Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. 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