KAL EQUIP KAL 3840 - Manual (Page 26)

5-20
6.1 COMPONENT TESTS
Preset Operation
The instrument provides predefined setups for a variety of vehicle sensors and circuits. To choose a preset test,
select COMPONENT TESTS from the MAIN MENU. From the resulting menu, select a test group:
• SENSORS
• ACTUATORS
• ELECTRICAL
• IGNITION
Then select a specific test from those listed. Each test places the instrument in a configuration best suited to display
signals for t he chosen device or circuit. Once a test has been selected, you can obt ain some useful ref erence
informations specific to that test at any time by pressing the HELP key as previously described.
In some cases there are more than one test f or a particular device. If you are not sure which test to use, the
descriptions to the tests in the following sections would help you decide.
When you want to test a device for which no test is provided, choose a test for a similar device. For example, to test
a temperature sensor not listed, try t he Fuel Temp Sensor test. Or choose SCOPE from the MA IN MENU and
configure the instrument manually as needed.
After you chose a preset test, you may change most instrument settings as needed to get a better look at the signal.
You can even change the display type between SCOPE mode and GMM mode.
6.2 SENSOR TESTS
6-1
6. AUTOMOTIVE DIAGNOSTICS & APPLICATIONS
SENSORS
COMPONENT TESTS
SENSOR TESTS MENU
ABS Sensor (Mag)
O
2 S Sensor (Zirc)
Dual O 2 Sensor
ECT Sensor
Fuel Temp Sensor
IAT Sensor
Knock Sensor
TPS Sensor
CKP Magnetic
CKP Hall
CKP Optical
CMP Magnetic
SENSOR TESTS MENU
CMP Hall
CMP Optical
VSS Magnetic
VSS Optical
MAP Analog
MAP Digital
MAF Analog
MAF Digi Slow
MAF Digi Fast
MAF Karman-Vrtx
EGR (DPFE)
MENU ( )
Noise Filter
Turn on the Filter (INSTRUMENT SETUP menu) for the input channel you are using. This blocks frequencies above
2 kHz and should reduce ignition impulse noises and other noises of the short spike variety.
Ground Connections
Many sensors output signals are “single ended” meaning t hat a single output pin delivers the signal with being
referred to a ground pin also on the sensor. In order for the signal to be accurately delivered to the PCM, however,
both the signal and ground parts of the circuit should be sound. If a sensor output signal at the PCM appears to be
erratic or its level appears incorrect, check t he signal at the out put pins of the sensor (both signal and ground
connections). If the signal is correct, suspect the wire harness of either t he signal or the ground side. Check for
voltage drops in both the signal and the ground paths between the sensor and the PCM.
Never trust that a chassis ground connection is the same as the PCM or the sensor ground. The ground continuity
can be disrupted by a missing strap or loose fastener easily.