Aprilia Consumer Service Spa
Technical Service and Training
Release 4 july 99
This material is didactic and
may be changed following the technical
development of the product
1.3 SELF-DIAGNOSTICS FUNCTION:
The self-diagnostics function is part of the ECU software and is a valid aid to trouble-shooting in the
electronic injection system.
HOW THE FUNCTION WORKS:
With the control unit and dashboard connected and the key “on”, the multi-function LCD displays
the message “EFI” instead of the temperature reading for about 3 seconds
If the EFI message disappears after 3 seconds and TEMPERATURE appears (°C, °F or COLD),
this means that the injection control unit has found no static errors in the injection components. To
check the crankshaft and camshaft sensors, make a starting attempt lasting > 4 sec.
If EFI DOES NOT appear, this means there is no connection between the display and the control
unit (DIAG lead disconnected à check wiring)
If the EFI message persists, this means that the control unit has found a fault in the
sensors/components. Go into the Dealer Mode.
The diagnostics function is divided up as follows:
- USER MODE: If there is a fault, the user will see the “EFI” message remaining on the display
after starting. This is the only sensors/coils fault message that can be seen by the user
- DEALER MODE: Using connector 68, the mechanic will be able to read the corresponding fault
code on the LCD
How to access DEALER MODE:
1- Ground the control unit diagnostics terminal via connector 68 (see diagram). The message
DIAG will appear on the display
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