Subaru 2009 IMPREZA Service Manual page 901

Diagnostic Trouble Code (DTC) Detecting Criteria
DF: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 exhausted 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
Vehicle speed
Misfire in 200 engine revs.
Time after starting
3. GENERAL DRIVING CYCLE
Perform the diagnosis at cold start.
4. DIAGNOSTIC METHOD
• Exhaust gas temperature diagnosis
Abnormality Judgement
Calculate the estimated exhaust gas temperature when the diagnostic enable condition is established. Judge
as NG when the following conditions are established after engine starting within the predetermined time.
Judgement Value
Malfunction Criteria
Estimated exhaust gas temperature
Map
Coolant tempera-
–40 °C
ture after starting
(–40 °F)
the engine
Threshold value 162 °C
(AT model) (323.6 °F)
Threshold value 168 °C
(MT model) (334.4 °F)
Time Needed for Diagnosis: 14 seconds
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
Normality Judgement
Judge as OK and clear the NG if the following conditions are established.
Judgement Value
Malfunction Criteria
Estimated exhaust gas temperature
Time Needed for Diagnosis: Less than 1 second
Enable Conditions
75 kPa (563 mmHg,
22.2 inHg)
10.9 V
Incomplete
< 2 km/h (1.2 MPH)
< 5
= 14 seconds
Threshold Value
< Value from Map
–30 °C –20 °C –10 °C
(–22 °F) (–4 °F) (14 °F)
162 °C 162 °C 162 °C
(323.6 °F) (323.6 °F) (323.6 °F)
168 °C 168 °C 168 °C
(334.4 °F) (334.4 °F) (334.4 °F)
Threshold Value
Value from Map
GD(H4SO)-177
0 °C 10 °C 20 °C
(32 °F) (50 °F) (68 °F)
162 °C 162 °C 162 °C
(323.6 °F) (323.6 °F) (323.6 °F)
168 °C 168 °C 168 °C
(334.4 °F) (334.4 °F) (334.4 °F)
GENERAL DESCRIPTION
30 °C 40 °C 50 °C
(86 °F) (104 °F) (122 °F)
154 °C 142 °C 142 °C
(309.2 °F) (287.6 °F) (287.6 °F)
160 °C 145 °C 145 °C
(320 °F) (293 °F) (293 °F)