Infiniti Q45. Manual — part 520
FUEL PUMP
EC-719
C
D
E
F
G
H
I
J
K
L
M
A
EC
4.
CHECK FUEL PUMP POWER SUPPLY AND GROUND CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect “fuel level sensor unit and fuel pump” harness con-
nector.
3.
Disconnect dropping resistor harness connector.
4.
Check harness continuity between the following;
fuel pump relay terminal 5 and fuel pump terminal 3,
fuel pump terminal 1 and dropping resistor terminal 2,
dropping resistor terminal 1 and ground.
Refer to Wiring Diagram.
5.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 6.
NG
>> GO TO 5.
5.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors B211, M141
●
Harness connectors B63, B263
●
Fuse block (J/B) No. 2 connector M143
●
Harness for open or short between fuel pump relay and fuel pump
●
Harness for open or short between fuel pump and dropping resistor
●
Harness for open or short between dropping resistor and ground
>> Repair open circuit or short to ground or short to power in harness or connectors.
PBIB1249E
Continuity should exist.
PBIB0032E
EC-720
FUEL PUMP
6.
CHECK FUEL PUMP RELAY OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Disconnect ECM harness connector.
2.
Check harness continuity between ECM terminal 113 and fuel pump relay terminal 1.
Refer to Wiring Diagram.
3.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 8.
NG
>> GO TO 7.
7.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors M135, F105
●
Fuse block (J/B) No. 2 connector M143
●
Harness for open or short between ECM and fuel pump relay
>> Repair open circuit or short to ground or short to power in harness or connectors.
8.
CHECK DROPPING RESISTOR
Refer to
EC-721, "Component Inspection"
OK or NG
OK
>> GO TO 9.
NG
>> Replace dropping resistor.
9.
CHECK FUEL PUMP RELAY
Refer to
EC-721, "Component Inspection"
OK or NG
OK
>> GO TO 10.
NG
>> Replace fuel pump relay.
10.
CHECK FUEL PUMP
Refer to
EC-721, "Component Inspection"
OK or NG
OK
>> GO TO 11.
NG
>> Replace fuel pump.
11.
CHECK INTERMITTENT INCIDENT
Refer to
EC-145, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
.
>> INSPECTION END
Continuity should exist.
FUEL PUMP
EC-721
C
D
E
F
G
H
I
J
K
L
M
A
EC
Component Inspection
NBS0027E
FUEL PUMP RELAY
Check continuity between terminals 3 and 5 under the following con-
ditions.
FUEL PUMP
1.
Disconnect “fuel level sensor unit and fuel pump” harness connector.
2.
Check resistance between “fuel level sensor unit and fuel pump”
terminals 1 and 3.
DROPPING RESISTOR
Check resistance between dropping resistor terminals 1 and 2.
Removal and Installation
NBS0027F
FUEL PUMP
Refer to
FL-3, "FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY"
Conditions
Continuity
12V direct current supply
between terminals 1 and 2
Yes
No current supply
No
PBIB0098E
Resistance: 0.2 - 5.0
Ω
[at 25
°
C (77
°
F)]
PBIB0186E
Resistance: Approximately 0.9
Ω
[at 20
°
C (68
°
F)]
PBIB0100E
EC-722
ICC BRAKE SWITCH
ICC BRAKE SWITCH
PFP:25320
Component Description
NBS0027N
When depress on the brake pedal, ICC brake switch is turned OFF
and stop lamp switch is turned ON. ECM detects the state of the
brake pedal by this input of two kinds (ON/OFF signal)
Refer to
for the ICC function.
CONSULT-II Reference Value in Data Monitor Mode
NBS0027O
Specification data are reference values.
PBIB2433E
MONITOR ITEM
CONDITION
SPECIFICATION
BRAKE SW1
(ICC brake switch)
●
Ignition switch: ON
Brake pedal: Fully released
ON
Brake pedal: Slightly depressed
OFF
BRAKE SW2
(stop lamp switch)
●
Ignition switch: ON
Brake pedal: Fully released
OFF
Brake pedal: Slightly depressed
ON
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