APRILIA MSS Mana GT ABS Service Station Manual page 86

Electrical system
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.
AXONE: FUEL INJECTION SYSTEM
PARAMETERS
Stepper base
Example value: 70 - 50
Steps corresponding to the idle motor reference position: approx. 70 when cold; approx. 50 when hot.
CL Stepper
Example value: 120 - 70
Steps set by the control unit for the idle motor. Steps at idle are so that the engine keeps the target
engine Revs set by the control unit: approx. 90 - 120 steps when cold; approx. 70 - 90 when hot.
Stepper regulator
Difference between current steps of idle motor and those at the reference position.
Virtual throttle angle from Stepper
Example value: 0°
If the engine is not at idle speed, this value indicates the motor air flow by the idle motor in throttle
degrees.
ACTIVATION
Stepper control:
For 4 s, advancement command of 32 steps; for the next 4 s, retrocession command of 32 steps and
so on for 30s
ELECTRICAL ERRORS
Idle check P0505 - shorted to positive / shorted to negative / open circuit
Error cause
•
If shorted to positive: excessive voltage has been detected at PINS 17 and 18 or PINS 9
and 19 of connector A (BROWN).
•
If shorted to negative: no voltage has been detected.
•
If the circuit is open: an interruption has been detected
Troubleshooting
•
If shorted to positive: with the key set to key ON disconnect the idle motor connector and
check if there is a voltage different from zero at the ends of one of the PINS on the cable
harness side: if there is voltage, restore the cable harness.
•
If shorted to negative: with the key set to key ON disconnect the idle motor connector and
check which pin on the cable harness side is in continuity with the ground connection and
restore the cable harness.
•
If the circuit is open: disconnect the idle motor connector and check the continuity towards
the motor between PINS A and D and between PINS B and C: if there is an interruption,
ELE SYS - 86
MSS Mana GT ABS