Nissan Qashqai J11. Manual — part 526
EC9-260
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
P0627 FUEL PUMP
P0627 FUEL PUMP
DTC Logic
INFOID:0000000010309220
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 1 minute before conducting the next test.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Start the engine and wait at least 5 seconds.
2.
Check DTC.
Is DTC detected?
YES
>> Proceed to
EC9-260, "Diagnosis Procedure"
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010309221
1.
CHECK FUEL LEAKAGE
Visually check the fuel leakage.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace error-detected parts.
2.
CHECK FUEL PRESSURE SENSOR POWER SUPPLY
1.
Disconnect fuel pressure sensor harness connector.
2.
Turn ignition switch ON.
3.
Check the voltage between fuel pressure sensor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 3.
3.
CHECK FUEL PRESSURE SENSOR POWER SUPPLY CIRCUIT
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P0627
LOW PRES PMP REL CIRC
(Fuel pump “A” control circuit/
open)
• 1.DEF: FAULT ALERTED
VIA THE CONTROL UNIT
• 2.DEF: SIGNAL OUTSIDE
LOWER LIMIT
• 3.DEF: PARAMETER AT
MINIMUM STOP
• 4.DEF: PARAMETER AT
MAXIMUM STOP
• Low fuel pressure is excessively low.
• Low fuel pressure is excessively high.
• Harness or connectors
(Fuel pump relay circuit is open or
shorted.)
• Fuel pump relay
• Fuel pressure sensor
• FPCM
+
−
Voltage
(Approx.)
Fuel pressure sensor
Connector
Terminal
F124
3
Ground
5 V
P0627 FUEL PUMP
EC9-261
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
C
D
E
F
G
H
I
J
K
L
M
A
EC9
N
P
O
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check the continuity between fuel pressure sensor harness connector and ECM harness connector.
4.
Also check harness for short to power and short to ground.
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-41, "Intermittent Incident"
.
NO
>> Repair or replace error-detected parts.
4.
CHECK FUEL PRESSURE SENSOR CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check the continuity between fuel pressure sensor harness connector and ECM harness connector.
4.
Also check harness for short to power and short to ground.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair or replace error-detected parts.
5.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Reconnect harness connectors disconnected.
2.
Erase DTC.
3.
Disconnect fuel injector return pipes.
4.
Perform DTC confirmation procedure. Refer to
.
Is DTC detected again?
YES
>> Replace fuel pump (in fuel tank).
NO
>> Repair or replace fuel return circuit.
+
−
Continuity
Fuel pressure sensor
ECM
Connector
Terminal
Connector
Terminal
F124
3
F82
55
Existed
+
−
Continuity
Fuel pressure sensor
ECM
Connector
Terminal
Connector
Terminal
F124
1
F82
66
Existed
2
88
EC9-262
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
P062B ECM
P062B ECM
DTC Logic
INFOID:0000000010309222
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 1 minute before conducting the next test.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Start engine.
2.
Check DTC.
Is DTC detected?
YES
>>
EC9-262, "Diagnosis Procedure"
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010309223
1.
INSPECTION START
1.
Turn ignition switch ON.
2.
Erase DTC.
3.
Turn ignition switch OFF and wait for 1 minute.
4.
Turn ignition switch ON and wait at least 1 second.
5.
Perform the self-diagnosis.
Is the DTC P062B displayed again?
YES
>> GO TO 2.
NO
>> INSPECTION END
2.
REPLACE ECM
1.
Replace ECM.
2.
.
>> INSPECTION END
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P062B
COMPUTER
(Internal control module fuel
injector control performance)
• 1.DEF: —
ECM calculation function is malfunctioning.
ECM
P0638 ELECTRIC THROTTLE CONTROL ACTUATOR FUNCTION
EC9-263
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
C
D
E
F
G
H
I
J
K
L
M
A
EC9
N
P
O
P0638 ELECTRIC THROTTLE CONTROL ACTUATOR FUNCTION
DTC Logic
INFOID:0000000010309224
DTC DETECTION LOGIC
NOTE:
If DTC P0638 is displayed with DTC P0120 or P2100, first perform the trouble diagnosis for DTC P0120
or P2100. Refer to
.
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 1 minute before conducting the next test.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Turn ignition switch ON and wait at least 3 seconds.
2.
Check DTC.
Is DTC detected?
YES
>> Proceed to
EC9-263, "Diagnosis Procedure"
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010309225
1.
CHECK ECM HARNESS CONNECTOR CONNECTIONS
1.
Turn ignition switch OFF.
2.
Check ECM harness connector connection.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace error-detected parts.
2.
CHECK ELECTRIC THROTTLE CONTROL ACTUATOR HARNESS CONNECTOR CONNECTIONS
Check electric throttle control actuator harness connector connection.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace error-detected parts.
3.
CHECK ELECTRIC THROTTLE CONTROL ACTUATOR CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Check electric throttle control actuator circuit for open and short.
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P0638
INLET AIR FLAP POSITION
CTRL
(Throttle actuator control
range/performance bank 1)
• 1.DEF: NO RESPONSE
FROM THE VALVE MO-
TOR
• 2.DEF: INLET FLAP
BLOCKED CLOSED
• 3.DEF: INLET FLAP
BLOCKED OPEN
• 4.DEF: CLOSING OF AIR
INLET FLAP
• Throttle valve regulation error
• ECM detects an incorrect closed position of the
throttle valve.
• ECM detects an incorrect fully open position of
the throttle valve.
• Electric throttle control actuator
• Throttle valve stuck
• Throttle chamber clogged
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