Infiniti M45 (Y34). Manual — part 497
FUEL PUMP CIRCUIT
EC-677
C
D
E
F
G
H
I
J
K
L
M
A
EC
3.
DETECT MALFUNCTIONING PART
Check the following.
●
Fuse block (J/B) No. 1 connector M1
●
Fuse block (J/B) No. 2 connectors M143, M145
●
Joint connector-19
●
15A fuses
●
Harness for open or short between fuse and fuel pump relay
>> Repair open circuit or short to ground or short to power in harness or connectors.
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
fuel pump relay terminal 5 and “fuel level sensor unit and fuel pump” terminal 3,
“fuel level sensor unit and 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.
PBIB1127E
Continuity should exist.
PBIB1129E
EC-678
FUEL PUMP CIRCUIT
5.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors B211, M141
●
Harness connectors B62, B262
●
Fuse block (J/B) No. 2 connectors M143, M145
●
Harness for open or short between fuel pump relay and “fuel level sensor unit and fuel pump”
●
Harness for open or short between “fuel level sensor unit and 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.
6.
CHECK FUEL PUMP RELAY OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Disconnect ECM harness connector.
2.
Check harness continuity between ECM terminal 41 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
●
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-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
.
OK or NG
OK
>> GO TO 9.
NG
>> Replace dropping resistor.
9.
CHECK FUEL PUMP RELAY
Refer to
EC-679, "Component Inspection"
OK or NG
OK
>> GO TO 10.
NG
>> Replace fuel pump relay.
10.
CHECK FUEL PUMP
Refer to
EC-679, "Component Inspection"
OK or NG
OK
>> GO TO 11.
NG
>> Replace fuel pump.
Continuity should exist.
FUEL PUMP CIRCUIT
EC-679
C
D
E
F
G
H
I
J
K
L
M
A
EC
11.
CHECK INTERMITTENT INCIDENT
Refer to
EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
>> INSPECTION END
Component Inspection
ABS002U3
FUEL PUMP RELAY
Check continuity between fuel pump relay terminals 3 and 5 under
the following conditions.
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
ABS002U4
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-680
REFRIGERANT PRESSURE SENSOR
REFRIGERANT PRESSURE SENSOR
PFP:92136
Component Description
ABS002U5
The refrigerant pressure sensor is installed at the condenser of the
air conditioner system. The sensor uses an electrostatic volume
pressure transducer to convert refrigerant pressure to voltage. The
voltage signal is sent to ECM, and ECM controls cooling fan system.
PBIB1113E
PBIB2657E
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