Fuel System Monitor

OBD System Description - Fuel System Monitor

Fuel System Lean Bank 1
DTC
P0171 Refer to DTC P0171: Fuel Trim System Lean Bank 1. P0171

MONITOR STRATEGY DESCRIPTION
The objective function of the fuel system diagnosis is to monitor the lambda control output and the lambda adaptation values in various areas. It should also cover the PCV monitoring where the lambda control output is considered in the idle range.
Breaking the adaptation and lambda controller limits for a long time, which may have been caused by failures in the fuel or intake system will involve emission rise and therefore shall be diagnosed by fuel system diagnosis. Fuel system diagnosis is active as soon as the general activation conditions are fulfilled and the lambda controller is activated.

MALFUNCTION CRITERIA AND THRESHOLD VALUE(S)
Adaptation learning area and Lower multiplicative adaptation learning area: Total duration of "upper limitation of additive adapted factor
Or
Upper limitation of multiplicative adapted factor" > 30 s
Error detection in case of lambda control - dead stop upper limit:
Diagnosis conditions in the area where the lambda control output concerned = fulfilled
And
Bottom threshold of controller output exceeded = true
And
Counter value as a measure of the oil dilution under cold start conditions < 30 => increment (Total duration of bottom threshold of controller output exceeded)
And
Total duration of bottom threshold of controller output exceeded > 45 s

SECONDARY PARAMETERS AND ENABLE CONDITIONS
Adaptation learning area and Lower multiplicative adaptation learning area: Enable Conditions:
- Closed Loop Active
- Application conditions fulfilled
- Fuel system diagnosis errors not detected during this trip.
- No inhibition due to high charcoal canister saturation. The canister purge system cycles closed for up to 60 seconds after 240 seconds of purge under all circumstances. Once canister purge has cycled off, there is no canister load and thus no canister inhibition due to saturation.
- RPM > 512 rpm
- MAF > 49 mgstk
- Coolant Temp. > 20.25 degrees C
- BARO > 699.99 hPa

Intake Air Temp. > -39.75 degrees C
If any one of the above conditions are not met then the diagnostic function will not activate.
This diagnostic is inhibited if any of the following DTC's are present:
- Ignition coil
- Manifold air pressure sensor
- MAF or TPS ratio check
- Throttle position sensor
- Coolant temperature sensor
- Air temperature intake manifold
- Mass airflow sensor
- Camshaft sensor
- Canister purge valve electrical error
- Canister purge valve mechanical error
- Crank shaft sensor
- Crankshaft limp home mode
- Injection valve
- LOAD sensor
- O2 sensor heater
- O2 sensor deterioration, upstream
- O2 sensor deterioration, downstream
- No misfire
- Throttle valve
- Secondary air system
- Purge system, fuel system

Error detection in case of lambda control - dead stop upper limit:
Enable Conditions:
- Closed Loop Active
- Application conditions fulfilled
- Fuel system diagnosis errors not detected during this trip.
- No inhibition due to high charcoal canister saturation. The canister purge system cycles closed for up to 60 seconds after 240 seconds of purge under all circumstances. Once canister purge has cycled off, there is no canister load and thus no canister inhibition due to saturation.
- RPM > 512 rpm
- MAF > 49 mgstk
- Coolant Temp. > 20.25 degrees C
- BARO > 699.99 hPa

Intake Air Temp. > -39.75 degrees C
This diagnostic is inhibited if any of the following DTC's are present:
- Ignition coil
- Manifold air pressure sensor
- MAF or TPS ratio check
- Throttle position sensor
- Coolant temperature sensor
- Air temperature intake manifold
- Mass airflow sensor
- Camshaft sensor
- Canister purge valve electrical error
- Canister purge valve mechanical error
- Crank shaft sensor
- Crankshaft limp home mode
- Injection valve
- LOAD sensor
- O2 sensor heater
- O2 sensor deterioration, upstream
- O2 sensor deterioration, downstream
- No misfire
- Throttle valve
- Secondary air system
- Purge system, fuel system

