Subaru Forester 2004 Service Manual page 188

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK INPUT SIGNAL FROM ECM.
1) Turn the ignition switch to ON.
2) Place the shift lever except in neutral posi-
tion.
3) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B137) No. 9 (+) — Chassis ground (
2 CHECK INPUT SIGNAL FROM ECM.
1) Place the shift lever in neutral position.
2) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B137) No. 9 (+) — Chassis ground (
3 CHECK POOR CONTACT.
Check poor contact in ECM connector.
4 CHECK INPUT SIGNAL FROM ECM.
1) Disconnect the connector from ECM.
2) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B137) No. 9 (+) — Chassis ground (
5 CHECK HARNESS BETWEEN ECM AND
TRANSMISSION HARNESS CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and
transmission harness connector (T9).
3) Measure the resistance of harness
between ECM and neutral switch connector.
Connector & terminal
(B137) No. 9 — (B128) No. 1:
6 CHECK NEUTRAL POSITION SWITCH
GROUND LINE.
Measure the resistance of harness between
transmission harness connector and engine
ground.
Connector & terminal
(B128) No. 3 — Engine ground:
7 CHECK NEUTRAL POSITION SWITCH.
1) Place the shift lever except in neutral posi-
tion.
2) Measure the resistance between transmis-
sion harness connector socket terminals.
Terminals
No. 1 — No. 3:
8 CHECK POOR CONTACT.
Check poor contact in transmission harness
connector.
Check
Is the voltage less than 1 V?
−
):
Is the voltage more than 10 V? Go to step 3.
−
):
Is there poor contact in ECM
connector?
Is the voltage more than 10 V? Repair battery
−
):
Is the resistance less than 1
Ω?
Is the resistance less than 5
Ω?
Is the resistance less than 1
Ω?
Is there poor contact in trans-
mission harness connector?
EN(H4DOTC 2.5)-187
ENGINE (DIAGNOSTIC)
Yes
Go to step 2. Go to step 4.
Go to step 4.
Repair the poor Contact the SUB-
contact in ECM ARU dealer.
connector.
Go to step 5.
short circuit in har-
ness between
ECM and trans-
mission harness
connector.
Go to step 6. Repair the harness
and connector.
NOTE:
In this case repair
the following:
• Open circuit in
harness between
ECM and trans-
mission harness
connector
• Poor contact in
transmission har-
ness connector.
• Poor contact in
ECM connector.
Go to step 7. Repair open circuit
in the neutral posi-
tion switch ground
line.
Go to step 8. Replace the neu-
tral position switch.
Repair poor contact Contact the SUB-
in transmission har- ARU dealer.
ness connector.
No