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System Description
NFEC0392
Sensor Input Signal to ECM
ECM func-
tion
Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)
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 (PHASE), 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 1 second.
Engine running and cranking Operates.
When engine is stopped Stops in 1.5 seconds.
Except as shown above Stops.
SEC088D
Component Description
NFEC0393
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
NFEC0394
Specification data are reference values.
MONITOR ITEM CONDITION SPECIFICATION
FUEL PUMP RLY
I Ignition switch is turned to ON. (Operates for 1 second.)
I Engine running and cranking
ON
Except as shown above OFF
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
FUEL PUMP
System Description
EC-713
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