NISSAN TEANA 2014 Service Manual

P0507 ISC SYSTEMEC-871
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
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P0507 ISC SYSTEM
DescriptionINFOID:0000000009462720
The ECM controls the engine idle speed to a specified leve
l through the fine adjustment of the air, which is let
into the intake manifold, by operating the electric thrott le control actuator. The operating of the throttle valve is
varied to allow for optimum control of the engine idli ng speed. The crankshaft position sensor (POS) detects
the actual engine speed and sends a signal to the ECM.
The ECM controls the electric throttle control actuator so that the engine speed coincides with the target value
memorized in the ECM. The target engine speed is t he lowest speed at which the engine can operate steadily.
The optimum value stored in the ECM is determined by taking into consideration various engine conditions,
such as during warming up, deceleration and engine load (air conditioner, power steering and cooling fan
operation, etc.).
DTC LogicINFOID:0000000009462721
DTC DETECTION LOGIC
NOTE:
If DTC P0507 is displayed with ot her DTC, first perform the trouble diagnosis for the other DTC.
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conduc ted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
If the target idle speed is out of the specified value, perform EC-683, "Work Procedure"
, before con-
ducting DTC Confirmation Procedure.
TESTING CONDITION:
• Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.
• Always perform the test at a temperature above −10 °C(14 °F).
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON.
4. Turn ignition switch OFF and wait at least 10 seconds.
5. Restart engine and run it for at least 1 minute at idle speed.
6. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Proceed to EC-871, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000009462722
1.CHECK PCV HOSE CONNECTION
Confirm that PCV hose is connected correctly.
Is the inspection result normal?
YES >> GO TO 2.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0507 Idle speed control sys-
tem RPM higher than
expected The idle speed is more than the target idle
speed by 200 rpm or more. • Electric throttle control actuator
• Intake air leakage
• PCV system
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EC-872
< DTC/CIRCUIT DIAGNOSIS >[VQ35DE]
P0507 ISC SYSTEM
NO >> Repair or replace malfunctioning part.
2.CHECK INTAKE AIR LEAKAGE
1. Start engine and let it idle.
2. Listen for an intake air leakage after the mass air flow sensor.
Is intake air leakage detected?
YES >> Discover air leakage location and repair.
NO >> Replace ECM. Refer to EC-997, "Removal and Installation"
.
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

P050A, P050E COLD START CONTROLEC-873
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
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P050A, P050E COLD START CONTROL
DescriptionINFOID:0000000009462723
ECM controls ignition timing and engine idle speed when engine is started with pre-warming up condition.
This control promotes the activation of three way ca talyst by heating the catalyst and reduces emissions.
DTC LogicINFOID:0000000009462724
DTC DETECTION LOGIC
NOTE:
If DTC P050A, P050E is displayed with other DTC, first perform the trouble diagnosis for other DTC.
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE-I
With CONSULT
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Select “DATA MONITOR” mode with CONSULT.
4. Check the indication of “COOLAN TEMP/S”.
With GST
Follow the procedure “With CONSULT” above.
Is the value of
“COOLAN TEMP/S” between 4°C (39°F) and 36°C (97°F)?
YES >> GO TO 3.
NO-1 [If it is below 4 °C (39 °F)]>>Warm up the engine until the value of “COOLAN TEMP/S” reaches 4 °C
(39 °F) or more. Retry from step 1.
NO-2 [If it is above 36 °C (97 °F)]>>Cool engine down to less than 36 °C (97 °F). Retry from step 1.
3.PERFORM DTC CONFIRMATION PROCEDURE-II
With CONSULT
1. Set the select lever in N range.
2. Start the engine and warm up in idle with the value of “COOLAN TEMP/S” between 4°C (39 °F) and 40 °C
(104 °F) for more than 15 seconds.
3. Check 1st trip DTC.
With GST
Follow the procedure “With CONSULT” above.
Is 1st trip DTC detected?
YES >> Proceed to EC-874, "Diagnosis Procedure".
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P050A Cold start idle air control system
performance ECM does not control engine idle speed properly
when engine is started with pre-warming up con-
dition. • Lack of intake air volume
• Fuel injection system
•ECM
P050E Cold start engine exhaust temper-
ature too low The temperature of the catalyst inlet does not
rise to the proper temperature when the engine
is started with pre-warming up condition.
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EC-874
< DTC/CIRCUIT DIAGNOSIS >[VQ35DE]
P050A, P050E COLD START CONTROL
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000009462725
1.PERFORM IDLE AIR VOLUME LEARNING
Perform EC-683, "Work Procedure"
.
Is Idle Air Volume Learning carried out successfully?
YES >> GO TO 2.
NO >> Follow the instruction of Idle Air Volume Learning.
2.CHECK INTAKE SYSTEM
Check for the cause of intake air volume lacking. Refer to the following.
• Crushed intake air passage
• Intake air passage clogging
• Clogging of throttle body
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace malfunctioning part
3.CHECK FUEL INJECTION SYSTEM FUNCTION
Perform DTC Confirmation Procedure for DTC P0171, P0174. Refer to EC-787, "DTC Logic"
.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Proceed to EC-788, "Diagnosis Procedure"
for DTC P0171, P0174.
4.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Erase DTC.
3. Perform DTC Confirmation Procedure.
See EC-873, "DTC Logic"
.
Is the 1st trip DTC P050A, P050E displayed again?
YES >> Replace ECM. Refer to EC-997, "Removal and Installation".
NO >> INSPECTION END
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

