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TS-5400 Datasheet(PDF) 6 Page - Keysight Technologies

Part No. TS-5400
Description  TS-5400 Series II Automotive Electronics Functional Test System
Download  15 Pages
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Maker  KEYSIGHT [Keysight Technologies]
Homepage  http://www.keysight.com
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TS-5400 Datasheet(HTML) 6 Page - Keysight Technologies

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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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