Waeco MagicSpeed MS800 Instrucciones De Montaje Y De Uso página 82

_MS-800.book Seite 82 Donnerstag, 1. Juni 2006 8:22 08
Troubleshooting
Test the cables with the ignition switched on, because some brake light
circuits are powered via the ignition.
The brown/white cable of the electronic module should be connected to a
brake light switch cable which is connected to either the permanent
positive terminal (terminal 30) or to the ignition (terminal 15).
The brown cable should be connected to the brake light switch cable
which connects the brake light lamp and the brake light switch. This
gives an earth signal from the brake light lamp supply cable when the
brake pedal is not pressed, and a positive signal (+12 V) when the brake
pedal is pressed.
The LED does not flash when an engine speed signal is received
(yellow wire)
This is how to check whether the speed regulator is receiving an incorrect
engine speed signal:
➤ Check the engine speed signal using a voltmeter or an oscilloscope.
➤ Make sure the signal is between 6 V and 250 V and the frequency range
is between 6 Hz and 488 Hz.
➤ Check that the yellow wire is not damaged and is properly connected to
the engine speed signal.
➤ Test the engine speed signal on the electronic module of the speed
regulator:
– Connect the red lead of the voltmeter or oscilloscope to the yellow wire
in the connecting plug of the electronic module.
– Connect the second lead of the voltmeter or oscilloscope to earth.
➤ Make sure the signal at the electronic module matches that of the car.
If the engine speed signal on the electronic module matches that of the car,
the fault may be due to an incorrect PPM setting. If you chose to record the
travel speed or engine speed signal using the blue wire, the speed controller
does not operate using the engine speed signal (yellow wire).
➤ Change the PPM setting to the input signal via the yellow wire.
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MagicSpeed MS800