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
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Fuse block (J/B) No.1 connector M1
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Harness for open or short between ignition switch and fuse block (J/B) No.1
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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
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For 5 seconds after turning ignition switch ON
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Engine running or cranking
ON
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Except above conditions
OFF
FUEL PUMP CIRCUIT
EC-667
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EC
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”]
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For a few seconds after turning ignition switch
“ON”
[Engine is running]
0 - 1.0V
[Ignition switch “ON”]
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More than a few seconds after turning ignition
switch “ON”.
BATTERY VOLTAGE
(11 - 14V)
PBIB1122E
PBIB0040E
PBIB0185E
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