Measurement Computing DBK70 - Manual (Page 95)

DBK70 User’s Manual 937696 Troubleshooting 8-1
Troubleshooting 8
Symptom Possible Cause / Solution Manual
reference
Make sure the power switch is in the On position. 3-1
Some vehicles only supply power to the OBD connector when the engine
is running. Start the engine or apply external power.
3-1
Attached to
vehicle but no
Power LED
Some vehicles do not supply adequate power from the OBD connector.
Apply external power.
3-1
Check the Power LED. If it is not flashing or on solid, adequate power
has not been supplied or the power switch is in the off position. Apply
adequate power.
3-1
The serial cable between the PC and the DBK70 must be a straight-
through cable. Serial cables called “null-modem” swap the receive and
transmit signals. A null-modem cable is not compatible with the DBK70.
3-2
Doesn’t
“connect” to
PC
Check to make sure you’re connected to the right COM port of the PC, or
that the connected COM port has been selected properly in the software.
—
Check the Power LED. If it is not flashing or on solid, adequate power
has not been supplied or the power switch is in the off position. Apply
adequate power.
3-1
If the PID definition is incorrect, the associated output may be tracking
the wrong PID or a PID that does not exist. As a troubleshooting tool,
connect a PC to the DBK70 while the vehicle is running to show the
present value of the PID associated with a channel in real-time.
Check the fields of your PID record for correctness.
Check to make sure the desired PID is associated with the desired output.
If the Receive LED is not flashing, then none of the assigned PIDs are
being received.
6-1
If the Power LED is flashing, no network traffic is being detected. When
network traffic is sensed, the Power LED will come on solid. This could
be due to a network type that is incompatible with the network
interface(s) currently installed in the DBK70, or the desired messages
need to be requested before they are transmitted. Make sure you have the
correct network interface installed in the DBK70. If the messages need to
be requested, make sure the PID record has the appropriate entry in the
Message field. If request messages are being used, the Transmit LED
should flash.
4-4
If the LEDs are responding as expected, it could be that the analog
outputs are being improperly measured or loaded by the measurement
device. Check your connections. Make sure your measurement device
has adequate high input impedance.
—
Output not
tracking
selected
parameter
If you forget to save your PID assignments after configuring the DBK70,
all assignments will be lost when the system is powered down.
Re-configure and save the configuration.
5-9
Output is
erratic If the timeout duration in the “If no match in __mS” field (in Detailed
View) or “Timeout” field (in Summary View) is exceeded before the
message is received by the DBK70, the output voltage will return to the
value specified in the “set chan to __uV” field (in Detailed View), [the
“Default Value” in Summary View]. Increase the timeout value.
5-19
LogView
reads all
DBK70
channels as
Channel 0. Should this problem occur, it can be resolved by taking the simple steps
provided on the next page.
8-2