Subaru IMPREZA GD 2007 Series Manual page 1909

asieps_tobira_IM_US.book 118 ページ ２０１２年１月１７日 火曜日 午後３時４８分
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
Judgment Value
Pump supply pressure diagnosis
Judge as NG if Delivery pipe pressure does not rise though it should when the secondary air pump turns OFF
→ ON.
Judge as NG when the following conditions are established. Judge as OK and clear the NG when the follow-
ing conditions are not established.
Malfunction Criteria
Secondary air delivery pipe pressure
(after barometric pressure compensa-
tion)
Combination valve one side closed pulse diagnosis
Calculate the voltage pulse of the pump delivery pipe pressure when the RH combination valve is closed and
the LH combination valve is open. The calculation of delivery pipe pressure should be large when the LH
combination valve is open. Judge that the LH combination valve is close stuck if the calculation is small.
Judge as NG when the following conditions are established. Judge as OK and clear the NG when the follow-
ing conditions are not established.
Malfunction Criteria
Pulse calculated value when the RH
combination valve is closed
Calculate the voltage pulse of the pump delivery pipe pressure when the LH combination valve is closed and
the RH combination valve is open. The calculation of delivery pipe pressure should be large when the RH
combination valve is open. Judge that the RH combination valve is close stuck if the calculation is small.
Judge as NG when the following conditions are established. Judge as OK and clear the NG when the follow-
ing conditions are not established.
Malfunction Criteria
Pulse calculated value when the LH
combination valve is closed
Combination valve both closed pulse diagnosis
Calculate voltage pulse of the pump supply pipe pressure when both combination valves are closed. The cal-
culation should be small because there is no pulse from supply pipe pressure with both combination valves
closed. When the calculation is large, determine that either of the combination valves is stuck open.
Determine which side of valves is stuck open by comparing secondary air flow amount when the RH combi-
nation valve is closed with that when the LH combination valve is closed. Air flow amount is larger on the
open stuck valve.
Judge as NG when the following conditions are established. Judge as OK and clear the NG when the follow-
ing conditions are not established.
Malfunction Criteria
Pulse calculation value when both com-
bination valves are closed
Air flow amount when the right bank is
closed (value from Map 4)
Pulse calculation value when both com-
bination valves are closed
Air flow amount when the left bank is
closed (value from Map 5)
Threshold Value
< 1 kPa (7 mmHg, 0.3 P0410
inHg)
Threshold Value
< Value from Map 1 P2443
Threshold Value
< Value from Map 2 P2441
Threshold Value
> Value from Map 3 P2440
≥ Air flow amount
when the left bank is
closed (value from
Map 5)
> Value from Map 3 P2442
> Air flow amount
when the right bank is
closed (value from
Map 4)
GD(H4DOTC)-118
DTC
DTC
DTC
DTC