Time Needed for Diagnosis: 2000 ms + 2800 ms
Combination valve one side closed pulse diagnosis
Perform close stuck diagnosis of the LH combination valve using delivery pipe pressure pulse when the RH combination valve is closed.
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.
Abnormality Judgment
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
Time Needed for Diagnosis: 4000 ms + 992 ms + 992 ms + 992 ms
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
Normality Judgment
Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.
Time Needed for Diagnosis: 4000 ms + 992 ms + 992 ms + 992 ms
Perform close stuck diagnosis of the RH combination valve using delivery pipe pressure pulse when the LH 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.
Abnormality Judgment
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
Time Needed for Diagnosis: 4000 ms + 992 ms + 992 ms + 992 ms
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
Normality Judgment
Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.
Time Needed for Diagnosis: 4000 ms + 992 ms + 992 ms + 992 ms
Combination valve both closed pulse diagnosis
Perform open stuck diagnosis of both combination valves using delivery pipe pressure pulse when both combination valves are closed.
Determine which side of valves is stuck open by comparing secondary air flow amount when RH combination valve is closed with that when
LH combination valve is closed.
Calculate voltage pulse of the pump delivery pipe pressure when both combination valves are closed. The calculation 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 combination valve is closed with that
when the LH combination valve is closed. Air flow amount is larger on the open stuck valve.
Abnormality Judgment
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
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