Infiniti F50. Manual - part 506

 

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Infiniti F50. Manual - part 506

 

 

START SIGNAL

EC-665

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EC

5. 

CHECK FUSE

1.

Turn ignition switch “OFF”.

2.

Disconnect 10A fuse.

3.

Check if 10A fuse is OK.

OK or NG

OK

>> GO TO 6.

NG

>> Replace 10A fuse.

6. 

CHECK START SIGNAL INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Reconnect 10A fuse.

2.

Disconnect ECM harness connector.

3.

Disconnect ignition switch harness connector.

4.

Check harness continuity between ECM terminal 59 and ignition switch terminal 5.
Refer to Wiring Diagram.

5.

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.1 connector M1

Harness for open or short between ignition switch and fuse block (J/B) No.1

Harness for open or short between ECM and fuse block (J/B) No.1

>> Repair open circuit or short to ground or short to power in harness or connectors.

8. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Continuity should exist.

EC-666

FUEL PUMP CIRCUIT

FUEL PUMP CIRCUIT

PFP:17042

Description

EBS00MOA

SYSTEM DESCRIPTION

The ECM activates the fuel pump for several seconds after the ignition switch is turned on to improve engine
startability. If the ECM receives a engine speed signal from the crankshaft position sensor (POS), it knows that
the engine is rotating, and causes the pump to operate. If the engine speed signal is not received when the
ignition switch is ON, the engine stalls. The ECM stops pump operation and prevents battery discharging,
thereby improving safety. The ECM does not directly drive the fuel pump. It controls the ON/OFF fuel pump
relay, which in turn controls the fuel pump.

COMPONENT DESCRIPTION

The fuel pump with a fuel damper is an in-tank type (the pump and
damper are located in the fuel tank).

CONSULT-II Reference Value in Data Monitor Mode

EBS00MOB

Specification data are reference values.

Sensor

Input Signal to ECM

ECM function

Actuator

Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)

Engine speed

Fuel pump control

Fuel pump relay

Ignition switch

Start signal

Condition

Fuel pump operation

Ignition switch is turned to ON.

Operates for 5 seconds.

Engine running and cranking

Operates.

When engine is stopped

Stops in 1.5 seconds.

Except as shown above

Stops.

PBIB1241E

MONITOR ITEM

CONDITION

SPECIFICATION

FUEL PUMP RLY

For 5 seconds after turning ignition switch ON

Engine running or cranking

ON

Except above conditions

OFF

FUEL PUMP CIRCUIT

EC-667

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Wiring Diagram

EBS00MOC

TBWM0174E

EC-668

FUEL PUMP CIRCUIT

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

EBS00MOD

1. 

CHECK OVERALL FUNCTION

1.

Turn ignition switch “ON”.

2.

Pinch fuel feed hose with two fingers.
Fuel pressure pulsation should be felt on the fuel feed hose
for 5 second after ignition switch is turned “ON”.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 2.

2. 

CHECK FUEL PUMP RELAY POWER SUPPLY CIRCUIT

1.

Turn ignition switch “OFF”.

2.

Disconnect fuel pump relay.

3.

Turn ignition switch “ON”.

4.

Check voltage between terminals 2, 3 and ground with CON-
SULT-II or tester.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 3.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

41

GY

Fuel pump relay

[Ignition switch “ON”]

For a few seconds after turning ignition switch 
“ON”

[Engine is running]

0 - 1.0V

[Ignition switch “ON”]

More than a few seconds after turning ignition 
switch “ON”.

BATTERY VOLTAGE
(11 - 14V)

PBIB1122E

PBIB0040E

PBIB0185E

 

 

 

 

 

 

 

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