Fault Maintenance Diagnosis Method Of Efi System; Directly Making The Fault Lamp At Instrument Flash For Diagnosis - Benelli TNT 25 Maintenance Manual

Fault Maintenance Diagnosis Method of EFI System

Directly Making the Fault Lamp at Instrument Flash for Diagnosis

Fault lamp [A] is located on the meter panel and has a mark below it. Under normal circumstances, open the key, the
fault lamps will be on normally, indicating that the EFI system is a state with power supply, and it can work; fault lamp is
off, indicating that there is no power supply in EFI circuit, it will not work, and check should be conducted for the
connection of positive and negative electrodes of fuse and battery. After starting the engine, fault lamp goes off, indicating
that there is no fault; on the contrary, fault lamp is normally on after starting engine, indicating that EFI system is not
normal and there is a fault for troubleshooting.
In the case that a fault is confirmed, after opening and closing the key for 3 times, namely the operation of
opening---closing--- opening---closing –opening key, the fault lamp will flash the trouble code of corresponding fault. Then,
corresponding fault can be identified through trouble code table.
Of them, when using the method to read fault using fault lamp, the trouble code rule is as follows: for example, the
fault is the open circuit of manifold absolute pressure sensor or short circuit of signal terminal pin to the negative electrode
of battery, the fault lamp will flash for 10 times to represent 0, flash for 1 time to represent 1 after 1.2 seconds, flash for 10
times to represent 0 after 1.2 seconds, flash for 7 times to represent 7 after 1.2 seconds, namely P0107. It can be seen that
except that number 0 is represented by flashing for 10 times, numbers 1-9 correspond to the times of flashing. If there are
other trouble codes, such as fault P0201, there is fault in the fuel injector of cylinder 1. After flashing P0107, wait for 3.2
seconds, continue to flash P0201 trouble code; if there is no other fault, it will flash P0107 and P0201cyclically. Then,
relevant faults can be queried according to trouble code table.
When using PCHUD software, the software will report trouble code using decimal numbers. In trouble code table,
there is an one-to-one correspondence relationship between decimal numbers and previous hexadecimal numbers, and thus
corresponding faults may be found according to the correspondence relationship. For example, MULFCURR (current fault)
= 263 in the software, it corresponds to P0107 in trouble code table, namely manifold absolute pressure sensor fault.
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