P0520 EOP SENSOREC-875
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
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P0520 EOP SENSOR
DTC LogicINFOID:0000000009462726
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
>> GO TO 2.
2.CHECK ENGINE OIL LEVEL
1. Turn ignition switch OFF.
2. Check engine oil level. Refer to LU-25, "Inspection"
.
Is inspection result normal?
YES >> GO TO 3.
NO >> Check engine oil leak. Refer to LU-25, "Inspection"
.
3.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and let it idle for at least 5 seconds.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Proceed to EC-875, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000009462727
1.CHECK EOP SENSOR POWER SUPPLY-I
1. Turn ignition switch OFF.
2. Disconnect EOP sensor harness connector.
3. Turn ignition switch ON.
4. Check the voltage between EOP sensor harness connector terminals.
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 4.
DTC No. Trouble diagnosis
(Trouble diagnosis content) DTC detecting condition Possible cause
P0520 EOP SENSOR/SWITCH
(EOP sensor circuit) ECM detects the following status continuous-
ly for 5 seconds or more:
• A voltage signal transmitted from the en- gine oil pressure sensor is lower than 0.26
V.
• A voltage signal transmitted from the en- gine oil pressure sensor is higher than 4.9
V. • Harness or connectors
(EOP sensor circuit is open or short-
ed)
• EOP sensor
• Sensor power supply 2 circuit
EOP sensor Vo l ta g e
(Approx.)
Connector +
−
terminal
F87 3 1 5 V
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

EC-876
< DTC/CIRCUIT DIAGNOSIS >[VQ35DE]
P0520 EOP SENSOR
2.CHECK EOP SENSOR SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connectors.
3. Check the continuity between EOP sens or harness connector and ECM harness connector.
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace error-detected parts.
3.CHECK EOP SENSOR
Check EOP sensor. Refer to EC-877, "Component Inspection"
.
Is the inspection result normal?
YES >> Check intermittent incident. Refer to GI-43, "Intermittent Incident".
NO >> Repair or replace error-detected parts.
4.CHECK EOP SENSOR POWER SUPPLY-II
Check the voltage between EOP sensor harness connector terminal and ground.
Is the inspection result normal?
YES >> GO TO 7.
NO >> GO TO 5.
5.CHECK EOP SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connectors.
3. Check the continuity between EOP sens or harness connector and ECM harness connector.
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair or replace error-detected parts.
6.CHECK SENSOR POWER SUPPLY 2 CIRCUIT
Check sensor power supply 2 circuit. Refer to EC-981, "Diagnosis Procedure"
.
Is inspection result normal?
YES >> Perform the trouble diagnosis for power supply circuit.
NO >> Repair or replace error-detected parts.
7.CHECK EOP SENSOR GROUND CIRCUIT
+ −
Continuity
EOP sensor ECM
Connector Terminal Connector Terminal F87 2 F78 4 Existed
+ −Voltag e
(Approx.)
EOP sensor
Connector Terminal F87 3 Ground 5 V
+ −
Continuity
EOP sensor ECM
Connector Terminal Connector Terminal F87 3 E32 107 Existed
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

P0520 EOP SENSOREC-877
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
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1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between EOP sens or harness connector and ECM harness connector.
Is the inspection result normal?
YES >> GO TO 8.
NO >> Repair or replace error-detected parts.
8.CHECK ECM GROUND CIRCUIT
Check the continuity between ECM harness connector and ground.
Is the inspection result normal?
YES >> Check intermittent incident. Refer to GI-43, "Intermittent Incident".
NO >> Repair or replace error-detected parts.
Component InspectionINFOID:0000000009462728
1.CHECK EOP SENSOR
1. Turn ignition switch OFF.
2. Disconnect EOP sensor harness connector.
3. Check resistance between EOP sensor connector terminals.
Is the inspection result normal?
YES >> INSPECTION END.
NO >> Replace EOP sensor. Refer to EC-548, "ENGINE CONTROL SYSTEM : Component Parts Loca-
tion".
+−
Continuity
EOP sensor ECM
Connector Terminal Connector Terminal F87 1 E32 112 Existed
+ −Continuity
ECM
Connector Terminal
F78 12
Ground Existed
16
E32 123
124
127
128
EOP sensor ConditionResistance
(kΩ)
+
−
Te r m i n a l
1 2
None 4 – 10
32 – 8
2 1 4 – 10
31 – 3
3 12 – 8
21 – 3
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

