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Part 5

14 COMPREHENSIVE COMPONENTS MONITORING Contd.

14.10 Boost pressure sensor

Applicable only for test groups






14.10.1 General Description
The air pressure before the throttle is measured by the boost pressure sensor and transmitted to the ECM.

14.10.2 Boost Pressure Sensor Signal Rationality check high / low, P0236

Monitoring Strategy
In engine operating ranges in which no boost pressure is built up, the air pressure measured before the throttle is compared to the measured value of the altitude sensor.

Typical Enable Conditions
- Engine speed < defined threshold value for a defined time period
- Throttle angle < defined threshold value for a defined time period

Malfunction Criteria
The measured air pressure before the throttle is compared to a reference pressure when the engine speed and the throttle angle are both less than a defined threshold value for a defined time period and no boost pressure is built up. The reference pressure is modeled from the measured ambient pressure, taking into account the pressure drop caused by the air filter and the tolerances of the pressure sensors.

If the difference between the measured air pressure before the throttle and the reference pressure is greater than a defined positive threshold value, an irrationally high signal of the boost pressure sensor is detected and a fault is stored.

If the difference is less than a defined negative threshold value, an irrationally low signal of the boost pressure sensor is detected and a fault is stored






14.10.3 Circuit Monitoring Boost Pressure Sensor, P0237 / P0238
Short to Battery/Ground or Open Circuit

Monitoring Strategy
The signal voltage of the boost pressure sensor is continuously monitored.

Typical Enable Conditions
- None

Malfunction Criteria
Short to ground, P0237:
If the signal voltage of the boost pressure sensor is less than a defined threshold value for a defined time period, a short to ground is detected and a fault is stored in the fault memory.

Short to battery or open circuit, P0238:
If the signal voltage of the boost pressure sensor is greater than a defined threshold value for a defined time period, a short to battery or an open circuit is detected and a fault is stored in the fault memory.

14.11 Boost Pressure Control Valve

Applicable only for test groups










14.11.1 Circuit Monitoring Boost Pressure Control Valve Power Stage - P0245, P0246, P0243

Monitoring Strategy
For short to ground and open circuit:
The voltage at the output of the boost pressure control valve power stage is continuously monitored by the ECM.

For short to battery:
The current at the output of the boost pressure control valve power stage is continuously monitored by the ECM.

Typical Enable Conditions
For all monitors:
- Engine speed greater than defined threshold value

For short to ground and open circuit:
- Control signal for the position "Closed" is present at the boost pressure control valve

For short to battery:
- Control signal for the position "Open" is present at the boost pressure control valve

Malfunction Criteria
Short to ground, P0245:
If the voltage at the output of the boost pressure control valve power stage in the ECM is less than a defined lower threshold value for a defined time period, a short to ground is detected and a fault is stored in the fault memory.

Short to battery, P0246:
If the current at the output of the boost pressure control valve power stage in the ECM is greater than a defined threshold value for a defined time period, a short to battery is detected and a fault is stored in the fault memory.

Open circuit, P0243:
If the current at the output of the boost pressure control valve power stage in the ECM is greater than a defined upper threshold value for a defined time period, an open circuit is detected and a fault is stored in the fault memory.

14.12 Boost Pressure Control Monitoring (Turbocharger)

Applicable only for test groups:






14.12.1 General Description
The required boost pressure is calculated by the ECM from the torque request. The actual boost pressure is measured by a pressure sensor located before the throttle and is transmitted to the ECM. The boost pressure is controlled with a boost pressure control valve which is able to conduct part of the exhaust gases driving the turbocharger past the turbine rotor.

14.12.2 Boost Pressure too high / low - P2034 / P0299

Monitoring Strategy
The boost pressure measured by the boost pressure sensor (actual value) is compared to the boost pressure calculated by the ECM (setpoint value).

Typical Enable Conditions
For Boost Pressure too high:
- None

For Boost Pressure too low:
- "Launch Control" not active
- Total time of the boost pressure control being active > defined threshold value
- Boost pressure control valve closed
- Engine speed > defined threshold value (taken from a characteristic curve, depending on the ambient pressure)
- Ambient pressure > defined threshold value
- Absolute value of the difference between the setpoint boost pressure and the basic boost pressure > defined threshold value

Malfunction Criteria
The measured actual boost pressure value is subtracted from the calculated setpoint boost pressure value, and the control deviation is determined.

Boost Pressure too high - Boost Pressure exceeds the Allowable Threshold of the Boost Pressure Control, P0234:
If the control deviation is negative and its absolute value is greater than a defined threshold value for a defined time period, a measured boost pressure is detected that is too high and that exceeds the allowable threshold of the boost pressure control, and a fault is stored in the fault memory.

The defined threshold value for the fault detection is taken from a characteristic curve, depending on the difference between the setpoint boost pressure and the basic boost pressure. The basic boost pressure is defined as the boost pressure that is present when the boost pressure control valve is not activated.

