GD(H4SO)-65
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
AJ:DTC P0171 SYSTEM TOO LEAN (BANK 1)
1. OUTLINE OF DIAGNOSIS
Detect fuel system malfunction by the amount of main feedback control.
Diagnostic method
Fuel system is diagnosed by comparing the target air fuel ratio calculated by ECM with the actual air fuel ratio
measured by sensor.
2. ENABLE CONDITIONS
3. GENERAL DRIVING CYCLE
Perform the diagnosis continuously at idling or at a constant speed after warming up the engine.
4. DIAGNOSTIC METHOD
• Abnormality Judgement
Compare the diagnosed value (fsobd) with the threshold value, and if a condition meeting the malfunction cri-
teria below continues for 10 s × 5 time(s) or more, judge that there is a fault in the fuel system.
Time Needed for Diagnosis:
10 s × 5 time(s)
Malfunction Indicator Light Illumination:
Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
• Normality Judgement
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:
10 s
Secondary Parameters
Enable Condition
A/F main learning system
In operation
Engine coolant temperature
t
75 °C (167 °F)
Engine load change
< 0.02 g/rev (0 oz/rev)
Engine load
t
Value of Map 1
Map1
Engine speed (rpm)
Idling
650
1000
1500
2000
2500
3000
3500
4000
4500
Measured value (g(oz)/rev)
na
0.208
(0.01)
0.201
(0.01)
0.185
(0.01)
0.183
(0.01)
0.193
(0.01)
0.206
(0.01)
0.206
(0.01)
0.225
(0.01)
0.245
(0.01)
Judgement Value
Malfunction Criteria
Threshold Value
fsobd = (sglmd – tglmda) + faf + flaf
t
Value of Map 2
In this case: sglmd = measured lambda
tglmda = target lambda
faf = main feedback compensation coef-
ficient every 64 milliseconds
flaf = main feedback learning compensa-
tion coefficient
Map 2
Amount of air (g (oz)/s)
0 (0)
3.2
(0.11)
6.4
(0.23)
9.6
(0.34)
12.8
(0.45)
16
(0.56)
19.2
(0.68)
fsobdL1 (%)
1.4
1.4
1.332
1.265
1.265
1.265
1.265
Judgement Value
Malfunction Criteria
Threshold Value
fsobd = (sglmd – tglmda) + faf + flaf
< 1.2
Содержание 2009 IMPREZA
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