APRILIA MSS Mana GT ABS, Service Station Manual

Page: 107 / 394

Throttle positioner autodetection : It allows the control unit to detect the closed throttle position; just
press the Enter key.
Self-adjustable parameters reset : Lambda probe self-adaptability parameters reset: operation to be
carried out after the throttle body is cleaned (every 30,000 km), or in the case a new engine, a new
lambda probe or a new injector is fitted, or the correct operation of the injection system or the valves is
restored
ELECTRICAL ERRORS
Throttle actuator position sensor P0120
Example value: open circuit, shorted to positive / shorted to negative.
Error cause
•
If the circuit is open, shorted to positive: excessive voltage has been detected at PIN 3 of
connector A (BROWN).
•
If shorted to negative: voltage equal to zero has been detected.
Troubleshooting
•
Circuit is open, shorted to positive: check the injection control unit connector and the sensor
connector: if they are not OK, restore; if they are OK, check the continuity between PIN 3 of
the connector A (BROWN) and PIN C (red cable): if there is not continuity, restore the cable
harness; if there is continuity, check continuity of the sensor between PIN A and PIN C: if
there is not continuity, replace the throttle body; if there is continuity, check the resistance:
if below 1.3 kOhm, replace the sensor; if above 1.3 kOhm, there is a short circuit to positive
on the red cable and it is necessary to restore the cable harness.
•
If shorted to negative: disconnect the sensor connector and check the ground insulation of
the red cable (from throttle sensor connector or control unit connector): if there is continuity
with the ground connection, restore the cable harness; if isolated from ground connection,
the resistance between PIN A and PIN C is below 1.3 kOhm; therefore, it is necessary to
replace the throttle body.
RESET PROCEDURE
Once the throttle body or the injection control unit is replaced, it is necessary to connect to the diagnosis
instrument selecting FUEL INJECTION and carry out the operation: Throttle position autodetection.
Engine oil pressure sensor
ENGINE OIL PRESSURE SENSOR
Function: it indicates the instrument panel if there is enough oil pressure (0.5 +/- 0.2 bar) (7.25 +/- 2.91
PSI) in the engine.
Operation / Operating principle: normally closed switch. With oil pressure above (0.5 +/-0.2 bar) (7.25
+/- 2.91 PSI), open circuit.
Location on the vehicle: under front cylinder
MSS Mana GT ABS
Electrical system
ELE SYS - 107