Circuitlayout
The cooling fluid temperature sensor isinstalled on the engine head and provides the indications for the
digitalinstrument and for the injection.
It is realised with two electrically differentsections.
The injection section is realised with an NTCsensor connected to a 5V powered circuit. The resistance variation
causes avariation of the circuit voltage. Such voltage is combined with a temperaturevalue.
By this value, the controller can manage theengine operation, optimising it for all temperatures.
A failure of this circuit causes the switchingon of the injection indicator and the tripping of the safeties (among which
theelectric fan continuous start). In these conditions, the engine works, even thoughnot in an optimum way, always
safeguarding the catalytic converter integrity.
A false temperature value that falls within therange of possible temperatures is a failure very difficult to manage. This
cancause a failure of the safeties and an improper management of the carburetion.Such failure is more easily
detected upon
he engine start-up.
To check the sensor and the relevant circuit,proceed as follows:
TERMINALS
CONDITIONS
STANDARD
4 - 22
cooling fluid temperature
With connected sensor
20?= 2500 ? 100
Ω
80?= 308 ?6
Ω
1
CONTROLLER
3
AIR TEMPERATURE SENSOR
2
VALVE POSIT. SENSOR
4
FLUID TEMPERATURE SENSOR
1
- Connect the injection diagnostic tester dwg. 020460Y and select the menu on the "errors"
function.
Check whether there are any indications regarding the cooling fluid temperature sensor.
YES
go to 3
NO
go to 2
2
-
The EMS system has received no indications of temperatures out of the range of possible
temperatures.
If you suspect a wrong temperature indication, proceed to perform the following check.
NOTE: a wrong temperature signal can be detected by coupling the analogue
instrument indication with the electric fan start.
In any case, before checking the sensor, check the filling and bleeding of the cooling
system.
3
-
Before checking the sensor and the relevant circuit, wait until the engine has cooled down
and the vehicle has set to the working area temperature.
YES
go to 4
4
- Set the switch to "ON" with switch to "RUN" and side stand raised.
Select the menu on the "parameters" function.
Do not start the engine.
YES
go to 5
5
-
Check the following values:
cooling fluid temperature
sucked air temperature
ambient temperature
The three indications are equal or they are slightly different (e.g. 1?C).
YES
go to 6
NO
go to 7
6
-
The temperature sensor is providing an incorrect information.
Check at ~80?C.
7
- Install the specific tool dwg. 020481Y.
Do not connect the controller connector.
YES
go to 8
8
-
Disconnect the cooling fluid
temperature sensor connector.
Measure the sensor resistance
PGO BR-500 ENGINE
P.9-71
Cooling Fluid temperature sensor
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 ...