Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual - part 384

GD(H4DOTC)-288

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

FW:DTC P2444 SECONDARY AIR INJECTION SYSTEM PUMP STUCK ON

1. OUTLINE OF DIAGNOSIS

Detect the secondary air pump malfunction (always ON).

After the secondary air pump turns to OFF, judge as NG if the secondary air pipe pressure is higher than that

before the secondary air pump operation.

2. ENABLE CONDITIONS

3. GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

4. DIAGNOSTIC METHOD

• 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: 8000 ms

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
• 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: 8000 ms

Secondary Parameters

Enable Conditions

Battery voltage

≥ 7 V

Engine

In operation

Judgment Value

Malfunction Criteria

Threshold Value

Time since secondary air control com-
pletion

≥ 3000 ms
and

≤ 8000 ms

Secondary air pipe pressure – Second-
ary air pipe pressure before operation

> 6.7 kPa (50 mmHg, 2 inHg)

Judgment Value

Malfunction Criteria

Threshold Value

Time since secondary air control com-
pletion

≥ 3000 ms
and

≤ 8000 ms

Secondary air pipe pressure – Second-
ary air pipe pressure before operation

≤ 6.7 kPa (50 mmHg, 2 inHg)

GD(H4DOTC)-289

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

FX:DTC P2610 ECM/PCM INTERNAL ENGINE OFF TIMER PERFORMANCE

1. OUTLINE OF DIAGNOSIS

Detect malfunction of soaking timer IC by the five diagnoses below.

2. COMPONENT DESCRIPTION

The soaking timer IC is built into the ECM.

Monitor Number

Explanation

Time required for diagnosis

Monitor #1

<Timer diagnosis>

Perform diagnosis of the soaking timer IC accuracy

196 ms

Monitor #2

<Full count diagnosis>

Perform diagnosis of the soaking timer IC counter 
function

4000 ms

Monitor #3

<Soaking timer IC setting diagnosis>

Perform diagnosis of communication between ECM 
and soaking timer IC

196 ms

Monitor #4

<Timer diagnosis (during soaking)>

Perform diagnosis of the soaking timer IC accuracy 
during soaking

3000 ms

Monitor #5

<Wake-up diagnosis>

Perform diagnosis of wake-up function

64 ms

EN-09090

soak:more than 3 h

ignition swich

main relay

driving cycle

ECM counter

Soak Timer IC counter

more than 10 min

1 h

Monitoring #1

Monitoring #3

Monitoring #2

Monitoring #4

Monitoring #5

GD(H4DOTC)-290

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

3. ENABLE CONDITIONS

4. GENERAL DRIVING CYCLE

Perform the diagnosis only once when the ignition switch is OFF and when the ignition switch is ON after the

soaking of one hour or more.

5. DIAGNOSTIC METHOD

<Timer diagnosis>
Start the count up operation of counters in ECM and in soaking timer IC when the engine is started.

Judge as timer malfunction if the difference between the counter in ECM and counter in soaking timer IC ex-

ceeds the allowable limit when the ignition switch is OFF.

Secondary Parameters

Enable Conditions

<Timer diagnosis>
Battery voltage

≥ 10.9 V

Ignition switch

OFF

Elapsed time after starting the engine

> 600 s

< Full count diagnosis & soaking timer IC setting diagnosis>
Battery voltage

≥ 10.9 V

Ignition switch

OFF

<Timer diagnosis (during soaking)>
Battery voltage

≥ 10.9 V

Ignition switch

OFF

Number of wake-up

 = 1, 2, 3, 4, 6, 8 
time(s)

<Wake-up diagnosis>
Ignition switch

ON

Wake-up activation time setting

Completed

Time in the soaking timer IC

> 3600 s

EN-08952

Malfunction

Malfunction

ignition swich

main relay

driving cycle

ECM counter

Soak Timer IC counter

Timer Monitoring

OK

GD(H4DOTC)-291

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.

<Full count diagnosis>
Reset the counter in soaking timer IC and start the count up operation.

Judge as full count diagnosis malfunction if counter in soaking timer IC is not $3FF (1023 count) after 4 sec-

onds.

•

Abnormality Judgment

Judge as NG when the following conditions are established.

Judgment Value

Malfunction Criteria

Threshold Value

|osoaktimcpu – osoaktimic| / osoaktim-
cpu

osoaktimcpu = Counter in ECM
osoaktimic = Counter in soaking timer IC

> 0.24

Judgment Value

Malfunction Criteria

Threshold Value

|osoaktimcpu – osoaktimic| / osoaktim-
cpu

≤ 0.24

Judgment Value

Malfunction Criteria

Threshold Value

osoakfcntic

osoakfcntic = Counter in soaking timer 
IC

≠ $3FF (1023 count)

EN-08953

4 sec

Malfunction

ignition swich

main relay

driving cycle

ECM counter

Soak Timer IC counter

Counter Monitoring

OK