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FUEL PUMP CIRCUIT
EC-473
[QR (WITH EURO-OBD)]
C
D
E
F
G
H
I
J
K
L
M
A
EC
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
Diagnostic Procedure BBS001KF
1. CHECK OVERALL FUNCTION
1. Turn ignition switch ON.
2. Pinch fuel feed hose with two fingers.
OK or NG
OK >> INSPECTION END
NG >> GO TO 2.
2. CHECK FUEL PUMP RELAY POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect fuel pump relay.
3. Turn ignition switch ON.
4. Check voltage between fuel pump relay terminals 1, 5 and
ground with CONSULT-II or tester.
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.
TERMI-
NAL
NO.
WIRE
COLOR
ITEM CONDITION DATA (DC Voltage)
114 B/OR Fuel pump relay
[Ignition switch: ON]
● For 1 second after turning ignition switch ON
[Engine is running]
0 - 1.0V
[Ignition switch: ON]
● More than 1 second after turning ignition
switch ON
BATTERY VOLTAGE
(11 - 14V)
Fuel pressure pulsation should be felt on the fuel hose
for 1 second after ignition switch is turned ON.
PBIB1983E
PBIB1974E
Voltage: Battery voltage
MBIB0191E
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