Nissan X-Trail 32. Instruction — part 913
FUEL INJECTOR
EC-781
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
3.
Check resistance between fuel injector terminals as per the fol-
lowing.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace malfunctioning fuel injector. Refer to
.
Fuel injector
Resistance
+
-
Terminal
1
2
11.1 - 14.5
Ω
[at 10 - 60
°
C (50 - 140
°
F)]
PBIA9579J
EC-782
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
FUEL PUMP
FUEL PUMP
Description
INFOID:0000000010986490
*: 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
start ability. If the ECM receives a engine speed signal from the camshaft 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 Function Check
INFOID:0000000010986491
1.
CHECK FUEL PUMP FUNCTION
1.
Turn ignition switch ON.
2.
Pinch fuel feed hose with two fingers.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Proceed to
.
Diagnosis Procedure
INFOID:0000000010986492
1.
CHECK FUEL PUMP RELAY CONTROL SIGNAL
1.
Turn ignition switch ON.
2.
Check the voltage between ECM harness connector.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
CHECK FUEL PUMP RELAY CONTROL SIGNAL CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Disconnect IPDM E/R harness connector.
Sensor
Input signal to ECM
ECM Function
Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)
Engine speed*
Fuel pump control
Fuel pump relay
↓
Fuel pump
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.
Fuel pressure pulsation should be felt on the fuel feed
hose for 1 second after ignition switch is turned ON.
ECM
Voltage
+
-
Connector
Terminal
Connector
Terminal
F85
18
E60
128
Battery voltage should exist 1 second after
ignition switch is turn ON.
FUEL PUMP
EC-783
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
4.
Check the continuity between ECM harness connector and IPDM E/R harness connector.
5.
Also check harness for short to ground and to power.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Repair or replace error-detected parts.
3.
CHECK FUEL PUMP POWER SUPPLY
1.
Turn ignition switch OFF.
2.
Disconnect “fuel level sensor unit and fuel pump” harness connector.
3.
Turn ignition switch ON.
4.
Check the voltage between “fuel level sensor unit and fuel pump” harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> GO TO 4.
4.
CHECK FUEL PUMP POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect IPDM E/R harness connector.
3.
Check the continuity between IPDM E/R harness connector and “fuel level sensor unit and fuel pump”
harness connector.
4.
Also check harness for short to ground and to power.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Repair or replace error-detected parts.
5.
CHECK FUEL PUMP GROUND CIRCUIT
1.
Check the continuity between “fuel level sensor unit and fuel pump” and ground.
2.
Also heck harness for short to power.
Is the inspection result normal?
+
-
Continuity
ECM
IPDM E/R
Connector
Terminal
Connector
Terminal
F85
18
F72
76
Existed
+
-
Voltage
Fuel level sensor unit
and fuel pump
Connector
Terminal
B40
1
Ground
Battery voltage should exist 1 second
after ignition switch is turn ON.
+
-
Continuity
IPDM E/R
Fuel level sensor unit and
fuel pump
Connector
Terminal
Connector
Terminal
E11
24
B40
1
Existed
+
-
Continuity
Fuel level sensor unit and fuel pump
Connector
Terminal
B40
3
Ground
Existed
EC-784
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
FUEL PUMP
YES
>> GO TO 6.
NO
>> Repair or replace error-detected parts.
6.
CHECK FUEL PUMP
EC-784, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Replace “fuel level sensor unit and fuel pump”. Refer to
FL-12, "Removal and Installation"
.
7.
CHECK INTERMITTENT INCIDENT
Perform
GI-44, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> Replace IPDM E/R. Refer to
PCS-60, "Removal and Installation"
NO
>> Repair or replace harness or connectors.
Component Inspection
INFOID:0000000010986493
1.
CHECK FUEL PUMP
1.
Turn ignition switch OFF.
2.
Disconnect “fuel level sensor unit and fuel pump” harness connector.
3.
Check resistance between “fuel level sensor unit and fuel pump” terminals as follows.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace “fuel level sensor unit and fuel pump”. Refer to
FL-12, "Removal and Installation"
.
Fuel level sensor unit and fuel pump
Resistance
+
-
Terminal
1
3
0.2 - 5.0
Ω
[at 25
°
C (77
°
F)]
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст