Infiniti Q45. Manual - part 520

 

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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

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K

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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

 [at 25

°

C (77

°

F)]

PBIB0186E

Resistance: Approximately 0.9

 [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 

ACS-6, "DESCRIPTION"

  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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