TIME LENGTH AND FREQUENCY
Recurrence rate: 20 ms

Fuel System Rich Bank 1
DTC
P0172 Refer to DTC P0172: Fuel Trim System Rich Bank 1. P0172

MONITOR STRATEGY DESCRIPTION
The objective function of the fuel system diagnosis is to monitor the lambda control output and the lambda adaptation values in various areas. It should also cover the PCV monitoring where the lambda control output is considered in the idle range. Breaking the adaptation and lambda controller limits for a long time, which may have been caused by failures in the fuel or intake system will involve emission rise and therefore shall be diagnosed by fuel system diagnosis. Fuel system diagnosis is active as soon as the general activation conditions are fulfilled and the lambda controller is activated.

MALFUNCTION CRITERIA AND THRESHOLD VALUE(S)
Additive adaptation learning area and multiplicative adaptation learning area:
Counter value as a measure of the oil dilution under cold start conditions < 30
And
Total duration of "upper limitation of additive adapted factor
Or
Upper limitation of multiplicative adapted factor of lower area" > 30 s
Error detection in case of lambda control - dead stop lower limit:
Diagnosis conditions in the area where the lambda control output concerned = fulfilled
And
Upper threshold of controller output exceeded = true
increment (Total duration of Upper threshold of controller output exceeded)
And
Total duration of upper threshold of controller output exceeded > 45 s

SECONDARY PARAMETERS AND ENABLE CONDITIONS
Additive adaptation learning area and multiplicative adaptation learning area: Enable Conditions:
- Closed Loop Active
- Application conditions fulfilled
- Fuel system diagnosis errors not detected during this trip.
- No inhibition due to high charcoal canister saturation. The canister purge system cycles closed for up to 60 seconds after 240 seconds of purge under all circumstances. Once canister purge has cycled off, there is no canister load and thus no canister inhibition due to saturation.
- RPM > 512 rpm
- MAF > 49 mgstk
- Coolant Temp. > 20.25 degrees C
- BARO > 699.99 hPa

Intake Air Temp. > -39.75 degrees C
If any one of the above conditions are not met then the diagnostic function will not activate. This diagnostic is inhibited if any of the following DTC's are present:
- Ignition coil
- Manifold air pressure sensor
- MAF or TPS ratio check
- Throttle position sensor
- Coolant temperature sensor
- Air temperature intake manifold
- Mass airflow sensor
- Camshaft sensor
- Canister purge valve electrical error
- Canister purge valve mechanical error
- Crank shaft sensor
- Crankshaft limp home mode
- Injection valve
- LOAD sensor
- O2 sensor heater
- O2 sensor deterioration, upstream
- O2 sensor deterioration, downstream
- No misfire
- Throttle valve
- Secondary air system
- Purge system, fuel system

Error detection in case of lambda control - dead stop lower limit:
Enable Conditions:
- Closed Loop Active
- Application conditions fulfilled
- Fuel system diagnosis errors not detected during this trip.
- No inhibition due to high charcoal canister saturation. The canister purge system cycles closed for up to 60 seconds after 240 seconds of purge under all circumstances. Once canister purge has cycled off, there is no canister load and thus no canister inhibition due to saturation.
- RPM > 512 rpm
- MAF > 49 mgstk
- Coolant Temp. > 20.25 degrees C
- BARO > 699.99 hPa

Intake Air Temp. > -39.7.5 degrees C
If any one of the above conditions are not met then the diagnostic function will not activate. This diagnostic is inhibited if any of the following DTC's are present:
- Ignition coil
- Manifold air pressure sensor
- MAF or TPS ratio check
- Throttle position sensor
- Coolant temperature sensor
- Air temperature intake manifold
- Mass airflow sensor
- Camshaft sensor
- Canister purge valve electrical error
- Canister purge valve mechanical error
- Crank shaft sensor
- Crankshaft limp home mode
- Injection valve
- LOAD sensor
- O2 sensor heater
- O2 sensor deterioration, upstream
- O2 sensor deterioration, downstream
- No misfire
- Throttle valve
- Secondary air system
- Purge system, fuel system

