Nissan Frontier. Instruction — part 668
P0506 ISC SYSTEM
EC-1243
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR MEXICO]
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EC
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5. Perform
EC-1074, "Accelerator Pedal Released Position Learning"
.
6. Perform
EC-1075, "Throttle Valve Closed Position Learning"
7. Perform
EC-1075, "Idle Air Volume Learning"
.
>> INSPECTION END
EC-1244
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR MEXICO]
P0507 ISC SYSTEM
P0507 ISC SYSTEM
Description
INFOID:0000000009481887
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:0000000009481888
DTC Confirmation Procedure
INFOID:0000000009481889
NOTE:
• If the target idle speed is out of the specified value, perform,
EC-1075, "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
EC-1244, "Diagnosis Procedure"
Diagnosis Procedure
INFOID:0000000009481890
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-1245
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR MEXICO]
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3.
REPLACE ECM
1. Stop engine.
2. Replace ECM.
3. Perform initialization of NVIS(NATS) system and registration of all NVIS(NATS) ignition key IDs. Refer to
SEC-7, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Requirement"
.
4. Perform
.
5. Perform
EC-1074, "Accelerator Pedal Released Position Learning"
.
6. Perform
EC-1075, "Throttle Valve Closed Position Learning"
7. Perform
EC-1075, "Idle Air Volume Learning"
.
>> INSPECTION END
EC-1246
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR MEXICO]
P0550 PSP SENSOR
P0550 PSP SENSOR
Component Description
INFOID:0000000009481891
Power steering pressure (PSP) sensor is installed to the power
steering high-pressure tube and detects a power steering load. This
sensor is a potentiometer which transforms the power steering load
into output voltage, and emits the voltage signal to the ECM. The
ECM controls the electric throttle control actuator and adjusts the
throttle valve opening angle to increase the engine speed and
adjusts the idle speed for the increased load.
On Board Diagnosis Logic
INFOID:0000000009481892
The MIL will not illuminate for this diagnosis.
NOTE:
If DTC P0550 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to
.
DTC Confirmation Procedure
INFOID:0000000009481893
1. If DTC Confirmation Procedure has been previously conducted, always perform the following before con-
ducting the next step.
a. Turn ignition switch OFF and wait at least 10 seconds.
b. Turn ignition switch ON.
c.
Turn ignition switch OFF and wait at least 10 seconds.
2. Start engine and let it idle for at least 5 seconds.
3. Check 1st trip DTC.
4. If 1st trip DTC is detected, go to
EC-1246, "Diagnosis Procedure"
Diagnosis Procedure
INFOID:0000000009481894
1.
CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body. Refer to
.
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
BBIA0552E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0550
0550
Power steering pressure
sensor circuit
An excessively low or high voltage from the
sensor is sent to ECM.
• Harness or connectors
(The sensor circuit is open or shorted)
• Power steering pressure sensor
BBIA0539E
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