Nissan Frontier D22. Instruction — part 470
DTC P0500 VSS
EC-983
[VG33E]
C
D
E
F
G
H
I
J
K
L
M
A
EC
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than the ECM terminals, such as the ground.
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnostic Procedure
UBS00DMB
1.
CHECK VEHICLE SPEED SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector and combination meter harness connector.
3.
Check harness continuity between ECM terminal 29 and combination meter terminal 2.
Refer to Wiring Diagram.
4.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 3.
NG
>> GO TO 2.
2.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors M81, F36
●
Harness for open or short between ECM and combination meter
>> Repair open circuit or short to ground or short to power in harness or connectors.
3.
CHECK SPEEDOMETER FUNCTION
Make sure that speedometer functions properly.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 4.
4.
CHECK SPEEDOMETER CIRCUIT FOR OPEN AND SHORT
Check the following.
●
Harness connectors M59, F27
●
Harness connectors F43, F201
●
Harness for open or short between combination meter and vehicle speed sensor
OK or NG
OK
>> Check combination meter and vehicle speed sensor. Refer to
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
29
G/B
Vehicle speed sensor
[Engine is running]
●
Lift up the vehicle.
●
Shift lever: 2nd (M/T), D (A/T)
●
Vehicle speed is 40 km/h (25 MPH)
2 - 3V
SEF996U
Continuity should exist.
EC-984
[VG33E]
DTC P0500 VSS
5.
CHECK INTERMITTENT INCIDENT
EC-696, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
>> INSPECTION END.
DTC P0505 ISC SYSTEM
EC-985
[VG33E]
C
D
E
F
G
H
I
J
K
L
M
A
EC
DTC P0505 ISC SYSTEM
PFP:23781
Description
UBS00DMC
SYSTEM DESCRIPTION
This system automatically controls engine idle speed to a specified level. Idle speed is controlled through fine
adjustment of the amount of air which bypasses the throttle valve via IACV-AAC valve. The IACV-AAC valve
repeats ON/OFF operation according to the signal sent from the ECM. The camshaft position sensor detects
the actual engine speed and sends a signal to the ECM. The ECM then controls the ON/OFF time of the IACV-
AAC valve so that engine speed coincides with the target value memorized in ECM. The target engine speed
is the lowest speed at which the engine can operate steadily. The optimum value stored in the ECM is deter-
mined by taking into consideration various engine conditions, such as during warm up, deceleration, and
engine load (air conditioner and power steering).
COMPONENT DESCRIPTION
IACV-AAC Valve
The IACV-AAC valve is moved by ON/OFF pulses from the ECM.
The longer the ON pulse, the greater the amount of air that will flow
through the valve. The more air that flows through the valve, the
higher the idle speed.
CONSULT-II Reference Value in Data Monitor Mode
UBS00DMD
Specification data are reference values.
Sensor
Input Signal to ECM
ECM func-
tion
Actuator
Camshaft position sensor
Engine speed
Idle air
control
IACV-AAC valve
Mass air flow sensor
Amount of intake air
Engine coolant temperature sensor
Engine coolant temperature
Ignition switch
Start signal
Throttle position sensor
Throttle position
Park/neutral position (PNP) switch
Park/neutral position
Air conditioner switch
Air conditioner operation
Power steering oil pressure switch
Power steering load signal
Battery
Battery voltage
Vehicle speed sensor
Vehicle speed
Ambient air temperature switch
Ambient air temperature
Intake air temperature sensor
Intake air temperature
SEF040E
MONITOR ITEM
CONDITION
SPECIFICATION
IACV-AAC/V
●
Engine: After warming up
●
Air conditioner switch: OFF
●
Shift lever: N (A/T), Neutral (M/T)
●
No load
Idle
10 - 20%
2,000 rpm
—
EC-986
[VG33E]
DTC P0505 ISC SYSTEM
On Board Diagnosis Logic
UBS00DME
DTC Confirmation Procedure
UBS00DMF
NOTE:
●
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait
at least 5 seconds before conducting the next test.
●
Perform PROCEDURE FOR MALFUNCTION A first. If 1st trip DTC cannot confirmed, perform PRO-
CEDURE FOR MALFUNCTION B AND C.
PROCEDURE FOR MALFUNCTION A
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10.5V with igni-
tion switch ON.
With CONSULT-II
1.
Turn ignition switch ON.
2.
Select “DATA MONITOR” mode with CONSULT-II.
3.
Wait at least 2 seconds.
4.
If 1st trip DTC is detected, go to
EC-989, "Diagnostic Procedure"
.
With GST
Follow the procedure “With CONSULT-II”.
PROCEDURE FOR MALFUNCTION B AND C
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11V at idle.
With CONSULT-II
1.
Start engine and warm it up to normal operating temperature.
2.
Turn ignition switch OFF and wait at least 5 seconds.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0505
A)
Idle speed control sys-
tem circuit
The IACV-AAC valve does not operate
properly
●
Harness or connectors
(The IACV-AAC valve circuit is open)
●
IACV-AAC valve
B)
Idle speed control sys-
tem RPM lower than
expected
The IACV-AAC valve does not operate
properly
●
Harness or connectors
(The IACV-AAC valve circuit is open)
●
IACV-AAC valve
C)
Idle speed control sys-
tem RPM higher than
expected
The IACV-AAC valve does not operate
properly
●
Harness or connectors
(The IACV-AAC valve circuit is open)
●
IACV-AAC valve
SEF058Y
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