APRILIA CAPONORD 1200 Service Station Manual page 124

Electrical system
the key to OFF and check continuity between the ENGINE connector PIN 25 and the sensor
connector PIN 1: if not OK, restore the cable harness; if OK, replace the control unit; if there
is 5V voltage at PIN 1, and with key set to ON, check the continuity to ground of the sensor
connector PIN 3: if not OK, restore the cable harness; if OK, replace the sensor.
rear cylinder air pressure sensor P0106
•
shorted to positive / open circuit, shorted to negative.
Error cause
•
If shorted to positive: excessive voltage has been detected at PIN 49. If the circuit is open,
shorted to negative: voltage equal to zero has been detected at PIN 49.
Troubleshooting
•
If shorted to positive: verify that the parameter of the rear cylinder air Pressure Sensor on
the diagnosis instrument 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 49 of the Marelli control unit and the sensor connector PIN 3:
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 1 is approx. 5 V: if not OK, set
the key to OFF and check continuity between the ENGINE connector PIN 25 and the sensor
connector PIN 1: if not OK, restore the cable harness; if OK, replace the control unit; if there
is 5V voltage at PIN 1, and with key set to ON, check the continuity to ground of the sensor
connector PIN 3: if not OK, restore the cable harness; if OK, replace the sensor.
DIAGNOSIS INSTRUMENT: LOGIC ERRORS
front cylinder air pressure sensor P0107
•
signal not valid.
Error cause
•
According to the engine operation data (rpm, throttle, etc.) an average value for the intake
pressure is estimated: if the value read deviates by a given percentage, this error is activa-
ted. The most frequent causes can be: abnormal resistance in the sensor circuit (for
example, rusted terminals) or sensor with poor performance.
Troubleshooting
•
Check the Marelli control unit connector and the sensor connector; if not OK, restore. If
everything is OK, check that resistance between ENGINE connector PIN 24 and sensor
ELE SYS - 124
CAPONORD 1200