Aprilia SR50R - Service manual > Electrical System

Checking the Electrical Components

CHECKING THE COMPONENTS IE361

1. Generator:

three-phase generator
winding resistance: 1 ohm
output voltage 50AC (to be measured with the generator disconnected from wiring system and the engine at 3000 rpm)

2. Rpm sensor:

inductive sensor
winding resistance: 110 ohms

3. Starter motor

current absorbed in operation: 20 A

4. Fuel pump:

absorption: 0.35 A

5. Tail light:

parking/stop light : 12 V 5 / 21 W

6. Ignition coil:

primary resistance: 0.7 ohms

7 Fuel sensor:

resistance across terminals 1 and 3:

• 5 ohms with full fuel tank
• 38 ohms with half full fuel tank
• 100 ohms with empty fuel tank

8. Fuses:

10A fuse (1) - From ignition switch to:

• Lights
• Low-High beam relay
• Horn
• Diagnostics circuit

15A fuse (2) - From battery to:

• Rectification/charge circuit
• Ignition switch
• Positive permanent on instrument panel
• Injection relay
• Engine kill switch
• Instrument panel key-operated power
  • Stoplights
  • Mixer oil reserve sensor
  • Fuel sensor
  • Coolant temperature sensor

9. Charging voltage:

voltage 13.5 V +- 0.3 V to be measured at battery poles (with engine at 3000 rpm)

10. Headlight:

low beam 12 V 35 W
high beam 12 V 35 W

11. Throttle body

FUEL INJECTOR

winding resistance: 1.7 ohms

THROTTLE POSITION SENSOR (TPS):

• resistance across terminals 1 and 4: 1.1 kOhms

Throttle grip CLOSED

• resistance across terminals 1 and 2: 1.1 kOhms
• resistance across terminals 1 and 3: 1.9 kOhms

Throttle grip OPEN

• resistance across terminals 1 and 2: 1.9 kOhms
• resistance across terminals 1 and 3: 1.1 kOhms tolerance on measured values: +- 10%

12. Air injector:

winding resistance: 1.3 ohms

13. Coolant temperature sensor

NTC sensor
resistance: 2.7 kOhms at 20 ºC

CHECKING THE COMPONENTS IE50

1. Generator:

three-phase generator
winding resistance: 1 ohm
output voltage 50AC (to be measured with generator disconnected from wiring system and engine at 3000 rpm)

2. Rpm sensor:

inductive sensor
winding resistance: 110 ohms

3. Starter motor

current absorbed in operation: 20 A

4. Fuel pump:

absorption: 0.35 A

5. Tail lights:

parking/stop light 12 V 5 / 21 W

6. Ignition coil:

primary resistance: 0.7 ohms

7. Fuel sensor:

resistance across terminals 1 and 3:

• 5 ohms with full fuel tank
• 38 ohms with half full fuel tank
• 100 ohms with empty fuel tank

8. Fuses:

10A fuse (1 - 2) - From ignition switch to:

• Horn
• Rectification/charge circuit
• Stoplights
• Injection relay
• Engine kill switch
• Instrument panel key-operated power
  • Turn indicators
  • Mixer oil reserve sensor
  • Fuel sensor
  • Coolant temperature sensor

9. Charging voltage:

voltage 13.5 V +- 0.3 V to be measured at battery poles (with engine at 3000 rpm)

10. Headlight:

low beam 12 V 35 W
low/high beam 12 V 35 W

11. Throttle body

FUEL INJECTOR

winding resistance: 1.7 ohms

THROTTLE POSITION SENSOR (TPS):

• resistance across terminals 1 and 4: 1.1 kOhms

Throttle grip CLOSED

• resistance across terminals 1 and 2: 1.1 kOhms
• resistance across terminals 1 and 3: 1.9 kOhms

Throttle grip OPEN

• resistance across terminals 1 and 2: 1.9 kOhms
• resistance across terminals 1 and 3: 1.1 kOhms tolerance on measured values: +- 10%

12. Air injector:

winding resistance: 1.3 ohms

13. Coolant temperature sensor

NTC sensor
resistance: 2.7 kOhms at 20 ºC

CHECKING THE COMPONENTS C364

1. Generator:

two-phase generator
winding resistance: 0.5-1 ohms
output voltage 30-35 VAC (to be measured with generator disconnected from wiring system and engine cranking)

2. Rpm sensor:

inductive sensor
winding resistance: 110 ohms

3. Starter motor

absorption in operation: 20 A.

