EN(H4DOTC)(diag)-365
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK SECONDARY AIR PIPING PRES-
SURE.
1) Turn the ignition switch to ON.
2) Using the Subaru Select Monitor, read sec-
ondary air piping pressure data, and compare
with the actual atmospheric pressure.
NOTE:
For detailed operation procedure, refer to
“READ CURRENT DATA FOR ENGINE”. <Ref.
to EN(H4DOTC)(diag)-34, Subaru Select Moni-
tor.>
Is the actual difference with
barometric pressure 50 mmHg
(6.7 kPa, 2.0 inHg, 0.97 psig) or
more?
Go to step 2.
Even if DTC is
detected, the cir-
cuit has returned to
a normal condition
at this time. Repro-
duce the failure,
and then perform
the diagnosis
again.
NOTE:
In this case, tem-
porary poor con-
tact of connector
may be the cause.
2
CHECK SECONDARY AIR PUMP.
1) Start the engine and warm up engine until
coolant temperature is higher than 75°C
(167°F).
2) Check whether the secondary air pump is
operating.
Is the secondary air pump oper-
ating?
Go to step 3.
Replace the sec-
ondary air combi-
nation valve LH.
<Ref. to
EC(H4DOTC)-22,
Secondary Air
Combination
Valve.>
3
CHECK HARNESS BETWEEN ECM AND
SECONDARY AIR PUMP RELAY CONNEC-
TOR.
1) Turn the ignition switch to OFF.
2) Remove the secondary air pump relay from
the relay box.
3) Measure the resistance between the sec-
ondary air pump relay connector and engine
ground terminals.
Connector & terminal
(F9) No. 13 — Engine ground:
Is the resistance 1 M
: or
more?
Go to step 4.
Repair the ground
short circuit of har-
ness between
ECM and second-
ary air pump relay
connector.
4
CHECK SECONDARY AIR PUMP RELAY.
Measure the resistance between the secondary
air pump relay terminals.
Terminals
No. 14 — No. 11:
Is the resistance 1 M
: or
more?
Repair the short
circuit of harness
to power supply
between second-
ary air pump relay
and secondary air
pump connector.
Replace the sec-
ondary air pump
relay. <Ref. to
EN(H4DOTC)(diag)
-8, Electrical Com-
ponent Location.>