Infiniti M35/M45 Y50. Manual — part 731
FUEL PUMP
EC-1397
[VK45DE]
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EC
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
NBS005Q4
1.
CHECK OVERALL FUNCTION
1.
Turn ignition switch ON.
2.
Pinch fuel feed hose (1) with two fingers.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 2.
2.
CHECK FUEL PUMP POWER SUPPLY CIRCUIT-I
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Turn ignition switch ON.
4.
Check voltage between ECM terminal 113 and ground with
CONSULT-II or tester.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 3.
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)
Fuel pressure pulsation should be felt on the fuel feed
hose for 1 second after ignition switch is turned ON.
PBIB2721E
Voltage: Battery voltage
PBIB1187E
EC-1398
[VK45DE]
FUEL PUMP
3.
CHECK FUEL PUMP POWER SUPPLY CIRCUIT-II
Check voltage between IPDM E/R terminal 40 and ground with
CONSULT-II or tester.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 16.
4.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors E108, M15
●
Harness for open or short between IPDM E/R and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.
CHECK CONDENSER POWER SUPPLY CIRCUIT-I
1.
Turn ignition switch OFF.
2.
Reconnect all harness connectors disconnected.
3.
Disconnect condenser harness connector.
4.
Turn ignition switch ON.
5.
Check voltage between condenser terminal 1 and ground with
CONSULT-II or tester.
OK or NG
OK
>> GO TO 9.
NG
>> GO TO 6.
6.
CHECK 15A FUSE
1.
Turn ignition switch OFF.
2.
Disconnect 15A fuse.
3.
Check 15A fuse.
OK or NG
OK
>> GO TO 7.
NG
>> Replace fuse.
Voltage: Battery voltage
PBIB1926E
Voltage:
Battery voltage should exist for 1 second
after ignition switch is turned ON.
PBIB0624E
FUEL PUMP
EC-1399
[VK45DE]
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EC
7.
CHECK CONDENSER POWER SUPPLY CIRCUIT-II
1.
Disconnect IPDM E/R harness connector E8.
2.
Check harness continuity between IPDM E/R terminal 39 and condenser terminal 1.
Refer to Wiring Diagram.
3.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 16.
NG
>> GO TO 8.
8.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors E106, B4
●
Harness connectors B65, B434
●
IPDM E/R connector E8
●
Harness for open or short between IPDM E/R and condenser
>> Repair open circuit or short to ground or short to power in harness or connectors.
9.
CHECK CONDENSER GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect dropping resistor harness connector.
3.
Check harness continuity between condenser terminal 2 and dropping resistor terminal 2.
Refer to Wiring Diagram.
4.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 11.
NG
>> GO TO 10.
10.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors B65, B434
●
Harness for open or short between condenser and dropping resistor
>> Repair open circuit or short to ground or short to power in harness or connectors.
Continuity should exist.
: Vehicle front
1.
FPCM
2.
Dropping resistor
Continuity should exist.
PBIB2708E
EC-1400
[VK45DE]
FUEL PUMP
11.
CHECK CONDENSER
Refer to
EC-1401, "Component Inspection"
OK or NG
OK
>> GO TO 12.
NG
>> Replace condenser.
12.
CHECK FUEL PUMP POWER SUPPLY CIRCUIT-III
1.
Turn ignition switch OFF.
2.
Disconnect harness connectors B65, B434.
3.
Disconnect “fuel level sensor unit and fuel pump” harness con-
nector (1).
–
Illustration shows the view with rear seat cushion and inspection
hole cover (RH) removed.
–
: Vehicle front
4.
Check harness continuity between the following;
harness connector B434 terminal 7 and “fuel level sensor unit and fuel pump” terminal 1,
“fuel level sensor unit and fuel pump” terminal 3 and harness connector B434 terminal 16,
harness connector B434 terminal 16 and dropping resistor terminal 2,
dropping resistor terminal 1 and ground.
Refer to Wiring Diagram.
OK or NG
OK
>> GO TO 14.
NG
>> GO TO 13.
13.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connector B65, B434
●
Harness for open or short between “fuel level sensor unit and fuel pump” and harness connector B434
●
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.
14.
CHECK DROPPING RESISTOR
Refer to
EC-1401, "Component Inspection"
OK or NG
OK
>> GO TO 15.
NG
>> Replace dropping resistor.
PBIB2706E
Continuity should exist.
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