Sensors and rev counter circuit (Aprilia RS125/3)

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Troubleshooting

Check the condition of the 15A fuse.

Check wiring connection.

Rev counter

Fit a substitute rev counter known to operate properly.

Coolant temperature

Disconnect the green-grey terminal wire and connect three resistors rated 1,000 Ω, 50 Ω and 15 Ω, respectively as shown.

When the ignition key is turned to ON, the following temperature readings or messages will appear on the display.

Resistor rating	Display indication
1,000 Ω	COLD
50 Ω	90-95°C
15 Ω	120-130°C

If display indications are correct, change the thermistor. Otherwise change the display.

Oil level sensor test

Disconnect all leads at the wiring harness end and remove the sensor from the frame.


Attach a multimeter set to the ohm range to the sensor.

(Information copied from the resource: «MotoInstruction»)

Hold sensor vertically. Correct reading: 0 Ω.

Turn sensor over. Correct reading: infinite resistance.

See this article in russian language

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Article about repair motorcycles «Aprilia RS-series RS 125» (1998-2005): «Sensors and rev counter circuit»: https://motoinstruction.ru/en/Aprilia/RS/RS125-3/electric/equipment/112917 <a href="https://motoinstruction.ru/en/Aprilia/RS/RS125-3/electric/equipment/112917">Sensors and rev counter circuit</a> - article about repair motorcycles «Aprilia RS-series RS 125» (1998-2005) from section «Equipment and devices». [url=https://motoinstruction.ru/en/Aprilia/RS/RS125-3/electric/equipment/112917]Sensors and rev counter circuit[/url] - article about repair motorcycles «Aprilia RS-series RS 125» (1998-2005) from section «Equipment and devices».