Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service 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
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