Toyota T100 1996 Service Manual page 519

Fuel Pump Control Circuit
CIRCUIT DESCRIPTION
The fuel pump is switched on (low voltage at terminal FC) when STA is on or while the NE signal is input to
the ECM.
In the diagram below, when the engine is cranked, current flows from terminal ST of the ignition switch to
the starter relay coil, the starter relay switches on and current flows to coil L1 of the circuit opening relay.
Thus the circuit opening relay switches on, power is supplied to the fuel pump and the fuel pump operates.
When the STA signal and NE signal are input to the ECM, Tr is turned ON, current flows to coil L2 of the circuit
opening relay, the relay switches on and the fuel pump operates.
While the NE signal is generated (engine running), the ECM keeps Tr ON (circuit opening relay ON) and the
fuel pump also keeps operating.
EFI
AM2
AM1
ALT
Battery
1996 TOYOTA T100 (RM449U)
DIAGNOSTICS
IGN
IG Switch
IG2
IG1
ST
Park/Neutral
Position Switch
(A/T)
Starter
Relay
Clutch
Start
Switch
(M/T)
− ENGINE (5VZ−FE)
EFI Relay
Circuit Opening Relay
Clutch Start
Cancel Switch
(M/T)
From
Crankshaft
Position
Sensor
Starter
Fuel Pump
L2
ECM
FC Tr
L1
STA
(STA Signal)
NE
(NE Signal)
DI−255
DI0VC−01
A01010