Fuel System Monitor
OBD System Description - Fuel System MonitorFueltrim_B1_Lean
DTC Description / Detecting Condition / Confirmation Procedure
P0171 refer to P0171
Monitor Strategy Description
Determines when the fuel control is trying to respond to a very lean system, and has reached the point of emissions impact.
Malfunction Criteria
Long-term fueling average > 1.250 Mult.
AND
Short-term fueling average > 0.94 Mult.
Enable Conditions
Engine Speed >= 700 rpm
AND Engine Speed <= 6000 rpm
AND Engine coolant temperature >= 70 °C
AND Engine coolant temperature <= 115 °C
AND Intake Air Temperature >= -40 °C
AND Intake Air Temperature <= 120 °C
AND Throttle Position >= 0%
AND Throttle Position <= 95.0012%
AND Intake Air Flow >= 1.5 g/s
AND Intake Air Flow <= 45 g/s
AND Barometric Pressure >= 72 kPa
AND Vehicle Speed <= 140 kph
AND System Voltage >= 11 V
AND Closed Loop Active = TRUE
AND BLM learn Allowed = TRUE
AND No disabling faults active = FALSE
AND No disabling faults during this driving cycle = FALSE
Time required
Once Malfunctions Conditions are Met
Detection Time
1.25 seconds failure out of 2.38 seconds sample period
Continuous Monitoring every 125. ms loop time
Detection Samples
10 test failures within 6 test samples at 125. ms loop time
Fueltrim_B1_Rich
DTC Description / Detecting Condition / Confirmation Procedure
P0172 refer to P0172
Monitor Strategy Description
Determines when the fuel control is trying to respond to a very rich system, and has reached the point of emissions impact.
Malfunction Criteria
Long-term fueling average < 0.80 Mult.
AND
Short-term fueling average < 1.0601 Mult.
Enable Conditions
Engine Speed >= 700 rpm
AND Engine Speed <= 6000 rpm
AND Engine coolant temperature >= 70 °C
AND Engine coolant temperature <= 115 °C
AND Intake Air Temperature >= -40 °C
AND Intake Air Temperature <= 120 °C
AND Throttle Position >= 0%
AND Throttle Position <= 95.0012%
AND Intake Air Flow >= 1.5 g/s
AND Intake Air Flow <= 45 g/s
AND Barometric Pressure >= 72 kPa
AND Vehicle Speed <= 140 kph
AND System Voltage >= 11 V
AND Closed Loop Active = TRUE
AND BLM learn Allowed = TRUE
AND No disabling faults active = FALSE
AND No disabling faults during this driving cycle = FALSE
Time required
Once Malfunctions Conditions are Met
Detection Time
1.25 seconds failure out of 2.38 seconds sample period
Continuous Monitoring every 125. ms loop time
Detection Samples
10 test failures within 6 test samples at 125. ms loop time
Fueltrim_B1_ICO_Lean
DTC Description / Detecting Condition / Confirmation Procedure
P2187 refer to P2187
Monitor Strategy Description
Determines when the fuel control is trying to respond to a very lean system, and has reached the point of emissions impact at idle conditions.
Malfunction Criteria
EITHER:
Long-term fueling average for Idle Cells > 1.27 Mult.
AND
Short-term fueling average for Idle Cells > 0.8 Mult.
OR:
Long-term fueling average for Idle Cells > 1.27 Mult.
AND
Short-term fueling average for Hot Idle Cells > 0.8 Mult.
Enable Conditions
Engine Speed >= 700 rpm
AND Engine Speed <= 6000 rpm
AND Engine coolant temperature >= 70 °C
AND Engine coolant temperature <= 115 °C
AND Intake Air Temperature >= -40 °C
AND Intake Air Temperature <= 120 °C
AND Throttle Position >= 0%
AND Throttle Position <= 95.0012%
AND Intake Air Flow >= 1.5 g/s
AND Intake Air Flow <= 45 g/s
AND Barometric Pressure >= 72 kPa
AND Vehicle Speed <= 140 kph
AND System Voltage >= 11 V
AND Closed Loop Active = TRUE
AND BLM learn Allowed = TRUE
AND No disabling faults active = FALSE
AND No disabling faults during this driving cycle = FALSE
Time required
Once Malfunctions Conditions are Met
Detection Time
0.38 seconds failure out of 0.63 seconds sample period
Continuous Monitoring every 125. ms loop time
Detection Samples
3 test failures within 6 test samples at 125. ms loop time
Fueltrim_B1_ICO_Rich
DTC Description / Detecting Condition / Confirmation Procedure
P2188 refer to P2188
Monitor Strategy Description
Determines when the fuel control is trying to respond to a very rich system, and has reached the point of emissions impact at idle conditions.
Malfunction Criteria
EITHER:
Long-term fueling average for Idle Cells > 0.78 Mult.
AND
Short-term fueling average for Idle Cells > 1.5 Mult.
OR:
Long-term fueling average for Idle Cells > 0.78 Mult.
AND
Short-term fueling average for Idle Cells > 1.5 Mult.
Enable Conditions
Engine Speed >= 700 rpm
AND Engine Speed <= 6000 rpm
AND Engine coolant temperature >= 70 °C
AND Engine coolant temperature <= 115 °C
AND Intake Air Temperature >= -40 °C
AND Intake Air Temperature <= 120 °C
AND Throttle Position >= 0%
AND Throttle Position <= 95.0012%
AND Intake Air Flow >= 1.5 g/s
AND Intake Air Flow <= 45 g/s
AND Barometric Pressure >= 72 kPa
AND Vehicle Speed <= 140 kph
AND System Voltage >= 11 V
AND Closed Loop Active = TRUE
AND BLM learn Allowed = TRUE
AND No disabling faults active = FALSE
AND No disabling faults during this driving cycle = FALSE
Time required
Once Malfunctions Conditions are Met
Detection Time
0.38 seconds failure out of 0.63 seconds sample period
Continuous Monitoring every 125. ms loop time
Detection Samples
3 test failures within 6 test samples at 125. ms loop time