Nissan Primera P11. Manual — part 179
MODELS WITHOUT VSS AFTER VIN - P11U0548750
1
CHECK INPUT SIGNAL CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector and combination meter harness connector.
3. Check harness continuity between ECM terminal 86 and meter terminal 4.
Refer to wiring diagram.
Continuity should exist.
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.
I
Harness connectors F104, M50
I
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.
Check Audio circuit and other linked circuit for short to ground or short to power. Refer to
EL section.
3
CHECK SPEEDOMETER FUNCTION
Make sure that speedometer functions properly.
OK or NG
OK
©
GO TO 5.
NG
©
GO TO 4.
4
DETECT MALFUNCTIONING PART
Check the following.
I
Harness for open or short between combination meter and ABS actuator and electric unit (control unit)
©
Repair harness or connectors. Check ABS actuator and electric unit (control unit) and its
circuit. Refer to EL section.
5
CHECK INTERMITTENT INCIDENT
Check combination meter internal circuit for short to ground or short to power. Refer to EL section.
Perform “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-QG-102.
©
INSPECTION END
DTC P0500 VEHICLE SPEED SENSOR (VSS)
QG16
I
18DE
Diagnostic Procedure (Cont’d)
EC-273
Description
NCEC0279
SYSTEM DESCRIPTION
NCEC0279S01
Sensor
Input Signal to ECM
ECM func-
tion
Actuator
Crankshaft position sensor (POS)
Engine speed
Idle air con-
trol
IACV-AAC valve
Engine coolant temperature sensor
Engine coolant temperature
Ignition switch
Start signal
Throttle position sensor
Throttle 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 or ABS actuator and
electric unit (control unit)
Vehicle speed
Cooling fan
Cooling fan operation
Electrical load
Electrical load signal
This system automatically controls engine idle speed to a specified
level. Idle speed is controlled through fine adjustment of the
amount of air which by-passes the throttle valve via IACV-AAC
valve. The IACV-AAC valve changes the opening of the air by-pass
passage to control the amount of auxiliary air. This valve is actu-
ated by a step motor built into the valve, which moves the valve in
the axial direction in steps corresponding to the ECM output sig-
nals. One step of IACV-AAC valve movement causes the respec-
tive opening of the air by-pass passage. (i.e. when the step
advances, the opening is enlarged.) The opening of the 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 then controls the step
position 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 opti-
mum value stored in the ECM is determined by taking into consid-
eration various engine conditions, such as during warm up,
deceleration, and engine load (air conditioner, power steering, cool-
ing fan operation and electrical load).
COMPONENT DESCRIPTION
NCEC0279S02
The IACV-AAC valve is operated by a step motor for centralized
control of auxiliary air supply. This motor has four winding phases
and is actuated by the output signals of ECM which turns ON and
OFF two windings each in sequence. Each time the IACV-AAC
valve opens or closes to change the auxiliary air quantity, the ECM
sends a pulse signal to the step motor. When no change in the
auxiliary air quantity is needed, the ECM does not issue the pulse
signal. A certain voltage signal is issued so that the valve remains
at that particular opening.
SEF937W
DTC P0505 IDLE AIR CONTROL VALVE (IACV) —
AUXILIARY AIR CONTROL (AAC) VALVE
QG16
I
18DE
Description
EC-274
CONSULT-II Reference Value in Data Monitor
Mode
NCEC0280
MONITOR ITEM
CONDITION
SPECIFICATION
IACV-AAC/V
I
Engine: After warming up
I
Air conditioner switch: OFF
I
Shift lever: “N”
I
No-load
Idle
5 - 20 steps
2,000 rpm
—
ECM Terminals and Reference Value
NCEC0281
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 ECM terminals, such as the ground.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
6
7
15
16
BR
Y/B
P
OR
IACV-AAC valve
[Engine is running]
I
Warm-up condition
I
Idle speed
0.1 - 14V
On Board Diagnosis Logic
NCEC0282
DTC No.
Malfunction is detected when ...
Check Items (Possible Cause)
P0505
0505
I
An improper voltage signal is sent to ECM through the
valve.
I
Harness or connectors
(The IACV-AAC valve circuit is open.)
I
IACV-AAC valve
DTC Confirmation Procedure
NCEC0283
NOTE:
If “DTC Confirmation Procedure” has been previously conducted,
always turn ignition switch “OFF” and wait at least 9 seconds
before conducting the next test.
If the target idle speed is out of the specified value, perform
“Idle Air Volume Learning”, EC-QG-33, before conducting
“DTC Confirmation Procedure”. For the target idle speed, refer
to “Service Data and Specifications (SDS)”, EC-QG-355.
With CONSULT-II
1)
Turn ignition switch “ON”.
2)
Select “DATA MONITOR” mode with CONSULT-II.
3)
Start engine and warm it up to normal operating temperature.
4)
Rev engine from idle to more than 2,000 rpm 20 times.
If 1st trip DTC is detected, go to “Diagnostic Procedure”, EC-
QG-277.
With GST
Follow the procedure “With CONSULT-II” above.
NEF085A
DTC P0505 IDLE AIR CONTROL VALVE (IACV) —
AUXILIARY AIR CONTROL (AAC) VALVE
QG16
I
18DE
CONSULT-II Reference Value in Data Monitor Mode
EC-275
Wiring Diagram
NCEC0284
YEC785
: Detectable line for DTC
: Non-detectable line for DTC
ECM
ECM RELAY
Refer to EL-POWER.
BATTERY
IACV-AAC
VALVE
DTC P0505 IDLE AIR CONTROL VALVE (IACV) —
AUXILIARY AIR CONTROL (AAC) VALVE
QG16
I
18DE
Wiring Diagram
EC-276
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