Maintenance ST700 Dash Display System
70
Rotate the wheel by hand and check that the sensor indicator lights
up as each target passes the sensor
❑ Incorrect sensor gap (too far or too close)
Check that the gap is approximately 1mm ± 0.5mm.
❑ Sensor and targets moving apart
Fabricate a more rigid sensor bracket
Speed reading dies after a short time
❑ Ambient temperature is too high
Shield the sensor from radiated heat from brakes and bearings. Use fibre
washers to insulate the sensor from conducted heat. Duct cooling air around
the sensor.
Maximum temperature for correct operation of the wheel speed sen-
sor is +80°C (175°F)
Display works OK until engine starts then Display freezes or resets
continuously. Display recovers once the engine stops.
❑ Interference from ignition system and HT leads
Fit suppressed (Silicon) HT Leads. Fit a suppression capacitor (2.2uF) be-
tween the coil (battery connection) and chassis. Check the capacitor on the
distributor points system—fit a new capacitor if necessary.
Use ‘Helical’ suppressed leads in extreme cases.
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