Circuit layout
The throttle body is provided with an auxiliaryair circuit. This is enabled by a piston valve controlled by a stepper
motor.
The stepper is powered by the controller onlywhen the opening must be changed.
The revolution is divided into portions called"steps".
By changing the opening "steps" it ispossible to properly feed the engine to facilitate the start-up procedure andadjust
the air feeding with cold engine.
When the engine reached the working temperature,the stepper partly closes again.
To prevent wear of the adjustment piston,operation at full speed is obtained with a minimum opening of about
20"steps".
To recover possible adjustments, every switchingto "OFF" causes the piston to close up to end of travel and to
openup again by a fixed number of steps (self-reset).
When the controller changes the stepper opening"steps" it also changes the injection time to ensure
propercarburetion.
Idling speed stabilises at 1450?0 G/1'. After ahot start-up step you can perceive the first increase in the revolutions
andthe subsequent closing of the stepper to stabilise the speed.
In case of irregular speed, before carrying outelectric checks inspect the gas valve and the auxiliary air circuit
cleaning.
To check the stepper and the relevant circuit,proceed as follows:
1
Controller
2
Stepper
1
- Connect the diagnostic tester dwg. 020460Y.
Set the switch to "ON" with switch to "RUN" and
side stand raised.
Lift the vehicle on the central stand. Select the
menu on the "ERRORS" function.
Check whether the controller has detected any
failures relating to the stepper circuit.
YES
go to 8
NO
go to 2
2
- Select the menu on the "parameters"
function. Check the number of "steps"
programmed by the controller to obtain start-up.
This setting is a function of the engine
temperature.
20
degree
C = ~ 80
~9
0 steps
YES
go to 3
NO
go to 4
3
- Start the engine and let it warm up.
With a cooling fluid temperature of more than 70
degree
, the controller must control the stepper with
about 20 "steps".
YES
go to 5
NO
go to 4
4
-
Check the cooling fluid temperature sensor signal. Check the controller, if necessary.
5
- Select the menu on the "active diagnosis"
function. Select "stepper" diagnosis. Start the
diagnosis with idle engine at the working
temperature. Check whether the stepper
PGO BR-500 ENGINE
P.9-84
Stepper Motor
Содержание BR-500
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Страница 2: ...INDEX OF TOPICS TIME CHART 12 ...
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Страница 14: ...INDEX OF TOPICS PRIOR TO DELIVERY 11 ...
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Страница 33: ...PGO BR 500 ENGINE P 10 14 Automatic Transmission ...
Страница 59: ...PGO BR 500 ENGINE P 10 40 Flywheel Cover ...
Страница 61: ... Check that the blow by circuit reed closes properly PGO BR 500 ENGINE P 10 42 Flywheel Cover ...
Страница 65: ...PGO BR 500 ENGINE P 10 46 Flywheel Cover ...
Страница 67: ...PGO BR 500 ENGINE P 10 48 Flywheel Cover ...
Страница 240: ...INDEX OF TOPICS BRAKING SYSTEM 8 ...
Страница 245: ...INDEX OF TOPICS STEERING WHEEL AND SUSPENSIONS 7 ...
Страница 250: ...INDEX OF TOPICS VEHICLE ENGINE 6 ...
Страница 253: ...INDEX OF TOPICS VEHICLE ENGINE 6 ...
Страница 257: ...Transmission Gear box explosive diagram P 6 5 ...
Страница 258: ...P 6 6 ...
Страница 259: ...INDEX OF TOPICS ELECTRIC SYSTEM 5 ...
Страница 272: ...PGO BR 500 ENGINE P 5 14 ...
Страница 273: ...INDEX OF TOPICS COOLING SYSTEM 4 ...
Страница 281: ...INDEX OF TOPICS MAINTENANCE 3 ...
Страница 303: ...INDEX OF TOPICS OPERATION 2 ...
Страница 318: ...INDEX OF TOPICS CHARACTERISTICS 1 ...