Waeco MagicSpeed MS700 Instructions De Montage Et De Service page 64

MS-700.qxd 24/06/03 15:19 Page 64
Troubleshooting
The LED does not flash with input of a TACH signal
(speedometer signal via the yellow wire).
Wrong TACH signal (speedometer signal). Check the signal with a voltmeter or
oscilloscope. Ensure that the signal is between 6 V and 250 V and the frequency range is
between 5 Hz and 488 hz. After checking that the yellow wire is correctly connected, test
the signal in the cruise control electronics module once again. Connect the red wire of the
voltmeter or oscilloscope to the yellow wire in the connection plug of the electronics
module. Install the second cable of the voltmeter or the oscilloscope against the earth.
Ensure that the same signal is adjacent to the electronics module as is adjacent to the
pickup of the vehicle signal. If this is not the case, recheck the pickup and check the
yellow wire fordamage.
Wrong PPM setting. If the identification of the cruise signal is selected via the blue wire,
then cruise control does not work via the TACH signal (yellow wire). Change the PPM
setting to the input signal via the yellow wire.
The LED does not flash with input of a cruise signal (speed signal via the blue wire)
Wrong cruise signal. Check the signal with a voltmeter or oscilloscope. Ensure that the
signal is between 1.5 V and 24 V and the frequency range is between 5 Hz and 8.5 hz.
After checking that the blue wire is connected correctly, test the signal at the cruise
control electronics module once again. Connect the red wire of the voltmeter or
oscilloscope to the blue wire in the connection plug of the electronics module. Install the
second cable of the voltmeter or the oscilloscope against the earth. Ensure that the same
signal is adjacent to the electronics module as is adjacent to the pickup of the vehicle
signal. If this is not the case, recheck the pickup and check the blue wire fordamage.
Wrong PPM setting. If the identification of the cruise signal is selected via the yellow wire,
then cruise control does not work via the TACH signal (blue wire). Change the PPM
setting to the input signal via the blue wire.
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