Although it is normal for the fuel pump to be physically ignition switched, for extra safety it can be ECU
controlled.
When power is first given to the ECU it will turn on the fuel pump output for 2 seconds to prime the fuel
system. When the ECU sees the engine cranking it will turn on the fuel pump output continuously. When
the engine is stopped by turning off the ignition switch the fuel pump output will turn off immediately. If
the engine stops in the event of a crash, the fuel pump output will turn off after 2 seconds.
The fuel pump is not controlled directly by the ECU, it must be controlled through a relay.
OMEM200 Installation Manual 2v10
17
The power supply relay for the coil, can also be controlled by the fuel pump output. Though it is normal
for this to be controlled just by the ignition switch.
Fuel Pump Relay
12V from
battery
12V from
ignition switch
ECU fuel pump
blue / white
Chassis earth
Fuel Pump
85
30
86
87
+
-
To Next Page
Loading...
Need help?
General