EC-878
< DTC/CIRCUIT DIAGNOSIS >[VQ35DE]
P0524 ENGINE OIL PRESSURE
P0524 ENGINE OIL PRESSURE
DTC LogicINFOID:0000000009462729
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION:
If “ EC-879, "Diagnosis Procedure"
” is unfinished, be sure to perform Step 3 and 4.
1.PRECONDITIONING-1
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TEST CONDITION:
Before performing the following procedure, confirm that battery voltage is 11 V or more at idle.
>> GO TO 2.
2.PRECONDITIONING-2
Is
“Diagnosis Procedure” of DTC P0524 finished?
YES >> GO TO 3.
NO >> GO TO 4.
3.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and warm it up to normal operating temperature.
2. Maintain the following conditions for about 10 consecutive seconds.
NOTE:
With engine speed set around 4,000 rpm, the phenomenon can be reproduced more easily.
3. Check DTC.
Is DTC detected?
YES >> Proceed to EC-879, "Diagnosis Procedure".
NO >> INSPECTION END
4.CHECK ENGINE OIL LEVEL
Check engine oil level. Refer to LU-25, "Inspection"
.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Proceed to EC-879, "Diagnosis Procedure"
.
5.CHECK ENGINE OIL PRESSURE
With CONSULT
DTC No. Trouble diagnosis
(Trouble diagnosis content) DTC detecting condition Possible cause
P0524 ENGINE OIL PRESSURE
(Engine oil pressure too low) An EOP sensor signal voltage applied to
ECM remains lower than the specified value
continuously for 10 seconds or more when
the engine speed is 1,000 rpm or more. • Decrease in engine oil pressure
• Decrease in engine oil level
• Engine oil condition
•EOP sensor
• Engine body
Selector lever P or N position
Engine coolant temperature 70 °C (158 °F) or more
Engine speed 1,000 rpm or more
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

P0524 ENGINE OIL PRESSUREEC-879
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
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1. Turn ignition switch ON.
2. Select “DATA MONITOR” mode of “ENGINE” using CONSULT.
3. Start the engine and check that “EOP SENSOR” changes, according to engine speeds.
Without CONSULT
Check engine oil pressure. Refer to LU-25, "Inspection"
.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Proceed to EC-879, "Diagnosis Procedure"
.
Diagnosis ProcedureINFOID:0000000009462730
1.CHECK ENGINE OIL LEVEL
1. Turn ignition switch OFF.
2. Check engine oil level. Refer to LU-25, "Inspection"
.
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 4.
2.CHECK ENGINE OIL PRESSURE
With CONSULT
1. Turn ignition switch ON.
2. Select “DATA MONITOR” mode of “ENGINE” using CONSULT.
3. Start the engine and check that “EOP SENSOR” changes, according to engine speeds.
Without CONSULT
Check engine oil level. Refer to LU-25, "Inspection"
.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Check oil pump. Refer to LU-29, "Removal and Installation"
.
3.CHECK EOP SENSOR
Check EOP sensor. Refer to EC-880, "Component Inspection"
.
Is the inspection result normal?
YES >> Check intermittent incident. Refer to GI-43, "Intermittent Incident".
NO >> Repair or replace error-detected parts.
4.CHECK ENGINE OIL LEAKAGE
Check engine oil leakage. Refer to LU-23, "Lubrication Circuit"
.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair or replace error-detected parts.
Monitor item Condition Va l u e
(Approx.)
EOP SENSOR • Engine oil temperature: 80
°C (176 °F)
• Selector lever: P or N position
• Air conditioner switch: OFF
•No load Engine speed:
Idle 1,450 mV or more
Engine speed:
2,000 rpm 2,850 mV or more
Monitor item Condition Va l u e
(Approx.)
EOP SENSOR • Engine oil temperature: 80
°C (176 °F)
• Selector lever: P or N position
• Air conditioner switch: OFF
•No load Engine speed:
Idle 1,450 mV or more
Engine speed:
2,000 rpm 2,850 mV or more
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

EC-880
< DTC/CIRCUIT DIAGNOSIS >[VQ35DE]
P0524 ENGINE OIL PRESSURE
5.CHECK CAUSE OF ENGINE OIL CONSUMPTION
Check the following item.
>> Repair or replace error-detected parts.
Component InspectionINFOID:0000000009462731
1.CHECK EOP SENSOR
1. Turn ignition switch OFF.
2. Disconnect EOP sensor harness connector.
3. Check resistance between EOP sensor connector terminals.
Is the inspection result normal?
YES >> INSPECTION END.
NO >> Replace EOP sensor. Refer to EC-548, "ENGINE CONTROL SYSTEM : Component Parts Loca-
tion".
Step Inspection item Equipment Standard Reference
1PCV valve EC-996, "Work Procedure"
2 Exhaust front tube Visual • No blocking
• No abnormal sounds —
3 Oil pump LU-29, "Removal and Installation"
4•Piston
• Piston pin
• Piston ring • Piston to piston pin oil clearance
• Piston ring side clearance
• Piston ring end gap EM-224
5 Cylinder block
• Cylinder block top surface distortion
• Piston to cylinder bore clearance EM-234
EOP sensor
ConditionResistance
(kΩ)
+
−
Te r m i n a l
1 2
None 4 – 10
32 – 8
2 14 – 10
31 – 3
3 12 – 8
21 – 3
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM