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TS-5400 Datasheet(PDF) 6 Page - Keysight Technologies |
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TS-5400 Datasheet(HTML) 6 Page - Keysight Technologies |
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6 / 15 page  6 Test Requirements and Methodologies Serial Most ECM designs include a serial interface as shown in figure 7. Communication protocols vary by manufacturer, but most comply with OBD2 standards. Variations include ISO-9141, J1939/CAN and J1850. The serial link is used in the automobile itself, but can also assist in the test- ing of the module. Test code (as opposed to operational code) is either included in ROM or downloaded through the serial link into the mod- ule. Operational code is either pres- ent in ROM during test or is down- loaded when the unit is shipped. Using test code routines as part of the test program, the test system establishes a set of conditions to which the ECM responds. This test approach is called UUT-assisted test. Power Analog Sensors Coil Drivers for Ignition Coil Injection Drivers for Fuel Injectors Serial Interface Knock Sensor Discrete Inputs Display Lamps Other Outputs µController Figure 7. Serial interface for engine control ECM UUT-Assisted Test For clarity, consider three different modes for performing UUT-assisted test. The mode chosen will be defined by the test stimulus source and response destination. Serial Link Evaluation: This first mode simply evaluates the serial link and microcontroller. Commands received by the microcontroller over the serial link prompt a serial response that is sent back to the test system. The sys- tem then verifies the response and it may follow with a full CRC memory check. Parametric tests may also be run to test the serial link’s character- istics, such as delay, rise and fall times, and input impedance. I/O Status Evaluation: This mode uses the test system I/O to deter- mine the ECM input states. This is accomplished by sending a message over the serial link to the ECM prompting it to run one of its loaded test routines. For example, use of this mode may occur when supplying an analog input into the system to verify the A/D conversion and the control- ler’s handling and communication of the proper (hex) data over the serial link. Specifically, this analog input may be a simulation of a sensor’s output for air or water temperature, the throttle position indicator (TPI), manifold air pressure (MAP) and the like. This mode illustrates how UUT- assisted testing allows the test sys- tem to assess proper functioning of several functions at once—including the controller and serial link. In addition, the system can assess the A/D and waveform processing circuitry. Input Evaluation: The final mode involves the test system supplying input, then reading the value at either the input or output of the module. For example, this would include dynamic tests such as the application of a cam/crank phase synchronous wave- form, (MAP or TPI input). This evalua- tion would verify if the signal is read correctly at the input of the module or if the given signal prompted the appropriate response at the module’s output. |
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