2014 NISSAN TEANA engine

EC-384
< DTC/CIRCUIT DIAGNOSIS >[QR25DE]
P0507 ISC SYSTEM
P0507 ISC SYSTEM
DescriptionINFOID:0000000009462309
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 l oad (air conditioner, power steering and cooling fan
operation, etc.).
DTC LogicINFOID:0000000009462310
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 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.
If the target idle speed is ou t of the specified value, perform EC-179, "Work Procedure"
, before con-
ducting DTC Confirmation Procedure.
TESTING CONDITION:
• Before performing the following procedure, confirm th at 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. Start engine and run it for at least 1 minute at idle speed.
4. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Proceed to EC-384, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000009462311
1.CHECK PCV HOSE CONNECTION
Confirm that PCV hose is connected correctly.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace error-detected parts.
DTC No. CONSULT screen terms
(Trouble diagnosis content) DTC detecting condition Possible cause
P0507 ISC SYSTEM
(Idle air control system 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 leak
• PCV system
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

P0507 ISC SYSTEMEC-385
< DTC/CIRCUIT DIAGNOSIS > [QR25DE]
C
D E
F
G H
I
J
K L
M A
EC
NP
O
2.CHECK INTAKE AIR LEAK
1. Start engine and let it idle.
2. Listen for an intake air leak after the mass air flow sensor.
Is intake air leak detected?
YES >> Discover air leak location and repair.
NO >> Replace ECM. Refer to EC-540, "Removal and Installation"
.
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

EC-386
< DTC/CIRCUIT DIAGNOSIS >[QR25DE]
P050A, P050B, P050E COLD START CONTROL
P050A, P050B, P050E COLD START CONTROL
DescriptionINFOID:0000000009462312
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:0000000009462313
DTC DETECTION LOGIC
NOTE:
If DTC P050A, P050B or P050E is displayed with ot her 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-1
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 15°C (59°F) and 36°C (97°F)?
YES >> GO TO 3.
NO-1 [If it is below 15 °C (59 °F)]>>Warm up the engine until the value of “COOLAN TEMP/S” reaches 15 °C
(59 °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-2
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 15 °C (59 °F) and 40 °C
(104 °F) for more than 15 seconds.
3. Check 1st trip DTC.
DTC No. CONSULT screen terms
(Trouble diagnosis content) DTC detecting condition Possible cause
P050A COLD START CONTROL
(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
P050B
COLD START CONTROL
(Cold start ignition timing perfor-
mance) ECM does not control ignition timing properly
when engine is started with pre-warming up con-
dition.
P050E COLD START CONTROL
(Cold start engine exhaust tem-
perature 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.
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

EC-388
< DTC/CIRCUIT DIAGNOSIS >[QR25DE]
P0520 EOP SENSOR
P0520 EOP SENSOR
DTC LogicINFOID:0000000009462315
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.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON and wait at least 5 seconds.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Proceed to EC-388, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000009462316
1.CHECK ENGINE OIL
1. Turn ignition switch OFF.
2. Check engine oil level and pressure. Refer to LU-9, "Inspection"
.
Is inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace error-detected parts.
2.CHECK EOP SENSOR POWER SUPPLY-1
1. Disconnect EOP sensor connector.
2. Turn ignition switch ON.
3. Check the voltage between EOP sensor harness connector terminals.
Inspection result normal?
YES >> GO TO 7.
NO >> GO TO 3.
3.CHECK EOP SENSOR POWER SUPPLY-2
Check the voltage between EOP sensor harness connector and the ground.
DTC No. CONSULT screen terms
(Trouble diagnosis content) Detecting condition Possible cause
P0520 EOP SENSOR/SWITCH
(Engine oil pressure sensor/switch
circuit) Signal voltage from the EOP sensor
remains at more than 5.02 V / less
than 0.3 V for 5 seconds or more. • Harness or connectors
(EOP sensor circuit is open or short-
ed.)
• Engine oil level abnormality
• EOP sensor
• Sensor power supply 2 circuit
EOP sensor Voltag e
(Approx.)
Connector +
−
terminal
F9 3 1 5 V
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

P0524 ENGINE OIL PRESSUREEC-391
< DTC/CIRCUIT DIAGNOSIS > [QR25DE]
C
D E
F
G H
I
J
K L
M A
EC
NP
O
P0524 ENGINE OIL PRESSURE
DTC LogicINFOID:0000000009462318
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION:
If “ EC-392, "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 1st trip DTC.
Is 1st trip DTC detected?
YES >> Proceed to EC-392, "Diagnosis Procedure".
NO >> INSPECTION END
4.CHECK ENGINE OIL LEVEL
Check engine oil pressure. Refer to LU-9, "Inspection"
.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Proceed to EC-392, "Diagnosis Procedure"
.
5.CHECK ENGINE OIL PRESSURE
With CONSULT
DTC No. CONSULT screen terms
(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

