Caution! Before carrying out any troubleshooting, carefully read the general troubleshooting concepts for electrical devices at the beginning of the check and control section in the electrical system chapter.
1 - The "EFI" warning light is on and the word "service" is shown or the "EFI" warning light is flashing and the words "urgent service" are shown or one of the two situations takes place and is suddenly out or there is abnormal engine performance
2 - connect to the control unit through axone (minimum version: 5.1.5)
By selecting "self-diagnosis, Aprilia, SL 750 Shiver"
3 - Are current - "ATT" - or stored - "MEM" - errors shown in the "errors display" screen page?
YES, go to 4; NO, go to 12
4 - if the error in the central window is selected and "?" is displayed, press the key "?" to obtain further information about the error. then go to the "electrical system/checks and controls" chapter and read the information concerning the defective component
5 - according to what is indicated about the error/s, proceed as suggested and solve the problem
6 - was the problem solved by replacing the marelli control unit?
YES, go to 7; NO, go to 8
7 - read the activation procedure for a new control unit on the "electrical system/checks and controls/ecu/marelli control unit" chapter - end
8 - select "error clearing" from the "devices activation (injector)" screen page
9 - was the problem solved by replacing the throttle grip sensor (demand) or the throttle body?
NO, END; YES, go to 10
10 - read the reset procedure on the "electrical system/checks and controls/throttle grip position sensor or throttle body" chapter - end
11 - check if there are current or stored errors detected by the instrument panel referring to the "diagnosis" chapter, "instrument panel errors" section. if there are errors present, solve the failure and select "clear errors"; if there are no errors present, go to 12
12 - in the "engine parameter reading" screen page, does the "air temperature" parameter indicate a value equivalent to room temperature?
YES, go to 13; NO, note A
13 - in the "engine parameter reading" screen page, does the engine temperature parameter with cold engine indicate a value similar to that of the air temperature parameter? after starting the engine, does the parameter increase gradually indicating a correct value?
YES, go to 14; NO, note B
14 - in the "engine parameter reading" and the "lambda sensor correction" screen pages, with engine at idle and engine temperature at ＞90°C, does the value vary within the 0.9-1.1 range?
YES, go to 15; NO, note C
15 - in the "engine parameter reading" screen page and with engine at idle, are "front throttle correction parameters" or "rear throttle correction" within the (-0.4° - +0.4°) range? and in the same screen page, are the "front throt., pot. 1 (degrees)" and "rear throt., pot. 1 (degrees)" parameters more or = to 0.5° with engine at idle? Caution: the difference of the throttle correction values between the rear and front cylinder must not be ＞0.4°
YES, go to 16; NO, note D
16 - check: engine revolution sensor, fuel pressure, injectors (mechanical operation), coils (spark), engine mechanics - end
Note A: See the "electrical system/checks and controls/air temperature sensor" chapter.
Note B: See the "electrical system/checks and controls/engine temperature sensor" chapter.
Note C: See the "electrical system/checks and controls/lambda probe" chapter.
Note D: See the "electrical system/checks and controls/throttle body" chapter.
The engine does not start
Caution! Axone should be working properly and upgraded to the 5.1.5 version minimum.
Caution! Before any troubleshooting, make sure that:
- 1) battery voltage is above 12v;
- 2) the main 30a fuse is not damaged and is adequately fitted;
- 3) auxiliary fuses are not damaged and are adequately fitted.
Note. The relay number specified refers to the wiring diagram. the position of the relay on the vehicle is indicated in the "electrical system/component layout/ relay layout" chapter.
1 - with the key turned to "on", the instrument panel lights up but no failure indication is shown. is the fuel pump activated?
YES, go to 27; NO, go to 2
2 - does axone communicate with the control unit?
YES, go to 3; NO, go to 4
3 - activate one injector by means of axone ("devices activation" screen page, injector icon): is the injector activated?
YES, go to 17; NO, go to 12
4 -with the key turned to "off" check if there is voltage on the orange/red cable of the main injection relay (polarised) 41.
YES, go to 6; NO, go to 5
5 - inspect if there is an interruption in the orange/red cable from the main injector relay (polarised) to the battery positive.
6 - with the key turned to "on" check if there is voltage on the green/black cable of the main injection relay (polarised) 41.
OK, go to 8; NOT OK, go to 7
7 - inspect the green/black cable from the main injection relay (polarised) 41 to the key switch - end
8 - is the blue cable grounded?
YES, go to 10; NO, go to 9
9 - restore the cable harness.
10 - check if there is voltage on the red/black cable.
NOT OK, go to 11; OK, go to 12
11 - replace the main injector relay (polarised) 41 - end
12 - check if there is voltage on the orange/red cable of the auxiliary injection relay (polarised) 42.
YES, go to 13; OK, go to 14
13 - check if there is voltage on the yellow/purple cable.
OK, go to 15; NOT OK, go to 16
14 - restore the cable harness - end
15 - set the key to "off" and then "on": does the voltage on the yellow/purple cable reach approx. 1-2 V for 2 seconds?
YES, go to 17; NO, go to 18
16 - replace the auxiliary injector relay (polarised) 42 - end
17 - when the key is turned to "off", check continuity and ground insulation of the red/brown cable from the auxiliary injection relay 42 to the fuel pump connector.
