VESPA 946 E4 EMEA 2021 Manual page 232

Braking system
-if at least one malfunction is detected, the ABS warning light turns on permanently.
The ABS system is disabled!
The system is still fully functional like any other brake system without ABS.
The detection of malfunctions may require more or less time depending on the type of fault.
Following the detection logic one or more conditions must persist within a certain time to detect errors.
If during this time one of the conditions is lost and then reappears, the timer is reset and the system is
not able to detect the fault.
The ABS system continues to be inactive.
GUIDE TO ABS FAULT DIAGNOSIS
1. ABS LAMP ON
2. CONNECT THE DIAGNOSTIC TOOL
- DOES THE DIAGNOSTIC TOOL COMMUNICATE? (NO, go to 3; YES, go to 4)
3. PERFORM THESE CHECKS:
A. Ground PIN 7 and PIN 23
B. +12V at PIN 9
C. +12V at PIN 6 with key-ON
4. ARE THERE ANY ERRORS? YES, go to point 5; NO, go to point 6)
5. CONSULT THE ERRORS DISPLAY TABLE
6. ABS WARNING LIGHT ACTIVATION
IS IT ACTIVATED?(YES, go to point 7; NO, go to point 8)
7. CONTACT TECHNICAL SERVICE
8. PERFORM THESE CHECKS:
A. Continuity cable between PIN 8 of the ABS control unit connector and PIN 3 of the connector «A»
of the instrument panel.
B. Check connectors - see operations described in the chapter.
If the above checks are OK, the causes can be:
C. ABS Control unit malfunction
D. Instrument panel malfunction
Modulator
N.B.
IN THE EVENT OF MALFUNCTION OF THE ABS SYSTEM, IT IS NECESSARY TO REPLACE THE
ENTIRE MODULATOR THAT IS PROVIDED FOR THE BRAKES FLUIDS NECESSARY FOR THE
OPERATION.
BRAK SYS - 232
Vespa 946 E4-E5 EMEA-USA-ASIA (2021-)