EC-392
< DTC/CIRCUIT DIAGNOSIS >[QR25DE]
P0524 ENGINE OIL PRESSURE
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-9, "Inspection"
.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Proceed to EC-392, "Diagnosis Procedure"
.
Diagnosis ProcedureINFOID:0000000009462319
1.CHECK ENGINE OIL LEVEL
1. Turn ignition switch OFF.
2. Check engine oil pressure level. Refer to LU-9, "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 pressure. Refer to LU-9, "Inspection"
.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Check oil pump. Refer to LU-14, "Inspection"
.
3.CHECK EOP SENSOR
Check EOP sensor. Refer to EC-390, "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-7, "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

P0524 ENGINE OIL PRESSUREEC-393
< DTC/CIRCUIT DIAGNOSIS > [QR25DE]
C
D E
F
G H
I
J
K L
M A
EC
NP
O
5.CHECK CAUSE OF ENGINE OIL CONSUMPTION
Check the following item.
>> Repair or replace error-detected parts.
Component InspectionINFOID:0000000009462320
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-21, "Component Parts Location"
.
Step Inspection item Equipment Standard Reference
1PCV valve EC-539, "Inspection"
2 Exhaust front tube Visual • No blocking
• No abnormal sounds —
3Oil pump Visual
• No blocking
• No abnormal sounds —
LU-14, "Inspection"
4 •Piston
•Piston pin
• Piston ring • Piston to piston pin oil clearance
• Piston ring side clearance
• Piston ring end gap EM-105, "How to Select Piston and Bearing"
5 Cylinder block
• Cylinder block top surface distortion
• Piston to cylinder bore clearance EM-96, "Inspection After Disassembly"
EOP sensor
Condition Resistance (k Ω)
+ −
Te r m i n a l
1 2
None 4 k
Ω – 10 k Ω
32 k Ω – 8 k Ω
2 14 k
Ω – 10 k Ω
31 k Ω – 3 k Ω
3 12 k
Ω – 8 k Ω
21 k Ω – 3 k Ω
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

EC-394
< DTC/CIRCUIT DIAGNOSIS >[QR25DE]
P052A, P052B INTAKE VALVE TIMING CONTROL
P052A, P052B INTAKE VALVE TIMING CONTROL
DTC LogicINFOID:0000000009462321
DTC DETECTION LOGIC
NOTE:
If DTC P052A or P052B is displayed with DTC P 0075, perform the trouble diagnosis for DTC P0075.
Refer to EC-221, "DTC Logic"
.
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
TESTING CONDITION:
Before performing the following procedure, confi rm that battery voltage is 10 V or more at idle.
With CONSULT
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.
4. Turn ignition switch ON.
5. On the CONSULT screen, select “ENGINE” >> “DATA MONITOR” >> “COOLAN TEMP/S”.
6. Check “COOLAN TEMP/S” indication value.
With GST
Follow the procedure “With CONSULT” above.
Is the value of
“COOLAN TEMP/S”−5°C (23°F) and 45°C (11 3°F)?
YES >> GO TO 2.
NO-1 [if it is below − 5 °C (23 °F)]>>Warm up the engine until the value of “COOLAN TEMP/S” indicates −5 °C
(23 °F) and 45 °C (113 °F). And then GO TO 2.
NO-2 [if it is above 45 °C (113 °F)]>>Cool the engine down to the val ue of “COOLAN TEMP/S” indicates −5 °C
(23 °F) and 45 °C (113 °F). And then GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE-I
1. Turn ignition switch OFF and wait at 10 seconds.
2. Turn ignition switch ON.
3. Set the selector lever in N range.
4. Start the engine and let it idle for 20 seconds or more.
5. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Proceed to EC-394, "Diagnosis Procedure"
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000009462322
1.INSPECTION START
DTC No.Trouble diagnosis
(Trouble diagnosis content) Detecting condition Possible cause
P052A CAMSHAFT POSITION TIM-
ING B1
(Cold start “A” camshaft posi-
tion timing over-advanced
bank 1) There is a gap between angle of target
and phase-control angle degree when
the engine is in a cold condition. • Crankshaft position sensor
• Camshaft position sensor
• Intake valve timing control solenoid valve
• Intake valve timing intermediate lock control solenoid valve
• Accumulation of debris to the signal pick-up portion of the camshaft
• Timing chain installation
• Foreign matter caught in the oil groove for in- take valve timing control
P052B CAMSHAFT POSITION TIM-
ING B1
(Cold start “A” camshaft posi-
tion timing over-retarded
bank 1)
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM