Infiniti Q45. Manual — part 519
FUEL PUMP
EC-715
C
D
E
F
G
H
I
J
K
L
M
A
EC
FUEL PUMP
PFP:17042
Description
NBS0027A
SYSTEM DESCRIPTION
*: ECM determines the start signal status by the signals of engine speed and battery voltage.
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 engine speed signal from the camshaft position sensor (PHASE), it knows
that the engine is rotating, and causes the pump to operate. If the engine speed 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.
COMPONENT DESCRIPTION
The fuel pump with a fuel pressure regulator is an in-tank type (the
pump and pressure regulator are located in the fuel tank).
CONSULT-II Reference Value in Data Monitor Mode
NBS0027B
Specification data are reference values.
Sensor
Input Signal to ECM
ECM function
Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)
Engine speed*
Fuel pump control
Fuel pump relay
Battery
Battery voltage*
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.
PBIB2462E
MONITOR ITEM
CONDITION
SPECIFICATION
FUEL PUMP RLY
●
For 5 seconds after turning ignition switch: ON
●
Engine running or cranking
ON
●
Except above
OFF
EC-716
FUEL PUMP
Wiring Diagram
NBS0027C
TBWM1257E
FUEL PUMP
EC-717
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
NBS0027D
1.
CHECK OVERALL FUNCTION
1.
Turn ignition switch ON.
2.
Pinch fuel feed hose with two fingers.
Fuel pressure pulsation should be felt on the fuel feed hose
for 5 second after ignition switch is turned ON.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 2.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
38
G/R
Fuel pump control module
(FPCM) check
[When cranking engine]
Approximately 0V
[Engine is running]
●
Warm-up condition
●
Idle speed
4 - 6V
39
B/R
Fuel pump control module
(FPCM)
[When cranking engine]
0 - 0.5V
[Engine is running]
●
Warm-up condition
●
Idle speed
8 - 12V
113
GY
Fuel pump relay
[Ignition switch: ON]
●
For 5 seconds after turning ignition switch
ON
[Engine is running]
0 - 1.5V
[Ignition switch: ON]
●
More than 5 seconds after turning ignition
switch ON
BATTERY VOLTAGE
(11 - 14V)
PBIB2440E
EC-718
FUEL PUMP
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 2, 3 and
ground with CONSULT-II or tester.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 3.
3.
DETECT MALFUNCTIONING PART
Check the following.
●
Fuse block (J/B) No. 1 connector M1
●
Fuse block (J/B) No. 2 connectors M143, M145
●
15A fuses
●
Harness for open or short between fuse and fuel pump relay
>> Repair open circuit or short to ground or short to power in harness or connectors.
PBIB0040E
Voltage: Battery voltage
PBIB0185E
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