Subaru IMPREZA GD 2007 Series Manual page 1801

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Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
4. GENERAL DRIVING CYCLE
1. Crankshaft cam timing diagnosis
Always perform the diagnosis while AVCS is not operating after starting the engine.
2. Slow response diagnosis
Always perform the diagnosis while AVCS is operating after starting the engine.
5. DIAGNOSTIC METHOD
1. Crankshaft cam timing diagnosis
Judge as NG when the standard timing advance is out of the specification. Judge as OK when it is within the
specification.
Judge as NG when the continuous time of meeting the following conditions is 20 seconds or more. Judge as
OK and clear the NG when the continuous time of not meeting the following conditions is 1 second or more.
Judgment Value
Malfunction Criteria
Standard timing advance
Time Needed for Diagnosis: 20 seconds
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in two continuous driving
cycles.
2. Slow response diagnosis
Calculates the positive and negative AVCS deviation amount separately. Judge as NG when the total value
is large after the predetermined time (30 seconds) has passed.
Abnormality Judgment
Judge as OK if the criteria below are met.
Judgment Value
Malfunction Criteria
AVCS target position
AVCS positive deviation integrated value > 8000°CA (R bank)
or
AVCS negative deviation integrated
value
Time Needed for Diagnosis: 30 seconds
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in two continuous driving
cycles.
Normality Judgment
Judge as OK and clear the NG when the malfunction criteria below are met.
Judgment Value
Malfunction Criteria
AVCS target position
AVCS positive deviation integrated value ≤ 8000°CA (R bank)
or
AVCS negative deviation integrated
value
Threshold Value
< –13°CA
or
> 25°CA
Threshold Value
≥ 0°CA
> 8000°CA (L bank)
< –8000°CA (R bank)
< –8000°CA (L bank)
Threshold Value
≥ 0°CA
≤ 8000°CA (L bank)
≥ –8000°CA (R bank)
≥ –8000°CA (L bank)
GD(H4DOTC)-10