmission
harness.
3)Measure the resistance between transmis-
sion harness and connector termials.
Connector & terminal
(T2) NO. 1
-
NO. 2:
CHECK NEUTRAL POSITION SWITCH.
Measure the resistance between transmission
harness connector terminals.
CHECK HARNESS BETWEEN ECM AND
NEUTRAL POSITION SWITCH CONNEC-
TOR.
Measure the resistance between ECM and
chassis ground.
Connector & terminal
(8135)
No.
26
-
Chassis ground:
CHECK HARNESS BETWEEN ECM AND
NEUTRAL POSITION SWITCH CONNEC-
TOR.
1)Disconnect the connector from ECM.
2)Measure the resistance of harness between
ECM and transmission harness connector.
Connector & terminal
(B
135) NO. 26
-
(925)
NO. 1:
CHECK HARNESS BETWEEN ECM AND
NEUTRAL POSITION SWITCH CONNEC-
TOR.
Measure the resistance of harness between
transmission harness connector and engine
ground.
Connector & terminal
CHECK POOR CONTACT.
connector.
(925) No. 2
-
Engine ground:
~
Check poor contact in transmission harness
Check
Is the voltage more than 1 OV in
ieutral position?
Is the voltage less than 1 V in
Dther position?
Is the poor contact in ECM
connector?
Is the resistance more than
1 MR in neutral position?
Is the resistance less than 1
R
in other positions?
Is the resistance less than 10
Q?
Is the resistance less than 1
Q?
Is the resistance less than 5
R?
Is there poor contact in trans-
mission harness connector?
~
Yes
i o to step 2.
i o to step
3 .
iepair poor con-
x t in ECM con-
lector.
i o to step 5.
;o to step 6.
3epair ground
ihort circuit in har-
less between
X M and trans-
nission harness
:onnector.
;o
to step 8.
;o to step 9.
3epair poor con-
act in transmis-
;ion harness
:onnector.
No
30 to step 4.
30 to step 4.
:ontact with SOA
:distributor) ser-
dice.
Repair short circuit
n transmission
iarness or replace
ieutral position
switch.
Repair short circuit
in transmissin har-
ness or replace
neutral position
switch.
Go to step 7.
Repair open circuit
in harness
between ECM and
transmission har-
ness connector.
Repair open circuit
between transmis-
sion harness con-
nector and engine
ground terminal.
Contact with SOA
(distributor) ser-
vice.
EN(S0HC)-313