Volvo B6324S - Page 17

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Enable condition Minimum Maximum
After start delay 20 s
Air ow 1.99 g/s
Engine coolant temp 60°C 110°C
Typical Fuel System diagnosis enable conditions
Malfunction criteria Threshold value
Adaptive fuelling value above limit
> 1.24
for specied time
> 5 s
Adaptive fuelling value below limit
< 0.78
for specied time
> 5 s
Typical Fuel System diagnosis malfunction thresholds
Fuel system adaptation error Monitor Strategy description
P0171
P0172
P0174
P0175
Lean fault, bank 1
Rich fault, bank 1
Lean fault, bank 2
Rich fault, bank 2
81
81
82
82
DTCs
Fuel system diagnostic operation Corresponding MonitorID
To be able to activate closed-loop lambda control after
engine start the following must be true:
- Oxygen Sensor readiness detected (sensor
heating must be completed).
- No errors present for the Oxygen Sensor.
- The engine start sequence must be
completed (engine rpm risen close to idle).
- It is required that the engine is running.
- No catalyst damaging misre detected.
- Not too big deviation of target lambda.
- Engine load not too low.
- No F/C (Fuel cut) recovery enrichment
effect.
Closed loop fuel trim