Subaru LEGACY 2006 Manual page 280

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK INPUT SIGNAL OF ECM.
1) Turn the ignition switch to ON.
2) Place the shift lever in neutral.
3) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B136) No. 31 (+) — Chassis ground (–):
2 CHECK INPUT SIGNAL OF ECM.
1) Place the shift lever except in neutral.
2) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B136) No. 31 (+) — Chassis ground (–):
3 CHECK POOR CONTACT.
Check poor contact of ECM connector.
4 CHECK NEUTRAL POSITION SWITCH.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the trans-
mission harness.
3) Place the shift lever in neutral.
4) Measure the resistance between transmis-
sion harness and connector terminals.
Connector & terminal
(T2) No. 1 — No. 2:
5 CHECK NEUTRAL POSITION SWITCH.
1) Place the shift lever except in neutral.
2) Measure the resistance between transmis-
sion harness connector terminals.
Connector & terminal
(T2) No. 1 — No. 2:
6 CHECK HARNESS BETWEEN ECM AND
NEUTRAL POSITION SWITCH CONNEC-
TOR.
Measure the resistance between ECM and
chassis ground.
Connector & terminal
(B136) No. 31 — Chassis ground:
(B136) No. 6 — Chassis ground:
7 CHECK HARNESS BETWEEN ECM AND
NEUTRAL POSITION SWITCH CONNEC-
TOR.
1) Disconnect the connectors from ECM.
2) Measure the resistance of harness
between ECM and transmission harness con-
nector.
Connector & terminal
(B136) No. 31 — (B25) No. 1:
8 CHECK HARNESS BETWEEN ECM AND
NEUTRAL POSITION SWITCH CONNEC-
TOR.
Measure the resistance of harness between
transmission harness connector and engine
ground.
Connector & terminal
(B25) No. 2 — Engine ground:
9 CHECK POOR CONTACT.
Check poor contact of transmission harness
connector.
Check
Is the voltage more than 10 V? Go to step 2.
Is the voltage less than 1 V?
Is there poor contact in ECM
connector?
Is the resistance more than 1
MΩ?
Is the resistance less than 1
Ω?
Is the resistance more than 1
MΩ?
Is the resistance less than 1
Ω?
Is the resistance less than 5
Ω?
Is there poor contact in trans-
mission harness connector?
EN(H4SO)(diag)-243
ENGINE (DIAGNOSTICS)
Yes No
Go to step 4.
Go to step 3. Go to step 4.
Repair the poor Contact the SOA
contact of ECM service center.
connector.
Go to step 5. Repair the short
circuit in transmis-
sion harness, or
replace the neu-
tral position switch.
Go to step 6. Repair the short
circuit in transmis-
sion harness, or
replace the neu-
tral position switch.
Go to step 7. Repair the ground
short circuit of har-
ness between
ECM and trans-
mission harness
connector.
Go to step 8.
Repair the open
circuit of harness
between ECM and
transmission har-
ness connector.
Go to step 9.
Repair the open
circuit between
transmission har-
ness connector
and engine ground
terminal.
Repair the poor Contact the SOA
contact of trans- service center.
mission harness
connector.