Nissan Qashqai J11. Manual — part 454
ECK-376
< DTC/CIRCUIT DIAGNOSIS >
[K9K]
P2688 FUEL HEATER
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Perform the trouble diagnosis for power supply circuit.
3.
CHECK FUEL HEATER RELAY CIRCUIT-1
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check the continuity between fuel heater relay harness connector and ECM harness connector.
4.
Also check harness for short to ground and to power.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace error-detected parts.
4.
CHECK FUEL HEATER RELAY CIRCUIT-2
1.
Disconnect fuel heater and water level sensor harness connector.
2.
Check the continuity between fuel heater and water level sensor harness connector and fuel heater relay
harness connector.
3.
Also check harness for short to ground and to power.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair or replace error-detected parts.
5.
CHECK FUEL HEATER RELAY
Check the fuel heater relay. Refer to
ECK-377, "Component Inspection (Fuel Heater Relay)"
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-41, "Intermittent Incident"
.
NO
>> Replace error-detected parts.
Component Inspection (Fuel Heater Relay)
INFOID:0000000010290053
1.
CHECK FUEL HEATER RELAY
1.
Turn ignition switch OFF.
2.
Remove fuel heater relay.
3.
Check continuity between fuel heater relay terminals as per the
following condition.
+
−
Continuity
Fuel heater relay
ECM
Connector
Terminal
Connector
Terminal
F164
2
F80
95
Existed
+
−
Continuity
Fuel heater and water level
sensor
Fuel heater relay
Connector
Terminal
Connector
Terminal
F191
5
F164
5
Existed
Fuel heater relay
Condition
Continuity
+
−
Terminal
3
5
12 V direct current supply
between terminals 1 and 2
Existed
No current supply
Not existed
JSBIA0671ZZ
P2688 FUEL HEATER
ECK-377
< DTC/CIRCUIT DIAGNOSIS >
[K9K]
C
D
E
F
G
H
I
J
K
L
M
A
ECK
N
P
O
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace fuel heater relay.
ECK-378
< DTC/CIRCUIT DIAGNOSIS >
[K9K]
LOW PRESSURE FUEL PUMP
LOW PRESSURE FUEL PUMP
Component Function Check
INFOID:0000000010519314
1.
CHECK FUEL PUMP FUNCTION
1.
Turn ignition switch ON.
2.
Pinch fuel feed hose with two fingers.
NOTE:
Fuel pressure pulsation should be felt on the fuel feed hose for 1 second after ignition switch is turned ON.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>>
ECK-379, "Diagnosis Procedure"
Diagnosis Procedure
INFOID:0000000010519315
1.
CHECK FPCM POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect FPCM harness connector.
3.
Turn ignition switch ON.
4.
Check the voltage between FPCM harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Perform the trouble diagnosis for power supply circuit.
2.
CHECK FPCM GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Check the continuity between FPCM harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair open circuit or short to power in harness or connectors.
3.
CHECK FPCM INPUT AND OUTPUT CIRCUIT
1.
Disconnect ECM harness connector.
2.
Check the continuity between FPCM harness connector and ECM harness connector.
3.
Also check harness for short to ground and to power.
Is the inspection result normal?
+
−
Voltage
FPCM
Connector
Terminal
B76
8
Ground
Battery voltage
+
−
Continuity
FPCM
Connector
Terminal
B76
7
Ground
Existed
+
−
Continuity
FPCM
ECM
Connector
Terminal
Connector
Terminal
B77
9
E59
13
Existed
10
11
LOW PRESSURE FUEL PUMP
ECK-379
< DTC/CIRCUIT DIAGNOSIS >
[K9K]
C
D
E
F
G
H
I
J
K
L
M
A
ECK
N
P
O
YES
>> GO TO 4.
NO
>> Repair or replace error-detected parts.
4.
CHECK FUEL PUMP CONTROL CIRCUIT
1.
Disconnect fuel level sensor unit and fuel pump (main) harness connector.
2.
Check the continuity between FPCM harness connector and fuel level sensor unit and fuel pump (main)
harness connector.
3.
Also check harness for short to ground and to power.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair or replace error-detected parts.
5.
CHECK LOW PRESSURE FUEL PUMP
ECK-380, "Component Inspection (Low Pressure Fuel Pump)"
.
Is the inspection result normal?
YES
>> Replace FPCM.
NO
>> Replace low pressure fuel pump.
Component Inspection (Low Pressure Fuel Pump)
INFOID:0000000010519316
1.
CHECK FUEL PRESSURE REGULATOR
1.
Turn ignition switch OFF.
2.
Check low fuel pressure.
Is inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
CHECK LOW PRESSURE FUEL PUMP
1.
Turn ignition switch OFF.
2.
Disconnect fuel level sensor unit and fuel pump (main).
3.
Check resistance between fuel level sensor unit and fuel pump (main) terminals as follows.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace fuel level sensor unit and fuel pump (main).
+
−
Continuity
FPCM
Fuel level sensor unit and fuel
pump (main)
Connector
Terminal
Connector
Terminal
B75
3
B94
1
Existed
4
4
5
3
6
2
+
−
Continuity
Fuel level sensor unit and
fuel pump (main)
Terminals
2
3
Existed
4
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