TIME LENGTH AND FREQUENCY
Recurrence rate: 20 ms

Fuel System Lean Bank 2
DTC
P0174 Refer to DTC P0174: Fuel Trim System Lean Bank 2. P0174

MONITOR STRATEGY DESCRIPTION
The objective function of the fuel system diagnosis is to monitor the lambda control output and the lambda adaptation values in various areas. It should also cover the PCV monitoring where the lambda control output is considered in the idle range. Breaking the adaptation and lambda controller limits for a long time, which may have been caused by failures in the fuel or intake system will involve emission rise and therefore shall be diagnosed by fuel system diagnosis. Fuel system diagnosis is active as soon as the general activation conditions are fulfilled and the lambda controller is activated.

MALFUNCTION CRITERIA AND THRESHOLD VALUE(S)
Additive adaptation learning area and multiplicative adaptation learning area: Total duration of "upper limitation of additive adapted factor
or
upper limitation of multiplicative adapted factor of lower area" > 30 s
Error detection in case of lambda control - dead stop upper Limit:
Diagnosis conditions in the area where the lambda control output concerned = fulfilled
And
Upper threshold of controller output exceeded = true
Counter value as a measure of the oil dilution under cold start conditions < 30
increment (Total duration of Upper threshold of controller output exceeded)
Total duration of Upper threshold of controller output exceeded > 45 s

SECONDARY PARAMETERS AND ENABLE CONDITIONS
Additive adaptation learning area and multiplicative adaptation learning area:
Enable Conditions:
- Closed Loop Active
- Application conditions fulfilled
- Fuel system diagnosis errors not detected during this trip.
- No inhibition due to high charcoal canister saturation. The canister purge system cycles closed for up to 60 seconds after 240 seconds of purge under all circumstances. Once canister purge has cycled off, there is no canister load and thus no canister inhibition due to saturation.
- RPM > 512 rpm
- MAF > 49 mgstk
- Coolant Temp. > 20.25 degrees C
- BARO > 699.99 hPa
- Intake Air Temp > -39.75 degrees C

If any one of the above conditions are not met then the diagnostic function will not activate. This diagnostic is inhibited if any of the following DTC's are present:
- Ignition coil
- Manifold air pressure sensor
- MAF or TPS ratio check
- Throttle position sensor
- Coolant temperature sensor
- Air temperature intake manifold
- Mass airflow sensor
- Camshaft sensor
- Canister purge valve electrical error
- Canister purge valve mechanical error
- Crank shaft sensor
- Crankshaft limp home mode
- Injection valve
- LOAD sensor
- O2 sensor heater
- O2 sensor deterioration, upstream
- O2 sensor deterioration, downstream
- No misfire
- Throttle valve
- Secondary air system
- Purge system, fuel system

Error detection in case of lambda control - dead stop upper Limit:
Enable Conditions:
- Closed Loop Active
- Application conditions fulfilled
- Fuel system diagnosis errors not detected during this trip.
- No inhibition due to high charcoal canister saturation. The canister purge system cycles closed for up to 60 seconds after 240 seconds of purge under all circumstances. Once canister purge has cycled off, there is no canister load and thus no canister inhibition due to saturation.
- RPM > 512 rpm
- MAF > 49 mgstk
- Coolant Temp. > 20.25 degrees C
- BARO > 699.99 hPa
- Intake Air Temp. > -39.75 degrees C

If any one of the above conditions are not met then the diagnostic function will not activate This diagnostic is inhibited if any of the following DTC's are present:
- Ignition coil
- Manifold air pressure sensor
- MAF or TPS ratio check
- Throttle position sensor
- Coolant temperature sensor
- Air temperature intake manifold
- Mass airflow sensor
- Camshaft sensor
- Canister purge valve electrical error
- Canister purge valve mechanical error
- Crank shaft sensor
- Crankshaft limp home mode
- Injection valve
- LOAD sensor
- O2 sensor heater
- O2 sensor deterioration, upstream
- O2 sensor deterioration, downstream
- No misfire
- Throttle valve
- Secondary air system
- Purge system, fuel system

