Nissan Xterra. Instruction — part 306
EC-350
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
P0500 VSS
P0500 VSS
Description
INFOID:0000000009484056
NOTE:
• If DTC P0500 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX.
• If DTC P0500 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer
.
The vehicle speed signal is sent to the combination meter from the “ABS actuator and electric unit (control
unit)” by CAN communication line. The combination meter then sends a signal to the ECM by CAN communi-
cation line.
On Board Diagnosis Logic
INFOID:0000000009484057
FAIL-SAFE MODE
When the malfunction is detected, ECM enters fail-safe mode.
DTC Confirmation Procedure
INFOID:0000000009484058
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing 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:
Steps 1 and 2 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.
If NG, go to
If OK, go to following step.
3. Select “DATA MONITOR” mode with CONSULT.
4. Warm engine up to normal operating temperature.
5. Maintain the following conditions for at least 60 consecutive seconds.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0500
0500
Vehicle speed sensor
The almost 0 km/h (0 MPH) signal from
vehicle speed sensor is sent to ECM even
when vehicle is being driven.
• Harness or connectors
(The CAN communication line is open or short-
ed)
• Harness or connectors
(The vehicle speed signal circuit is open or
shorted)
• Wheel sensor
• Combination meter
• ABS actuator and electric unit (control unit)
Detected item
Engine operating condition in fail-safe mode
Vehicle speed sensor
When the fail-safe system for vehicle speed sensor is activated, the cooling fan operates
(High) while engine is running.
ENG SPEED
1,550 - 6,000 rpm (M/T)
1,700 - 6,000 rpm (A/T)
COOLAN TEMP/S
More than 70
°C (158°F)
P0500 VSS
EC-351
< DTC/CIRCUIT DIAGNOSIS >
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6. Check 1st trip DTC.
7. If 1st trip DTC is detected, go to
Overall Function Check
INFOID:0000000009484059
Use this procedure to check the overall function of the vehicle speed sensor circuit. During this check, a 1st
trip DTC might not be confirmed.
WITH GST
1. Lift up drive wheels.
2. Start engine.
3. Read vehicle speed sensor signal in Service $01 with GST.
The vehicle speed sensor on GST should be able to exceed 10 km/h (6 MPH) when rotating wheels with
suitable gear position.
4. If NG, go to
Diagnosis Procedure
INFOID:0000000009484060
1.
CHECK DTC WITH “ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)”
or
.
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace.
2.
CHECK COMBINATION METER FUNCTION
.
>> INSPECTION END
B/FUEL SCHDL
5.5 - 31.8 msec (M/T)
6.3 - 31.8 msec (A/T)
Selector lever
Neutral position (M/T)
Except P or N position (A/T)
PW/ST SIGNAL
OFF
EC-352
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
P0506 ISC SYSTEM
P0506 ISC SYSTEM
Description
INFOID:0000000009484061
NOTE:
If DTC P0506 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:0000000009484062
DTC Confirmation Procedure
INFOID:0000000009484063
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:0000000009484064
1.
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 2.
NG
>> Discover air leak location and repair.
2.
REPLACE ECM
1. Stop engine.
CAUTION:
Perform Additional Service When Replacing ECM. Refer to
EC-122, "Additional Service When
2. Replace ECM.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0506
0506
Idle speed control sys-
tem RPM lower than ex-
pected
The idle speed is less than the target idle speed
by 100 rpm or more.
• Electric throttle control actuator
• Intake air leak
P0506 ISC SYSTEM
EC-353
< DTC/CIRCUIT DIAGNOSIS >
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>> INSPECTION END
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