4. Tail lights:

parking/stop light 12 V 5 / 21 W

5. Fuel sensor:

resistance (measure across pin 1 and 2)

• 5 ohms with full fuel tank
• 38 ohms with half full fuel tank
• 100 ohms with empty fuel tank

6. Fuses:

7.5A fuse (1) - From ignition switch to:

• Instrument panel key-operated power
  • Stoplights
  • Mixer oil reserve sensor
  • Fuel sensor
  • Coolant temperature sensor
• Turn indicator circuit
• Horn
• Diagnostics circuit

15A fuse (2) - From battery to:

• Rectification/charge circuit
• Ignition switch
• Positive permanent on instrument panel

7. Headlight:

low beam 12 V 35 W
high beam 12 V 35 W

8. Engine temperature sensor:

NTC sensor
resistance: 560 ohms (at 25ºC)
resistance: 40 ohms (at 100ºC)

Wiring System Diagrams

WIRING DIAGRAM IE 361

Key:

1. Multiple connectors
2. Low-High beam relay
3. Oil level switch
4. Fuel level sensor
5. Instrument panel (matrix)
6. Immobilizer antenna
7. Key-operated switch
8. Warning horn
9. Left dimmer switch
10. Rear stop switch (on left dimmer switch)
11. Right dimmer switch
12. Front stop switch (on right dimmer switch)
13. Rear left turn indicator
14. Tail light
15. Parking light/brake light
16. Rear right turn indicator
17. License plate light ( - only)
18. Pick-up sensor
19. Generator
20. Voltage regulator
21. Injection relay
22. Starter relay (noise proof)
23. Starter motor
24. Battery
25. Fuses
26. Fuel pump
27. Air injector
28. Fuel injector
29. Pressure sensor (or integrated in the control unit)
30. Head temperature sensor
31. H.T. coil
32. Spark plug
33. Throttle sensor
34. Serial connector (diagnosis)
35. Oil pump
36. ECU
37. Speed sensor
38. Front right turn indicator
39. Front parking lights (- only)
40. Low beam
41. High beam
42. Front left turn indicator
43. Headlight
44. Diode
45. -
46. -
47. -
48. -
49. -

WIRING DIAGRAM IE 50

Key:

1. Multiple connectors
2. -
3. Oil level switch
4. Fuel level sensor
5. Instrument panel (matrix)
6. Immobilizer antenna
7. Key-operated switch
8. Warning horn
9. Left dimmer switch
10. Rear stop switch (on left dimmer switch)
11. Right dimmer switch
12. Front stop switch (on right dimmer switch)
13. Rear left turn indicator
14. Tail light
15. Parking light/brake light
16. Rear right turn indicator
17. License plate light ( - only)
18. Generator
19. Voltage regulator
20. Injection relay
21. Starter relay
22. Starter motor
23. Battery
24. Fuse
25. Spark plug
26. H.T. coil
27. Fuel pump
28. Air injector
29. Fuel injector
30. Oil pump
31. Temperature sensor
32. Pick-up sensor
33. Throttle sensor
34. Serial connector (diagnosis)
35. Pressure sensor (or integrated in the control unit)
36. ECU
37. Speed sensor
38. Front right turn indicator
39. Front parking lights (- only)
40. Low beam
41. High beam
42. Front left turn indicator
43. Headlight
44. Diode
45. -
46. -
47. -
48. -
49. -

CABLE COLORS

Ar Orange
Az Light blue
B Blue
Bi White
G Yellow
Gr Gray
M Brown
N Black
R Red
V Green
Vi Violet
Ro Pink

WIRING DIAGRAM C 364

Key:

1. Multiple connectors
2. Speed sensor
3. Fuel level sensor
4. Instrument panel (easy)
5. Head temperature sensor
6. Oil level switch
7. Key ignition switch
8. Warning horn
9. Left dimmer switch
10. Rear stop switch (on left dimmer switch)
11. Right dimmer switch
12. Front stop switch (on right dimmer switch)
13. Rear left turn indicator
14. Tail light
15. Parking light/brake light
16. Rear right turn indicator
17. License plate light ( - only)
18. Starter relay
19. Starter motor
20. Battery
21. Fuses
22. Regulator
23. Pick-up sensor
24. Generator
25. SPARK PLUG
26. Transducer
27. Automatic choke
28. Front right turn indicator
29. Front parking lights ( - only)
30. Low beam
31. High beam
32. Front left turn indicator
33. Headlight
34. Serial connector (diagnosis)
35. -
36. -
37. -
38. -

 

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