EN(H4DOTC)(diag)-288
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
30
CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL CON-
NECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Measure the resistance between ECM con-
nectors.
Connector & terminal
(B134) No. 19 — (B134) No. 18:
(B134) No. 19 — (B134) No. 28:
Is the resistance 1 MΩ or
more?
Go to step
31.
Repair the short
circuit to power in
the harness
between ECM con-
nector and elec-
tronic throttle
control connector.
31
CHECK SENSOR OUTPUT.
1) Connect all connectors.
2) Turn the ignition switch to ON.
3) Read the value of «Main-Throttle Sensor»
using Subaru Select Monitor.
NOTE:
For detailed operation procedures, refer to
“READ CURRENT DATA FOR ENGINE”. <Ref.
to EN(H4DOTC)(diag)-40, Subaru Select Moni-
tor.>
Is the value of «Main-Throttle
Sensor» 0.81 — 0.87 V?
Go to step
32.
Repair the poor
contact of elec-
tronic throttle con-
trol connector.
Replace the elec-
tronic throttle con-
trol if defective.
<Ref. to FU(STI)-
15, Throttle Body.>
<Ref. to FU(w/o
STI)-15, Throttle
Body.>
32
CHECK SENSOR OUTPUT.
Read the value of «Sub-Throttle Sensor» using
Subaru Select Monitor.
NOTE:
For detailed operation procedures, refer to
“READ CURRENT DATA FOR ENGINE”. <Ref.
to EN(H4DOTC)(diag)-40, Subaru Select Moni-
tor.>
Is the value of «Sub-Throttle
Sensor» 1.64 — 1.70 V?
Go to step
33.
Repair the poor
contact of elec-
tronic throttle con-
trol connector.
Replace the elec-
tronic throttle con-
trol if defective.
<Ref. to FU(STI)-
15, Throttle Body.>
<Ref. to FU(w/o
STI)-15, Throttle
Body.>
33
CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL MO-
TOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and
electronic throttle control.
3) Measure the resistance between ECM con-
nector and electronic throttle control connector.
Connector & terminal
(B134) No. 2 — (E57) No. 2:
(B134) No. 1 — (E57) No. 1:
Is the resistance less than 1 Ω? Go to step
34.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit in
harness between
ECM
connector
and
electronic
throttle
control
connector
• Poor contact of
coupling connector
34
CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL MO-
TOR.
1) Connect the connector to ECM.
2) Turn the ignition switch to ON.
3) Measure the voltage between electronic
throttle control connector and engine ground.
Connector & terminal
(E57) No. 2 (+) — Engine ground (–):
(E57) No. 1 (+) — Engine ground (–):
Is the voltage 5 V or more?
Repair the short
circuit to power in
the harness
between ECM con-
nector and elec-
tronic throttle
control connector.
Go to step
35.
Step
Check
Yes
No