Infiniti M35/M45 Y50. Manual — part 688

DTC P1220 FUEL PUMP CONTROL MODULE (FPCM)

EC-1225

[VK45DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

DTC P1220 FUEL PUMP CONTROL MODULE (FPCM)

PFP:17001

Description

NBS005KY

SYSTEM DESCRIPTION

*: ECM determines the start signal status by the signals of engine speed and battery voltage.

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

NBS005KZ

Specification data are reference values.

On Board Diagnosis Logic

NBS005L0

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

Battery

Battery voltage*

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

●

Engine: Cranking

HI

●

Engine: Idle

●

Engine 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-1226

[VK45DE]

DTC P1220 FUEL PUMP CONTROL MODULE (FPCM)

DTC Confirmation Procedure

NBS005L1

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 11V with ignition
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-1228, "Diagnostic Procedure"

.

WITH GST

Follow the procedure WITH CONSULT-II above.

ENG SPEED

1,375 - 3,475 rpm

VHCL SPEED SE

More than 70 km/h (43 MPH)

B/FUEL SCHDL

1.5 - 23.0 msec

Selector lever

Suitable position

SEF189Y

DTC P1220 FUEL PUMP CONTROL MODULE (FPCM)

EC-1227

[VK45DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

Wiring Diagram

NBS005L2

TBWT1498E

EC-1228

[VK45DE]

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.

Diagnostic Procedure

NBS005L3

1.

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

Loosen and retighten ground screws on the body.
Refer to

EC-864, "Ground Inspection"

.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

TER-

MINAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

38

G/B

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

GR

Fuel pump relay

[Ignition switch: ON]

●

For 1 second after turning ignition switch ON

[Engine is running]

0 - 1.5V

[Ignition switch: ON]

●

More than 1 second after turning ignition
switch ON

BATTERY VOLTAGE
(11 - 14V)

1.

Body ground M70

2.

Body ground M16

PBIB2782E