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MOTO GUZZI B043157 Service Station Manual page 129

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Table of Contents
Moto Guzzi California 1400
2. Temperature signal
3. Power supply 5V
4. Signal
DIAGNOSTICS INSTRUMENT: PARAMETERS
Reference pressure Intake above sea level
Example value with key ON: 1009 mbar
Example value with engine on: 670 mbar
NOTE: pressure estimated by the control unit according to the throttle position
CAUTION
BEFORE CARRYING OUT ANY TROUBLESHOOTING, CAREFULLY READ THE GENERAL TROU-
BLESHOOTING CONCEPTS FOR ELECTRICAL DEVICES AT THE BEGINNING OF THE CHECK
AND CONTROL SECTION IN THE ELECTRICAL SYSTEM CHAPTER.
DIAGNOSTIC TOOL: ELECTRICAL ERRORS
P0105 cylinder air pressure sensor
shorted to positive / open circuit, shorted to negative.
Error cause
If shorted to positive: excessive voltage has been detected at PIN 24. If the circuit is open,
shorted to negative: voltage equal to zero has been detected at PIN 24.
Troubleshooting
If shorted to positive: verify that the parameter of the front cylinder air Pressure Sensor on
the diagnostics tool is approx. 1200 mbar; disconnect the sensor connector: if the value does
not vary, it means that the cable is shorted between the control unit connector and the sensor
connector: restore the cable harness; Replace the sensor if the value varies.
If the circuit is open, shorted to negative: check the Marelli control unit connector and the
sensor connector; if not OK, restore. If everything is OK, with key set to OFF, check if there
is continuity between the PIN 24 of the Marelli control unit and the sensor connector PIN 4:
if there is no continuity, restore the cable harness. If there is continuity, check the cable
ground insulation: if there is continuity to ground, restore the cable harness; if not, with key
set to ON check that the voltage on sensor connector PIN 3 is approx. 5 V: if not OK, set
the key to OFF and check continuity between the ENGINE connector PIN 51 and the sensor
connector PIN 3: if not OK, restore the cable harness; if OK, replace the control unit; if there
is 5V voltage at PIN 3, and with key set to ON, check the continuity to ground of the sensor
connector PIN 4: if not OK, restore the cable harness; if OK, replace the sensor.
DIAGNOSTICS TOOL: LOGIC ERRORS
P0107 air pressure sensor
signal not valid.
Error cause
Electrical system
ELE SYS - 129

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