Infiniti Q45 (FY33). Manual — part 249
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SEF327T
SEF617T
SEF328T
SEF067T
SEF330T
DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK OVERALL FUNCTION.
1. Turn ignition switch “ON”.
2. Pinch fuel feed hose with fingers.
Fuel pressure pulsation should be felt
on the fuel feed hose for 5 seconds
after ignition switch is turned “ON”.
NG
E
OK
INSPECTION END
CHECK POWER SUPPLY.
1. Turn ignition switch “OFF”.
2. Disconnect fuel pump relay.
3. Turn ignition switch “ON”.
4. Check voltage between terminals
q
1
,
q
3
and ground with CONSULT-II or tester.
Voltage: Battery voltage
OK
E
NG
Check the following.
I
Harness connectors
F63
,
M49
I
15A fuse
I
Harness continuity
between fuel pump relay
and ignition switch
If NG, repair harness or
connectors.
CHECK GROUND CIRCUIT.
1. Turn ignition switch “OFF”.
2. Disconnect fuel pump harness connector
and dropping resistor harness connector.
3. Check harness continuity between relay
terminal
q
5
and terminal
q
1
, FPCM ter-
minal
q
3
and terminal
q
1
, terminal
q
2
and body ground.
Continuity should exist.
If OK, check harness for short to power.
OK
E
NG
Check the following.
I
Harness connectors
B3
,
M4
I
Harness connectors
M49
,
F63
I
Harness connectors
B111
,
B26
I
Joint connector-17
I
Harness for open or short
between fuel pump relay
and fuel pump
I
Harness for open or short
between fuel pump and
dropping resistor
I
Harness for open or short
between dropping resistor
and body ground
If NG, repair open circuit or
short to power in harness
or connectors.
q
A
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMS
Fuel Pump Control (Cont’d)
H
H
H
H
EC-525
![](/vehicles/zatt/fitanyou/tushi/roreka.png)
SEF329T
SEF628U
q
A
CHECK OUTPUT SIGNAL CIRCUIT.
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM
terminal
q
42
and terminal
q
2
.
Continuity should exist.
If OK, check harness for short to ground
and short to power.
OK
E
NG
Repair harness or connec-
tor.
CHECK COMPONENT
(Fuel pump relay).
Refer to “COMPONENT INSPECTION”
below.
OK
E
NG
Replace fuel pump relay.
CHECK COMPONENT
(Fuel pump).
Refer to “COMPONENT INSPECTION”
below.
OK
E
NG
Replace fuel pump.
Perform “TROUBLE DIAGNOSIS FOR
INTERMITTENT INCIDENT”, EC-117.
INSPECTION END
SEF090M
COMPONENT INSPECTION
Fuel pump relay
Check continuity between terminals
q
3
and
q
5
.
Conditions
Continuity
12V direct current supply
between terminals
q
1
and
q
2
Yes
No current supply
No
If NG, replace relay.
SEF161T
Fuel pump
1.
Disconnect fuel pump harness connector.
2.
Check resistance between terminals
q
1
and
q
3
.
Resistance: 0.2 - 5.0
Ω
at 25°C (77°F)
If NG, replace fuel pump.
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMS
Fuel Pump Control (Cont’d)
H
H
H
H
H
EC-526
![](/vehicles/zatt/fitanyou/tushi/jund.png)
Power Steering Oil Pressure Switch
TEC078M
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMS
EC-527
![](/vehicles/zatt/fitanyou/tushi/bovou.png)
SEF071T
COMPONENT DESCRIPTION
The power steering oil pressure switch is attached to the power
steering high-pressure tube and detects a power steering load.
When a power steering load is detected, it signals the ECM. The
ECM adjusts the IACV-FICD solenoid valve to increase the idle
speed and adjust for the increased load.
CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
PW/ST SIGNAL
I
Engine: After warming up, idle the
engine
Steering wheel in neutral position
(forward direction)
OFF
The steering wheel is turned
ON
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)
100
G
Power steering oil pres-
sure switch
Engine is running.
Steering wheel is being turned.
0 - 1.5V
Engine is running.
Steering wheel is not being turned.
BATTERY VOLTAGE
(11 - 14V)
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMS
Power Steering Oil Pressure Switch (Cont’d)
EC-528
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