Infiniti F50. Manual — part 468
DTC P1220 FUEL PUMP CONTROL MODULE (FPCM)
EC-513
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DTC P1220 FUEL PUMP CONTROL MODULE (FPCM)
PFP:17001
Description
EBS00MJX
SYSTEM DESCRIPTION
This system controls the fuel pump operation. The amount of fuel flow delivered from the fuel pump is altered
between two flow rates by the FPCM operation. The FPCM determines the voltage supplied to the fuel pump
(and therefore fuel flow) according to the following conditions.
COMPONENT DESCRIPTION
The FPCM adjusts the voltage supplied to the fuel pump to control
the amount of fuel flow. When the FPCM increases the voltage sup-
plied to the fuel pump, the fuel flow is increased. When the FPCM
decreases the voltage, the fuel flow is decreased.
CONSULT-II Reference Value in Data Monitor Mode
EBS00MJY
Specification data are reference values.
On Board Diagnosis Logic
EBS00MJZ
Sensor
Input Signal to ECM
ECM function
Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)
Engine speed
Fuel pump control
Fuel pump control module
(FPCM)
Mass air flow sensor
Amount of intake air
Engine coolant temperature sensor
Engine coolant temperature
Ignition switch
Start signal
Conditions
Amount of fuel flow
Supplied voltage
●
Engine cranking
●
Engine coolant temperature is below 10
°
C (50
°
F).
●
Engine is running under heavy load and high speed conditions
high
Battery voltage
(11 - 14V)
Except the above
low
Approximately 8V
SEF387X
MONITOR ITEM
CONDITION
SPECIFICATION
FPCM
●
When cranking engine
HI
●
Idle at coolant temperature: More than 10
°
C (50
°
F)
LOW
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1220
1220
Fuel pump control module
(FPCM)
An improper voltage signal from the FPCM, which
is supplied to a point between the fuel pump and
the dropping resistor, is detected by ECM.
●
Harness or connectors
(FPCM circuit is shorted.)
●
Dropping resistor
●
FPCM
EC-514
DTC P1220 FUEL PUMP CONTROL MODULE (FPCM)
DTC Confirmation Procedure
EBS00MK0
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch “OFF” and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10.0V with igni-
tion switch “ON”.
WITH CONSULT-II
1.
Turn ignition switch “ON” and select “DATA MONITOR” mode
with CONSULT-II.
2.
Make sure that “COOLAN TEMP/S” indicates less than 70
°
C
(158
°
F). If not, cool down the engine.
3.
Start engine.
4.
Hold vehicle at the following conditions for 12 seconds.
5.
If 1st trip DTC is detected, go to
EC-517, "Diagnostic Procedure"
.
WITH GST
Follow the procedure “WITH CONSULT-II” above.
ENG SPEED
1,100 - 2,450 rpm
VHCL SPEED SE
More than 70 km/h (43 MPH)
B/FUEL SCHDL
1 - 10 msec
Selector lever
Suitable position
SEF189Y
DTC P1220 FUEL PUMP CONTROL MODULE (FPCM)
EC-515
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Wiring Diagram
EBS00MK1
TBWM0166E
EC-516
DTC P1220 FUEL PUMP CONTROL MODULE (FPCM)
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.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
25
B/R
Fuel pump control
module (FPCM)
[When cranking engine]
0 - 0.5V
[Engine is running]
●
Warm-up condition
●
Idle speed
8 - 12V
41
GY
Fuel pump relay
[Ignition switch “ON”]
●
For a few seconds after turning ignition switch
“ON”
[Engine is running]
0 - 1.0V
[Ignition switch “ON”]
●
More than a few seconds after turning ignition
switch “ON”.
BATTERY VOLTAGE
(11 - 14V)
116
G/R
Fuel pump control
module (FPCM) check
[Engine is running]
●
More than a few seconds after turning ignition
switch “ON”
Approximately 0V
[Ignition switch “ON”]
●
For a few seconds after turning ignition switch
“ON”
[Engine is running]
●
Warm-up condition
●
Idle speed
4 - 6V
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