Infiniti F50. Manual - part 468

DTC P1220 FUEL PUMP CONTROL MODULE (FPCM)

EC-513

C

D

E

F

G

H

I

J

K

L

M

A

EC

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

C

D

E

F

G

H

I

J

K

L

M

A

EC

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