Diagnostic Trouble Codes with Test Charts (6-CYL): Overview BMW X5 E53 рестайлинг

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ENGINE PERFORMANCE & TRANSMISSION DIAGNOSTIC TROUBLE CODES

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TEST GROUP IDENTIFICATION

BMW supplies test group information in the following categories

1. «CATALYST MONITORING»(ref-247744-S06861405712007020700000)
2. «MISFIRE MONITORING»(ref-247744-S06109935292007020700000)
3. «EVAPORATIVE SYSTEM MONITORING»(ref-247744-S31652733262007020700000)
4. «SECONDARY AIR SYSTEM MONITORING»(ref-247744-S07193661442007020700000)
5. «FUEL SYSTEM MONITORING»(ref-247744-S17025322192007020700000)
6. «OXYGEN SENSOR MONITORING»(ref-247744-S36403805542007020700000)

General description

Catalyst monitoring is based on oxygen storage capacity.

The engine closed loop feedback control generates lambda (air/fuel ratio) oscillations in the exhaust gas. These oscillations are dampened by the oxygen storage activity of the catalyst. The amplitude of the remaining lambda oscillations downstream of the catalyst indicates the storage capacity.

General Description of Leak Measurement

The evaporative system monitoring permits the detection of leaks in the evaporative system with a diameter of 0.5 mm and up.

By means of a D iagnostic M odule_ T ank L eakage (DM-TL), an electrically actuated pump located at the atmospheric connection of the evaporative canister, a pressure test of the evaporative system is performed in the following order

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1. During the Reference Leak Measurement, the electrically actuated pump delivers through the reference restriction. The engine-management system measures the pump's electrical current consumption in this phase.
2. During the Leak Measurement, the electrically actuated pump delivers through the charcoal canister into the fuel-tank system. The pressure in the evaporative system may be up to 25 hPa depending on the fuel level in the tank. The engine-management system measures the pump's electrical current consumption. A comparison of the currents of the reference leak measurement and the leak measurement is an indication of the leakage in the tank.
3. After the test the remaining pressure in the evaporative system is bled off through the charcoal canister by switching off the pump and solenoid valve.

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General Description of Secondary Air System Monitoring

At cold start the secondary air pump and valve are switched on for their normal operating function. The secondary air delivered into the exhaust gas causes a lean mixture indicated by the output voltage of the oxygen sensor.

Any time the oxygen sensor indicates a lean mixture within the monitoring period, a counter is incremented by "one" up to a predetermined value.

This fixed limit corresponds to the minimum amount of secondary air (low-flow-limit-check).

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The fuel system monitoring looks for permanent deviations of the A/F controller (lean and rich) from the mean position.

General Description of Upstream Oxygen Sensor Monitoring

Both oxygen sensors upstream of the catalyst are separately monitored for rich and lean voltage and response time (period monitoring and switching period monitoring).

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General Description of Oxygen Sensor Heater Monitoring

For proper function of the oxygen sensor, the sensor element must be heated. A non-functioning heater delays the sensor readiness for closed loop control and influences emissions.

The monitoring function measures continuously both the sensor heater current as well as the heater voltage (heater supply voltage) in order to calculate the sensor heater resistance.

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Characteristics

1. ECM - controlled switching on of the sensor heater
2. one shunt for each sensor heater upstream and downstream of catalyst for current measurement

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