Infiniti Q45 (FY33). Manual — part 216
Fuel Pump Control Module (FPCM)
SYSTEM DESCRIPTION
Camshaft position sensor
E
Engine speed
ECM
E
FPCM
Mass air flow sensor
E
Amount of intake air
Engine coolant temperature
sensor
E
Engine coolant temperature
Ignition switch
E
Start signal
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 opera-
tion. The FPCM determines the voltage supplied to
the fuel pump (and therefore fuel flow) according to
the following conditions.
Conditions
Amount
of fuel
flow
Supplied voltage
I
Engine cranking
I
Within 16 seconds after
starting engine [above
100°C (212°F)]
I
Engine is running under
heavy load and high
speed conditions
high
Battery voltage
(11 - 14V)
Except the above
low
Approximately 7V
SEF387X
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
supplied 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
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
FPCM
I
Within 16 seconds after starting the engine, when engine coolant temperature is
more than 100°C (212°F)
HIGH
,
LOW
FPCM D/R VOLT
I
Within 16 seconds after starting the engine, when engine coolant temperature is
more than 100°C (212°F)
Approx. 5.0V
,
Approx. 0.4V
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P1220
EC-393
ECM TERMINALS AND REFERENCE VALUE
Specification data are reference values, and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring voltage. Doing so may result in damage to the
ECM’s transistor. Use a ground other than ECM terminals such as the body ground.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA
(DC voltage)
15
R/L
Fuel pump control module
Engine is cranking.
Approximately 0.4V
Engine is running.
Idle speed
Approximately 10V
93
G/R
Fuel pump control module
(FPCM) check
When cranking the engine
Approximately 0V
After starting the engine
Approximately 5V
ON BOARD DIAGNOSIS LOGIC
Diagnostic Trouble
Code No.
Malfunction is detected when .
Check Items
(Possible Cause)
P1220
1305
I
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.
I
Harness or connectors
(FPCM circuit is open or shorted.)
I
Dropping resistor
I
FPCM
SEF278Y
DIAGNOSTIC TROUBLE CODE CONFIRMATION
PROCEDURE
CAUTION:
Always drive at a safe speed.
NOTE:
If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DURE” has been previously conducted, always turn ignition
switch “OFF” and wait at least 5 seconds before conducting
the next test.
1) Lift up vehicle.
2) Turn ignition switch “ON” and select “DATA MONITOR”
mode with CONSULT-II.
3) Start engine (TCS switch “OFF”).
4) Shift A/T selector lever to “D” position.
5) Hold vehicle speed at 70 to 100 km/h (43 to 62 MPH)
for 12 seconds.
6) If 1st trip DTC is detected, go to “DIAGNOSTIC
PROCEDURE”, EC-396.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Follow the procedure “With CONSULT-II” above.
TROUBLE DIAGNOSIS FOR DTC P1220
Fuel Pump Control Module (FPCM) (Cont’d)
EC-394
TEC067M
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P1220
Fuel Pump Control Module (FPCM) (Cont’d)
EC-395
SEF524Y
SEF005R
SEF152T
SEF068T
DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK POWER SUPPLY.
1. Turn ignition switch “OFF”.
2. Disconnect FPCM harness connector.
3. Turn ignition switch “ON”.
4. Check voltage between terminal
q
3
and
ground with CONSULT-II or tester.
Voltage: Battery voltage
OK
E
NG
Check the following.
I
Harness connectors
F63
,
M49
I
Harness for open or
short between FPCM
and fuel pump relay
If NG, repair harness or
connectors.
CHECK GROUND CIRCUIT-I.
1. Turn ignition switch “OFF”.
2. Disconnect dropping resistor harness
connector.
3. Check harness continuity between
FPCM and dropping resistor terminal
q
2
and engine ground.
Continuity should exist.
If OK, check harness for short to power.
OK
E
NG
Check the following.
I
Harness connector
B123
If NG, repair open circuit or
short to power in harness
or connectors.
CHECK GROUND CIRCUIT-II.
1. Disconnect fuel pump harness connec-
tor.
2. Check harness continuity between fuel
pump terminal
q
3
and dropping resistor
terminal
q
1
, resistor terminal
q
1
and
FPCM terminal
q
1
.
Continuity should exist.
3. Check harness continuity between
FPCM terminal
q
1
and engine ground,
terminal
q
3
and engine ground.
Continuity should not exist.
If OK, check harness for short to power.
OK
E
NG
Repair harness or connec-
tors.
CHECK OUTPUT SIGNAL CIRCUIT.
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM
terminal
q
15
and terminal
q
4
.
Continuity should exist.
If OK, check harness for short to
ground and short to power.
OK
E
NG
Check the following.
I
Harness connectors
F63
,
M49
I
Harness connectors
M4
,
B3
I
Harness for open or
short between ECM and
FPCM
If NG, repair open circuit or
short to ground or short to
power in harness or con-
nectors.
q
A
(Go to next page.)
TROUBLE DIAGNOSIS FOR DTC P1220
Fuel Pump Control Module (FPCM) (Cont’d)
H
H
H
H
H
EC-396
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