MOTO GUZZI B043157 Service Station Manual page 148

Electrical system
•
If shorted to positive: excessive voltage has been detected at PIN 48. If the circuit is open,
shorted to negative: voltage equal to zero has been detected at PIN 48.
Troubleshooting
•
If shorted to positive: check the value indicated by the Throttle Potentiometer 1 parameter
(voltage): disconnect the connector and read the value indicated by the diagnostics instru-
ment: if the voltage does not vary, there is a short circuit in the cable; replace the throttle
body if the voltage drops to zero
•
If the circuit is open, shorted to negative: check the throttle body connector and the control
unit connector. If not OK, restore; if everything is OK, check circuit continuity between the
two terminals. If not OK, restore the cable harness; if OK, check the circuit ground insulation
(from throttle sensor connector or control unit connector). If it is ground insulated, check that
there is power (+5 V) at the throttle body connector PIN 2, and that PIN 6 is connected to
ground. If both are correct, replace the throttle body
'sensor potentiometer 2 throttle position P0122
•
short circuit to positive / open circuit, short circuit to negative
Error cause
•
If shorted to positive: excessive voltage has been detected at PIN 50. If the circuit is open,
shorted to negative: voltage equal to zero has been detected at PIN 50.
Troubleshooting
•
If shorted to positive: check the value indicated by the Throttle Potentiometer 2 parameter
(voltage): disconnect the connector and read the value indicated by the diagnostics instru-
ment: if the voltage does not vary, there is a short circuit in the cable; replace the throttle
body if the voltage drops to zero
•
If the circuit is open, shorted to negative: check the throttle body connector and the control
unit connector. If not OK, restore; if everything is OK, check circuit continuity between the
two terminals. If not OK, restore the cable harness; if OK, check the circuit ground insulation
(from throttle sensor connector or control unit connector). If it is ground insulated, check that
there is power (+5 V) at the throttle body connector PIN 2, and that PIN 6 is connected to
ground. If both are correct, replace the throttle body
DIAGNOSTICS INSTRUMENT: LOGIC ERRORS
potentiometer 1 sensor, throttle position P0121
•
signal not valid
Error cause
•
Signal not within the expected value drawn according to the values of the intake pressure
Troubleshooting
ELE SYS - 148
Moto Guzzi California 1400