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System Description
NGEC0918
Sensor Input Signal to ECM
ECM func-
tion
Actuator
Camshaft position sensor Engine speed
Fuel pump
control
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 120° signal from the camshaft position sensor, it knows that the engine is
rotating, and causes the pump to operate. If the 120° 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
When engine is stopped Stops in 1.5 seconds
Except as shown above Stops
SEF018S
Component Description
NGEC0919
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
NGEC0920
Specification data are reference values.
MONITOR ITEM CONDITION SPECIFICATION
FUEL PUMP RLY
쐌 Ignition switch is turned to ON. (Operates for 5 seconds.)
쐌 Engine running and cranking
ON
Except as shown above OFF
FUEL PUMP
VG33E
System Description
EC-1177
GI
MA
EM
LC
FE
CL
MT
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
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