EN(H4DOTC)(diag)-428
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK FOR ANY OTHER DTC ON DISPLAY. Is any other DTC displayed?
Check the appropri-
ate DTC using the
“List of Diagnostic
Trouble Code
(DTC)”. <Ref. to
EN(H4DOTC)(diag)
-87, List of Diagnos-
tic Trouble Code
(DTC).>
Go to step
2.
2
CHECK ELCM PUMP.
Operate the ELCM pump using the Subaru
Select Monitor.
NOTE:
Refer to “Compulsory Valve Operation Check
Mode” for more operation procedures. <Ref. to
EN(H4DOTC)(diag)-64, Compulsory Valve Op-
eration Check Mode.>
Does the ELCM pump operate? Go to step
6.
Go to step
3.
3
CHECK POWER SUPPLY OF LEAK CHECK
VALVE ASSEMBLY.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the leak
check valve assembly.
3) Turn the ignition switch to ON.
4) Measure the voltage between the leak
check valve assembly connector and chassis
ground.
Connector & terminal
(R400) No. 3 (+) — Chassis ground (–):
Is the voltage 10 V or more?
Go to step
4.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit in
harness between
the main relay and
the leak check
valve
assembly
connector
• Poor contact of
main relay connec-
tor
• Poor contact of
coupling connector
4
CHECK HARNESS BETWEEN ECM AND
LEAK CHECK VALVE ASSEMBLY CONNEC-
TOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Measure the resistance of harness between
ECM connector and the leak check valve
assembly connector.
Connector & terminal
(B137) No. 27 — (R400) No. 4:
Is the resistance less than 1 Ω? Go to step
5.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit in
harness between
ECM
connector
and the leak check
valve
assembly
connector
• Poor contact of
coupling connector
5
CHECK HARNESS BETWEEN ECM AND
LEAK CHECK VALVE ASSEMBLY CONNEC-
TOR.
1) Measure the resistance of harness between
ECM connector and chassis ground.
Connector & terminal
(B137) No. 27 — Chassis ground:
Is the resistance 1 MΩ or
more?
Replace the leak
check valve
assembly. <Ref. to
EC(STI)-19, Leak
Check Valve
Assembly.> <Ref.
to EC(w/o STI)-20,
Leak Check Valve
Assembly.>
Repair the short
circuit to ground in
harness between
ECM connector
and leak check
valve assembly
connector.