MOTO GUZZI B043157 Service Station Manual page 120

Electrical system
with the vehicle ground connection: if it is grounded, restore the cable harness. If OK, replace the control
unit. If PIN 2 has approx. 12 V, check continuity of the yellow cable between PIN 1 of the sensor on the
cable harness side and PIN 12 of the ABS control unit connector. If this is not OK, restore the cable
harness. If it is OK, replace the sensor.
P0502 Rear wheel speed signal/sensor.
Connect to the ABS control unit diagnostics.
LOGIC ERRORS
Speed sensor
5DA1 the signal works irregularly:faulty sensor or signal interference.
Troubleshooting:Check speed sensor retainer. If it is not OK, restore it. If it is OK, check if the tone
wheel is dirty, deformed or wrongly fixed. If any of this happens, replace the tone wheel. Otherwise,
replace the speed sensor.
5DA2 the signal decreases periodically: Possible tone wheel fault due to deformations or dirt; pos-
sible alterations on the wheel bearing surface. In very rare cases, abnormal tone wheel vibrations.
Troubleshooting: Check if the tone wheel is dirty, deformed or wrongly fixed. If the tone wheel is not
OK, replace it. If it is OK, check for possible faults in the wheel bearings and if it is not OK, replace the
bearings.
5DA3 no signal or speed measured too low in relation to the front wheel: Faulty sensor or missing
sensor/tone wheel. Or excessive distance between the sensor and the tone wheel or tone wheel with
wrong number of teeth.
Troubleshooting: Check that the speed sensor and the tone wheel are installed. If they are not, install
them. If they are, check the speed sensor retainer. If it is not OK, restore it. If it is, check if the tone
wheel has the correct number of teeth or if it is dirty, deformed or wrongly fixed. If it is not OK, replace
the tone wheel and if it is OK, replace the speed sensor.
5DA4 missing acceleration after pressure reduction: Faulty sensor or missing sensor/tone wheel
or excessive distance between the sensor and the tone wheel.
Troubleshooting: Check that the speed sensor and the tone wheel are installed. If they are not, install
them. If they are, check the speed sensor retainer. If it is not OK, restore it. If it is, check if the tone
wheel has the correct number of teeth or if it is dirty, deformed or wrongly fixed. If it is not OK, replace
the tone wheel and if it is OK, replace the speed sensor.
5DA5 excessive measured speed: Faulty sensor or tone wheel, or tone wheel with wrong number of
teeth or wrong tyre size.
Troubleshooting:Check that the speed sensor and the tone wheel are installed. If they are not, install
them. If they are, check the speed sensor retainer. If it is not OK, restore it. If it is, check if the tone
wheel has the correct number of teeth or if it is dirty, deformed or wrongly fixed. If it is not OK, replace
the tone wheel and if it is OK, check that the tyre size is the correct one. If it is not OK, replace it. If it is
ELE SYS - 120
Moto Guzzi California 1400