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Powertrain Control Module

(PCM) performs the following functions in relation to

OBD II diagnosis:

Perform self-diagnosis of microprocessor-based to ensure the proper functioning of the PCM and ensure safe storage of OBD II diagnostic data in memory.

Diagnoses embedded in real time and warn the driver by lighting in the event of a failure MIL Perform control functions of the powertrain to reduce emissions and OBD-II regulations in open loop operation at start-up time.

Perform control functions of the powertrain to reduce emissions and OBD-II regulations in closed loop control during normal operation.

perform self-diagnosis based on a microprocessor to ensure the smooth operation of the PCM and ensure safe storage of OBD II diagnostic data in memory.

The PCM performs the following self-test:

Check the checksum of the program memory in Rome with its function and Version.Führen standard read and write of memory cells, memory Perform proper functions of the processor in the processor, peripherals such as A / D converter, watchdog timer, and recorded to ensure that the processor correctly funktioniert.Führen vehicle data stored to ensure that the data are not corrupt and is within reasonable limits Fahrbetriebs.Führen you on-board diagnostics in real time and warn the driver by turning on MIL when an error by inserting the diagnostic functions with control of the vehicle.

diagnoses are assigned priority levels 1 to 8 or 9. The tests are the highest priority to each one millisecond, until the level of priority the tests every 5 milliseconds, 10 milliseconds, 20 milliseconds, 50 milliseconds, 100 milliseconds, 200 milliseconds, 500 milliseconds and 1 second, followed. Tests of the highest priority are those that impact security and emissions at a high level of OBD-II regulations. These include oxygen sensors (lambda) and controls the mixing in closed-loop operation of the vehicle. The next priority will be checked, the timer interrupt and watchdog timer. The next priority is the testing of sensors, including EGO sensor, acceleration sensor, Misfire, MAP sensor, speed sensor, MAF sensor, crankshaft position sensor and coolant sensor. The tests are intrusive tests next priority EGR catalyst and secondary air tank breather, level sensor, pedal, and the ignition timer. The next priority will be monitored regularly self-tests. The PCM performs onboard diagnostics in real time the PCM is the real-time scheduler, while performing their normal functions of control interrupted when tests are due on board. At this point PCM stores its current state of the vehicle and performs diagnosis. This process takes about 100 microseconds. Next, the PCM returns to its functions of control. This is repeated for each priority level of diagnosis. In this way, PCM spends about 15-40% of their time to make the diagnosis and the rest in the normal functions of control.

The test method of each element depends on the electrical properties of the vehicle and the duties performed by the device. The PCM keeps the upper and lower limits for each test parameter and the normal range and performance requirements for each component, it tests. The PCM also appropriate capacity testing equipment in a short circuit or open circuit, or the noise level of a signal control with battery, AC adapter, cables, each unit of the sensor, actuator and control of emissions .

find

PCM tests of each sensor is to measure each test parameter, for example, stored as an input or output and the comparison with the expected value in the technical data of the sensor.

The PCM compares the signals of the components under test with a combination of information from other sensors to check the plausibility of the component values. Noise and signal strength of each component is checked as well.

disks are similar to sensors for a short circuit, open circuit, and coverage and performance tested to be tested. The test method also includes computing a test output of a sensor with a different engine parameters and compares them to compliance. This is known as analytical redundancy. The reader is activated under certain conditions, intrusive, and its output is measured to verify against the expected value for proper operation. If the diagnosis of deviations from the desired values ​​in each test, the information in memory all the relevant data to support such as engine speed, MAP sensor, the temperature of the coolant and others will be saved. This is called "Freeze Frame", there is the condition of the vehicle at the time of the failure of this component .. Sun defects, appearance, or under certain conditions can be diagnosed when the error occurs only once in several cycles, it is removed.

The problem persists for two consecutive cycles, it is not removed until the defect is repaired by the technician. In the case of an output of a sensor out of range, replace the PCM with a reasonable value for the vehicle from the property. The PCM also provides clear information to the driver by flashing the MIL (malfunction indicator) in the case of a default without warning for minor problems. All relevant data for diagnosis and outboard repair work will be stored by the PCM in memory for later use. In the case of a defect that impairs the performance of the complete vehicle, the PCM has the full power condition of the vehicle removed to a safe state of lesser ability called "limp" condition, in which the vehicle in good condition operation, which consists of a switch the vehicle is stopped.

The PCM communicates with the OBD II scan tool and provides data and diagnostic OBD II DTC all the faults that are facilitated by the vehicle as far to the tester experienced external off-board diagnostics and repair. In this regard, OBD II SAE J1850 data link allows communication of diagnostic data, SAE J 2012, the DTC provides message formats and SAE J 1979 is the test mode and called PCM emissions data for the drive train diagnosis.

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