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System Description
NGEC0444
Sensor Input Signal to ECM
ECM func-
tion
Actuator
Camshaft position sensor Engine speed
ECM Fuel pump relay
Ignition switch Start signal
The ECM activates the fuel pump for several seconds after the ignition switch is turned on to improve engine
startability. If the ECM receives a 180° signal from the camshaft position sensor, it knows that the engine is
rotating, and causes the pump to perform. If the 180° signal is not received when the ignition switch is on, the
engine stalls. The ECM stops pump operation and prevents battery discharging, thereby improving safety. The
ECM does not directly drive the fuel pump. It controls the ON/OFF fuel pump relay, which in turn controls the
fuel pump.
Condition Fuel pump operation
Ignition switch is turned to ON. Operates for 5 seconds.
Engine running and cranking Operates.
Except as shown above Stops.
SFE425A
Component Description
NGEC0501
The fuel pump with a fuel damper is an in-tank type (the pump and
damper are located in the fuel tank).
CONSULT-II Reference Value in Data Monitor
Mode
NGEC0445
MONITOR ITEM CONDITION SPECIFICATION
FUEL PUMP RLY
쐌 Ignition switch is turned to ON (Operates for 5 seconds)
쐌 Engine running and cranking
ON
쐌 Except as shown above OFF
FUEL PUMP
KA24DE
System Description
EC-576
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