Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 385
GD(H4DOTC)-292
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
•
Normality Judgment
Judge as OK when the following conditions are established.
<Soaking timer IC setting diagnosis>
When setting the activation setting time to soaking timer IC, compare the writing value to soaking timer IC
with read out value. Judge as malfunction if the values do not match 3 times in a row.
•
Abnormality Judgment
Judge as NG when the following conditions are established.
•
Normality Judgment
Judge as OK when the following conditions are established.
Judgment Value
Malfunction Criteria
Threshold Value
osoakfcntic
= $3FF (1023 count)
Judgment Value
Malfunction Criteria
Threshold Value
Writing value and read out value when setting the soaking timer
Unmatch
Number of retrying the soaking timer setting
≥ 3 times
Judgment Value
Malfunction Criteria
Threshold Value
Writing value and read out value when setting the soaking timer
Match
number of retrying
the Soak Timer
IC setting
EN-09338
ignition swich
main relay
driving cycle
ECM counter
Soak Timer IC counter
Soak Timer IC Monitoring
Malfunction
OK
GD(H4DOTC)-293
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
<Timer diagnosis (during soaking)>
Wake-up at the predetermined interval until 5, 7 or 9.5 hours have passed after the ignition switch is OFF,
and compare the counter in soaking timer IC with the counter in ECM.
Judge as malfunction if the counter in soaking timer IC is counted up to maximum value (1023 count) when
the counter in ECM is 1637 ms, or if the counter in soaking timer IC is not counted up to maximum value
(1023 count) when the counter in ECM is 2455 ms.
EN-08981
0 sec
2.455 sec
Timer diagnostic during soak
OK
ignition switch
main relay
ECM counter
Soak Timer IC counter
“Wake up” period
(3 sec)
“Wake up” period
(10 30 min)
Wake up
5 hours
1 hour
Evaporative leak diagnosis
Condition for monitoring
Soak Timer IC counter
ECM counter
$3FF (1023count)
Malfunction
Malfunction
$000 (0count)
1.637 sec
GD(H4DOTC)-294
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
•
Abnormality Judgment
Judge as NG when the following conditions are established.
•
Normality Judgment
Judge as OK when the following conditions are established.
Judgment Value
Malfunction Criteria
Threshold Value
When any one of the followings is established.
• All of the following conditions are established.
Counter in ECM
≤ 1637 ms
Counter in soaking timer IC
= $3FF (1023 count)
• All of the following conditions are established.
Counter in ECM
≥ 2455 ms
Counter in soaking timer IC
≠ $3FF (1023 count)
Judgment Value
Malfunction Criteria
Threshold Value
Following conditions are established.
• All of the following conditions are established.
Counter in ECM
≤ 1637 ms
Counter in soaking timer IC
≠ $3FF (1023 count)
• All of the following conditions are established.
Counter in ECM
≥ 2455 ms
Counter in soaking timer IC
= $3FF (1023 count)
GD(H4DOTC)-295
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
<Wake-up diagnosis>
Store the number of wake-up activation when the ECM wakes up by the soaking timer IC.
Next time when the ignition switch is ON, if the number of wake-up activation does not reach the predeter-
mined value even though the counter in soaking timer IC operates 1 hour or more, judge as wake-up mal-
function.
•
Abnormality Judgment
Judge as NG when the following conditions are established.
•
Normality Judgment
Judge as OK when the following conditions are established.
Judgment Value
Malfunction Criteria
Threshold Value
Number of wake-up
< Wake-up indication
count
Judgment Value
Malfunction Criteria
Threshold Value
Number of wake-up
≥ Wake-up indication
count
number of
wake-up
EN-09339
ignition swich
main relay
driving cycle
ECM counter
Soak Timer IC counter
Malfunction
OK
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