TIME LENGTH AND FREQUENCY
Recurrence rate: 20 ms

Fuel System Rich Bank 2
DTC
P0175 Refer to DTC P0175: Fuel Trim System Rich Bank 2. P0175

MONITOR STRATEGY DESCRIPTION
The objective function of the fuel system diagnosis is to monitor the lambda control output and the lambda adaptation values in various areas. It should also cover the PCV monitoring where the lambda control output is considered in the idle range. Breaking the adaptation and lambda controller limits for a long time, which may have been caused by failures in the fuel or intake system will involve emission rise and therefore shall be diagnosed by fuel system diagnosis. Fuel system diagnosis is active as soon as the general activation conditions are fulfilled and the lambda controller is activated.

MALFUNCTION CRITERIA AND THRESHOLD VALUE(S)
Additive adaptation learning area and multiplicative adaptation learning area:
Counter value as a measure of the oil dilution under cold start conditions < 30
And
Total duration of "upper limitation of additive adapted factor
or
upper limitation of multiplicative adapted factor of lower area" > 30 s
Error detection in case of lambda control - dead stop lower Limit:
Diagnosis conditions in the area where the lambda control output concerned = fulfilled And bottom threshold of controller output exceeded = true
=> increment (Total duration of bottom threshold of controller output exceeded) Total duration of bottom threshold of controller output exceeded > 45 s

SECONDARY PARAMETERS AND ENABLE CONDITIONS
Additive adaptation learning area and multiplicative adaptation learning area: Enable Conditions:
- Closed Loop Active
- Application conditions fulfilled
- Fuel system diagnosis errors not detected during this trip.
- No inhibition due to high charcoal canister saturation. The canister purge system cycles closed for up to 60 seconds after 240 seconds of purge under all circumstances. Once canister purge has cycled off, there is no canister load and thus no canister inhibition due to saturation.
- RPM > 512 rpm
- MAF > 49 mgstk
- Coolant Temp. > 20.25 degrees C
- BARO > 699.99 hPa
- Intake Air Temp. > -39.75 degrees C

If any one of the above conditions are not met then the diagnostic function will not activate. This diagnostic is inhibited if any of the following DTC's are present:
- Ignition coil
- Manifold air pressure sensor
- MAF or TPS ratio check
- Throttle position sensor
- Coolant temperature sensor
- Air temperature intake manifold
- Mass airflow sensor
- Camshaft sensor
- Canister purge valve electrical error
- Canister purge valve mechanical error
- Crank shaft sensor
- Crankshaft limp home mode
- Injection valve
- LOAD sensor
- O2 sensor heater
- O2 sensor deterioration, upstream
- O2 sensor deterioration, downstream
- No misfire
- Throttle valve
- Secondary air system
- Purge system, fuel system

Error detection in case of lambda control - dead stop lower Limit:
Enable Conditions:
- Closed Loop Active
- Application conditions fulfilled
- Fuel system diagnosis errors not detected during this trip.
- No inhibition due to high charcoal canister saturation. The canister purge system cycles closed for up to 60 seconds after 240 seconds of purge under all circumstances. Once canister purge has cycled off, there is no canister load and thus no canister inhibition due to saturation.
- RPM > 512 rpm
- MAF > 49 mgstk
- Coolant Temp. > 20.25 degrees C
- BARO > 699.99 hPa
- Intake Air Temp > -39.75 degrees C

If any one of the above conditions are not met then the diagnostic function will not activate This diagnostic is inhibited if any of the following DTC's are present:
- Ignition coil
- Manifold air pressure sensor
- MAF or TPS ratio check
- Throttle position sensor
- Coolant temperature sensor - air temperature intake manifold
- Mass airflow sensor
- Camshaft sensor
- Canister purge valve electrical error
- Canister purge valve mechanical error
- Crank shaft sensor
- Crankshaft limp home mode
- Injection valve
- LOAD sensor
- O2 sensor heater
- O2 sensor deterioration, upstream
- O2 sensor deterioration, downstream
- No misfire
- Throttle valve
- Secondary air system
- Purge system, fuel system

TIME LENGTH AND FREQUENCY
Recurrence rate: 20 ms