Subaru IMPREZA GD 2007 Series Manual page 2279

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Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
DE:DTC P1602 CONTROL MODULE PROGRAMMING ERROR
1. OUTLINE OF DIAGNOSIS
Detect malfunctions of the catalyst advanced idling retard angle control.
Judge as NG when ECM is not controlling the angle properly during catalyst advanced idling retard angle
control.
Judge as NG if there is exhaust gas temperature diagnosis and idle speed diagnosis and if either of them is
NG.
• Exhaust gas temperature diagnosis
Judge as NG when the estimated exhaust gas temperature in 14 seconds after the cold start is below the
specified value.
• Idle speed diagnosis
Judge as NG when actual engine speed is not close to target engine speed after terminating the retard angle
control.
2. ENABLE CONDITION
Secondary Parameters
Atmospheric pressure
Battery voltage
Cold start diagnosis
Engine
Vehicle speed
Misfire within 200 engine revs.
Time after starting
3. GENERAL DRIVING CYCLE
Perform the diagnosis at cold start.
Enable Conditions
> 75.1 kPa (563
mmHg, 22.2 inHg)
> 10.9 V
Incomplete
Starting
≤ 2 km/h (1 MPH)
< 5
14 seconds
GD(STI)-212