Nissan Pathfinder. Manual — part 507
EC-334
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P0500 VSS
NO
>> GO TO 5.
2.
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 3.
3.
CHECK VEHICLE SPEED SIGNAL
NOTE:
This procedure may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a
road test is expected to be easier, it is unnecessary to lift the vehicle.
With CONSULT
1. Start engine (VDC switch OFF).
2. Read “VHCL SPEED SE” in “DATA MONITOR” mode with CONSULT. The vehicle speed on CONSULT
should exceed 10 km/h (6 MPH) when rotating wheels with suitable gear position.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Proceed to
EC-336, "FOR MEXICO : Diagnosis Procedure"
4.
PERFORM DTC CONFIRMATION PROCEDURE
1. Select “DATA MONITOR” mode with CONSULT.
2. Warm engine up to normal operating temperature.
3. Maintain the following conditions for at least 50 consecutive seconds.
CAUTION:
Always drive vehicle at a safe speed.
4. Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Proceed to
EC-336, "FOR MEXICO : Diagnosis Procedure"
NO
>> INSPECTION END
5.
PERFORM COMPONENT FUNCTION CHECK
Perform component function check. Refer to
EC-335, "FOR MEXICO : Component Function Check"
.
Use component function check to check the overall function of the vehicle speed signal circuit. During this
check, a 1st trip DTC might not be confirmed.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Proceed to
EC-336, "FOR MEXICO : Diagnosis Procedure"
FOR MEXICO : Component Function Check
INFOID:0000000009760646
1.
PERFORM COMPONENT FUNCTION CHECK
With GST
1. Lift up drive wheels.
2. Start engine.
3. Read vehicle speed signal in Service $01 with GST.
ENG SPEED
1,400 - 6,000 rpm
COOLAN TEMP/S
More than 70
°C (158°F)
B/FUEL SCHDL
5.5 - 31.8 msec
Selector lever
Except P or N position
PW/ST SIGNAL
OFF
P0500 VSS
EC-335
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
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The vehicle speed signal on GST should be able to exceed 10 km/h (6 MPH) when rotating wheels with
suitable gear position.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Proceed to
EC-336, "FOR MEXICO : Diagnosis Procedure"
FOR MEXICO : Diagnosis Procedure
INFOID:0000000009760647
1.
CHECK THE ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace.
2.
CHECK THE COMBINATION METER
MWI-19, "CONSULT Function (METER/M&A)"
>> INSPECTION END
EC-336
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P0506 ISC SYSTEM
P0506 ISC SYSTEM
Description
INFOID:0000000009178240
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.).
DTC Logic
INFOID:0000000009178241
DTC DETECTION LOGIC
NOTE:
If DTC P0506 is displayed with other 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 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
, 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
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009178242
1.
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?
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P0506
ISC SYSTEM
(Idle air control system RPM lower
than expected)
The idle speed is less than the target idle speed
by 100 rpm or more.
• Electric throttle control actuator
• Intake air leakage
P0506 ISC SYSTEM
EC-337
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
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EC
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YES
>> Discover air leakage location and repair.
NO
>> Replace ECM. Refer to
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