YES, go to 20; NO, go to 19
18 - when the key is turned to "off", check continuity and ground insulation of the yellow/purple cable from the relay to pin 62, vehicle connector.
YES, go to 22; NO, go to 21
19 - restore the cable harness.
20 - check there is ground insulation for the blue cable of the pump connector.
OK, go to 24; NOT OK, go to 23
21 - restore the cable harness - end
22 - check the vehicle connector.
OK, go to 25; NOT OK, go to 26
23 - restore the cable harness - end
24 - check if the pump resistance is approx. 1 ohm. replace the pump if the resistance value is not that specified - end
25 - replace the control unit - end
26 - restore the cable harness - end
27 - does the motor turn when the starter button is pressed?
YES, go to 29; NO, go to 28
28 - what does the "start-up enabling switch" status on axone (device status/icon "0/1" screen page) mean?
YES, go to 43; NO, go to 64
29 - voltage to the yellow/pink cable of the retention relay (start-up logic) 39
OK, go to 30; NOT OK, go to 31
30 - with the retention relay (start-up logic) 39 disconnected, keep the starter button pressed and check if there is approx. 1-2v voltage in the yellow/red cable
OK, go to 32; NOT OK, go to 33
31 - restore the cable harness
32 - check the ground connection of the blue cable of the retention relay (start-up logic) 39
OK, go to 34; NOT OK, go to 35
33 - restore the cable harness
34 - check that the retention relay (start-up logic) 39 works correctly
OK, go to 36; NOT OK, go to 37
35 - restore the cable harness
36 - check continuity of the pink/black cable of the retention relay (start-up logic) 39 to pin 14 vehicle connector
OK, go to 38; NOT OK, go to 39
37 - replace the retention relay (start-up logic) 39
38 - check the vehicle connector (pin 14)
OK, go to 40; NOT OK, go to 41
39 - restore the cable harness
40 - refer to the chapter on "electrical system/ checks and controls/engine revolution sensor"; follow the troubleshooting steps in the section referring to "axone: electrical errors".
Caution: failure NOT identified, go to 42; failure identified, END
41 - restore the cable harness
42 - check injectors and engine for correct mechanical operation, check fuel circuit pressure.
43 - when the starter button is pressed, does the voltage to the yellow/pink cable of the control relay (start-up logic) 40 reach approx. zero?
YES, go to 44; NO, go to 45
44 - check if there is voltage in the red/black cables on the control relay (start-up logic) 40
YES, go to 50; NO, go to 51
45 - check continuity and ground insulation of the yellow/pink cable from the relay to the engine connector (pin 2)
OK, go to 47; NOT OK, go to 46
46 - restore the cable harness - end
47 - check the control unit connector
OK, go to 49; NOT OK, go to 48
48 - restore the cable harness - end
49 - replace the control unit - end
50 - pressing the starter button, disconnect the connector of the
White/sky blue and white/red cables of the start-up relay 36, and check if there is voltage to the yellow/red cable of the control relay- start-up logic- 40
OK, go to 52; NOT OK, go to 53
51 - replace the relay - end
52 - pressing the starter button, check if there is voltage to the yellow/red cable of the start-up relay
OK, go to 54; NOT OK, go to 55
53 - replace the relay - end
54 - check if the blue cable of the start-up relay 36 is grounded
OK, go to 56; NOT OK, go to 57
55 - restore the cable harness - end
56 - with the key turned to "off" check if there is voltage to the rear red cable (with protection cover) of the start-up relay 36
OK, go to 58; NOT OK, go to 59
57 - restore the cable harness - end
58 - pressing the starter button, check if there is voltage to the front red cable of the start-up relay 36
OK, go to 60; NOT OK, go to 61
59 - restore the cable harness
60 - check continuity of the red cable between the start-up relay 36 and the starter motor
YES, go to 62; NO, go to 63
61 - replace the start-up relay 36 - end
62 - replace the starter motor - end
63 - restore the cable harness - end
64 - what does the "fall sensor" status on axone (device status/icon "0/1" screen page) mean?
If "NORMAL" is shown, go to 65; If "TIP OVER" is shown, go to 68
65 - with the switch set to "run", what does the "run-stop switch" status on axone (device status/icon "0/1" screen page) mean?
If "RUN" is shown, go to 66; If "STOP" is shown, go to 67
66 - using axone check that the side stand, neutral sensor and clutch sensor function correctly; operate any device and check the suitable indication on the device status/icon "0/1" screen page
If "MALFUNCTION" is shown, go to 71; If "CORRECT OPERATION" is shown, go to 72
67 - refer to the chapter on "electrical system/checks and controls/fall sensor"; indication on axone always stop - end
68 - is the sensor vertical?
YES, go to 69; NO, go to 70
69 - refer to the chapter on "electrical system/checks and controls/fall sensor"; indication on axone always tip over - end
70 - set the sensor to the correct position - end
71 - According to the failure, refer to chapter on "electrical system/checks and controls/gear in neutral sensor", or "clutch lever sensor" or "side stand sensor" - end
72 - replace the control unit - end