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14.2.10.4 Common faults of fuel pump
1.
The plug of fuel pump assembly is reversely connected, leading to contra-rotation of fuel pump,
failing to provide enough fuel pressure to the engine, and making the engine not work properly.
2.
Fuel pump is damaged and cannot rotate.
14.2.10.5 Precautions for fuel pump operation
1.
The fuel tank of new car has not gasoline, and fuel pipe has a a lot of air after gasoline feeding, so it
is necessary to start up the engine for many times to discharge the air in fuel pipe, and then the
engine can work normally. This is a normal phenomenon, and after then car startup will not take a
long time.
2.
Since the gasoline can cool down the fuel pump, the pump cannot be operated with little or no
gasoline, otherwise, the pump will be burn out.
14.3 Fault diagnosis method
Fault indicator is on the dashboard and marked with FI. Under normal circumstances, after turning the key on,
if the fault indicator blinks, the EFI system is powered on and can work; if the light is not lit, the EFI system is
not powered on and will not work, and it is necessary to inspect the connection between the fuse and
accumulator negative electrode. After the engine is started, the fault indicator goes out, indicating there is no
fault; on the contrary, if the engine is started and the fault indicator is still on, the EFI system doesn't work
properly and has faults which to be excluded.
There are 3 methods to detect faults.
14.3.1 The flicker of fault indicator (FI) is directly used for
diagnosis.
After it is confirmed that there is fault, turn on and off the key for three times (i.e., turn on - turn off - turn on -
turn off - turn on - turn off), and then the fault indicator will flash out a corresponding fault code. Find out
the fault as per the
List of Fault Codes
.
The fault indicator is used to find out the fault, for example, if the fault is that intake air pressure sensor is in
open circuit or signal port pin is short connected to the negative electrode of the accumulator, after three time
of turning on and off the key, the first 10 times of fault indicator flashing represents for 0, 1 time of flashing
after 1.2s represents for 1, 10 times of flashing after another 1.2s represents for 0, and 7 times of flashing after
more 1.2s, and then the fault code is P0107. In this way, except 0 is represented by 10 times of flashing, the
numbers 1 to 9 are represented by corresponding times. If there are other fault codes, such as P0201 (i.e., fuel
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