Boost pressure too low - Boost Pressure falls below the Allowable Threshold of the Boost Pressure Control, P2099:
If the control deviation is positive and its absolute value is greater than a defined threshold value for a defined time period, a measured boost pressure is detected that is too low and that falls below the control threshold of the boost pressure control, and a fault is stored in the fault memory

14.13 Boost Pressure Control Monitoring (Compressor)

Applicable only for test group:






14.13.1 General Description
The supercharger output is controlled by the position of the supercharger bypass valve. When the bypass valve is closed, the taken-in air mass completely flows into the compressor. When the supercharger bypass valve is open, the air is conducted through a bypass around the compressor. In order to monitor the pressures and temperatures of the supercharger module, one sensor before the compressor and two sensors after the compressor (one sensor per bank) are used.






14.13.2 Boost Pressure Control Deviation, Setpoint pressure not reached, P2263

Monitoring Strategy
The control deviation of the boost pressure control is compared to a threshold value.

Typical Enable Conditions
- Setpoint load (Setpoint charge) > threshold value
The setpoint load must be great enough so that a minimum boost pressure is built up.

- Engine speed in defined range
- Altitude above sea level less than threshold value (air pressure > threshold value)

Malfunction Criteria
When the enable conditions are fulfilled, the monitor is started. From the setpoint value of the boost pressure and the mean actual boost pressure (mean value of the two sensor measurement values after the compressor), the control deviation is calculated. If the absolute value of the current control deviation is greater than a threshold value that is calculated as a function of the measured engine speed and the current ambient air pressure, the fault "Boost pressure control deviation, setpoint pressure not reached" is detected.

14.13.3 Minimum pressure after compressor not reached, P2262

Monitoring Strategy
The quotient of the pressure after the compressor and the pressure before the compressor is compared to a threshold value.

Typical Enable Conditions
- Throttle must be in a non-restricting position (position dependent on engine speed)
- Boost pressure control active
- The supercharger bypass valve must be closed to such an extent that boost pressure can be built up (the corresponding bypass valve position depends on the engine speed and is taken from a characteristic curve).

Malfunction Criteria
When the enable conditions are fulfilled, the monitor is started. The quotient of the pressure after the compressor and the pressure before the compressor is compared to an engine speed dependent threshold value, which is taken from a characteristic curve. With unthrottled operation and an active supercharger, a pressure that reaches a certain level is expected after the supercharger. If the quotient is less than a threshold value, the fault "Minimum pressure after compressor not reached" is detected.

14.13.4 MAP, deviation between the measurement values too high, P00C7

Monitoring Strategy
The absolute value of the difference between the MAP values (bank 1 and bank 2) is compared to a threshold value. Due to the symmetric design of the two intake manifolds, it can be assumed that the pressures in both intake manifolds are approximately equal.

Typical Enable Conditions
- Pressure sensors must have been evaluated as fault-free in the "Monitoring of the pressure sensors".

Malfunction Criteria
When the enable conditions are fulfilled, the monitor is started. If the absolute value of the difference between the two MAP values (measured MAP bank 1 - measured MAP bank 2) is greater than a threshold value, the fault "MAP, deviation between the measurement values too high" is detected.

14.13.5 MAP too high, P226B, P115D

This monitor is carried out for both bank 1 and bank 2.
Bank 1: P226B Bank 2: P115D

Monitoring Strategy
The measured MAPs of both banks are compared to defined threshold values.

Typical Enable Conditions
- Pressure sensors must have been evaluated as fault-free in the "Monitoring of the pressure sensors".

Malfunction Criteria
When the enable conditions are fulfilled, the monitor is started. If the measured MAP exceeds a threshold value, the fault "MAP too high" is detected.

14.13.6 Intake manifold temperature, deviation between the measurement values too high, P2199

Monitoring Strategy
The absolute value of the difference between the two intake manifold temperature measurement values (bank 1 and bank 2) is compared to a threshold value. Due to the symmetric design of the two intake manifolds, it can be assumed that the temperatures in both intake manifolds are approximately equal.

Typical Enable Conditions
- None

Malfunction Criteria
When the enable conditions are fulfilled, the monitor is started. If the absolute value of the difference between the two intake manifold temperature values (measured intake manifold temperature bank 1 - measured intake manifold temperature bank 2) is greater than a threshold value, the fault "Intake manifold temperature, deviation between the measurement values too high" is detected.

14.13.7 Intake manifold temperature too high, P0127, P0096

This monitor is carried out for both bank 1 and bank 2.
Bank 1: P0127 Bank 2: P0096

Monitoring Strategy
The measured intake manifold temperatures of both banks are compared to defined threshold values.

Typical Enable Conditions
- None

Malfunction Criteria
When the enable conditions are fulfilled, the monitor is started. If the measured intake manifold temperature exceeds a threshold value, the fault "Intake manifold temperature too high" is detected.




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