Nissan Xterra. Instruction — part 307
EC-354
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
P0507 ISC SYSTEM
P0507 ISC SYSTEM
Description
INFOID:0000000009484065
NOTE:
If DTC P0507 is displayed with other DTC, first perform the trouble diagnosis for the other DTC.
The ECM controls the engine idle speed to a specified level through the fine adjustment of the air, which is let
into the intake manifold, by operating the electric throttle control actuator. The operating of the throttle valve is
varied to allow for optimum control of the engine idling 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 the 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.).
On Board Diagnosis Logic
INFOID:0000000009484066
DTC Confirmation Procedure
INFOID:0000000009484067
NOTE:
• If the target idle speed is out of the specified value, perform,
EC-125, "Idle Air Volume Learning"
,
before conducting DTC Confirmation Procedure. For the target idle speed, refer to the
• If DTC Confirmation Procedure has been previously conducted, always perform the following before con-
ducting the next step.
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 11V at idle.
• Always perform the test at a temperature above
−10°C(14°F).
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. Start engine and run it for at least 1 minute at idle speed.
6. Check 1st trip DTC.
7. If 1st trip DTC is detected, go to
Diagnosis Procedure
INFOID:0000000009484068
1.
CHECK PCV HOSE CONNECTION
Confirm that PCV hose is connected correctly.
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace.
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.
OK or NG
OK
>> GO TO 3.
NG
>> Discover air leak location and repair.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0507
0507
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 leak
• PCV system
P0507 ISC SYSTEM
EC-355
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
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3.
REPLACE ECM
1. Stop engine.
CAUTION:
Perform Additional Service When Replacing ECM. Refer to
EC-122, "Additional Service When
2. Replace ECM.
>> INSPECTION END
EC-356
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
P050A, P050E COLD START CONTROL
P050A, P050E COLD START CONTROL
Description
INFOID:0000000009484069
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 catalyst by heating the catalyst and reduces emissions.
On Board Diagnosis Logic
INFOID:0000000009484070
NOTE:
If DTC P050A or P050E is displayed with other DTC, first perform the trouble diagnosis for other DTC.
DTC Confirmation Procedure
INFOID:0000000009484071
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 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-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 15
°C (59°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?
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.
P050A, P050E COLD START CONTROL
EC-357
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
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YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009484072
1.
PERFORM IDLE AIR VOLUME LEARNING
Perform
EC-125, "Idle Air Volume Learning"
.
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-235, "DTC Confirmation Proce-
.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Go to
for DTC P0171, P0174.
4.
PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Erase DTC.
3. Perform DTC Confirmation Procedure.
EC-356, "DTC Confirmation Procedure"
Is the 1st trip DTC P050A or P050E displayed again?
YES
>> GO TO 5.
NO
>> INSPECTION END
5.
REPLACE ECM
CAUTION:
Perform Additional Service When Replacing ECM. Refer to
EC-122, "Additional Service When Replac-
.
Replace ECM.
>> INSPECTION END
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