Volvo B6324S Functional Description page 17

Fuel system diagnostic operation
Fuel system adaptation error
P0171
P0172
DTCs
P0174
P0175
Typical Fuel System diagnosis enable conditions
Enable condition
After start delay
Air flow
Engine coolant temp
Typical Fuel System diagnosis malfunction thresholds
Malfunction criteria
Adaptive fuelling value above limit
for specified time
Adaptive fuelling value below limit
for specified time
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.
Monitor Strategy description
Lean fault, bank 1
Rich fault, bank 1
Lean fault, bank 2
Rich fault, bank 2
Minimum
20 s
1.99 g/s
60°C
Threshold value
> 1.24
> 5 s
< 0.78
> 5 s
Closed loop fuel trim
- No catalyst damaging misfire detected.
- Not too big deviation of target lambda.
- Engine load not too low.
- No F/C (Fuel cut) recovery enrichment
effect.
Corresponding MonitorID
81
81
82
82
Maximum
110°C
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