Nissan Almera Tino V10. Instruction — part 426
EC-530
[QG (WITH EURO-OBD)]
FUEL PUMP CIRCUIT
FUEL PUMP CIRCUIT
PFP:17042
Description
EBS00QTI
SYSTEM DESCRIPTION
*: The ECM determines the start signal status by the signals of engine speed and battery voltage.
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) and cam-
shaft position sensor (PHASE), 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
A turbine type design fuel pump is used in the fuel tank.
CONSULT-II Reference Value in Data Monitor Mode
EBS00QTJ
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
Battery
Battery voltage
*
Condition
Fuel pump operation
Ignition switch is turned to ON.
Operates for 1 second.
Engine running and cranking
Operates.
When engine is stopped
Stops in 1.5 seconds.
Except as shown above
Stops.
MBIB0046E
MONITOR ITEM
CONDITION
SPECIFICATION
FUEL PUMP RLY
●
For 1 seconds after turning ignition switch ON
●
Engine running or cranking
ON
●
Except above conditions
OFF
FUEL PUMP CIRCUIT
EC-531
[QG (WITH EURO-OBD)]
C
D
E
F
G
H
I
J
K
L
M
A
EC
Wiring Diagram
EBS00QTK
YEC475A
EC-532
[QG (WITH EURO-OBD)]
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
EBS00QTL
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 hose for 1
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 fuel pump relay terminals 1, 5 and
ground with CONSULT-II or tester.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 3.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
113
B/P
Fuel pump relay
[Ignition switch “ON”]
●
For 1 seconds after turning ignition switch “ON”
[Engine is running]
0 - 1.0V
[Ignition switch “ON”]
●
More than 1 seconds after turning ignition switch
“ON”.
BATTERY VOLTAGE
(11 - 14V)
MBIB0114E
MBIB1001E
Voltage: Battery voltage
MBIB0191E
FUEL PUMP CIRCUIT
EC-533
[QG (WITH EURO-OBD)]
C
D
E
F
G
H
I
J
K
L
M
A
EC
3.
DETECT MALFUNCTIONING PART
Check the following.
●
Fuse block (J/B) connector B1
●
10A fuse
●
15A fuse
●
Harness for open or short between fuel pump relay and fuse
>> 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.
Check harness continuity between fuel pump relay terminal 3
and fuel level sensor unit and fuel pump terminal 5, fuel level
sensor unit and fuel pump terminal 3 and body ground.
Refer to Wiring Diagram.
4.
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 B36, D81
●
Harness for open or short between fuel level sensor unit and fuel pump and fuel pump relay
●
Harness for open or short between fuel level sensor unit and fuel pump and body 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 113 and fuel pump relay terminal 2.
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 M12, B5 (LHD models)
●
Harness connectors M65, B42 (RHD models)
●
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.
Continuity should exist.
MBIB0115E
Continuity should exist.
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст