Nissan Primera P11. Instruction — part 119
Idle Air Volume Learning
NCEC0541
DESCRIPTION
NCEC0541S01
“Idle Air Volume Learning” is an operation to learn the idle air vol-
ume that keeps each engine within the specific range. It must be
performed under any of the following conditions:
I
Each time IACV-AAC valve, throttle body or ECM is replaced.
I
Idle speed or ignition timing is out of specification.
PRE-CONDITIONING
NCEC0541S04
Before performing “Idle Air Volume Learning”, make sure that all of
the following conditions are satisfied.
Learning will be cancelled if any of the following conditions are
missed for even a moment.
I
Battery voltage: More than 12.9V (At idle)
I
Engine coolant temperature: 70 - 99°C (158 - 210°F)
I
PNP switch: ON
I
Electric load switch: OFF
(Air conditioner, headlamp, rear window defogger)
On vehicles equipped with daytime light systems, set lighting
switch to the 1st position to light only small lamps.
I
Cooling fan motor: Not operating
I
Steering wheel: Neutral (Straight-ahead position)
I
Vehicle speed: Stopped
I
Transmission: warmed-up (Drive vehicle for 10 minutes.)
OPERATION PROCEDURE
NCEC0541S02
With CONSULT-II
NCEC0541S0201
1.
Turn ignition switch “ON” and wait at least 1 second.
2.
Turn ignition switch “OFF” and wait at least 9 seconds.
3.
Start the engine and warm it up to normal operating tempera-
ture.
4.
Check that all items listed under the topic “PRE-CONDITION-
ING” (previously mentioned) are in good order.
SEF311Q
SEF452Y
SEF454Y
SEF455Y
BASIC SERVICE PROCEDURE
QG16
I
18DE
Idle Air Volume Learning
EC-33
5.
Turn ignition switch “OFF” and wait at least 9 seconds.
6.
Start the engine and let it to idle for at least 28 seconds.
7.
Select “IDLE AIR VOL LEARN” in “WORK SUPPORT” mode.
8.
Touch “START” and wait 20 seconds.
9.
Make sure that “CMPLT” is displayed on CONSULT-II screen.
If “INCMP” is displayed, “Idle Air Volume Learning” will not be
carried out successfully. In this case, find the cause of the
problem by referring to the NOTE below.
10. Rev up the engine two or three times. Make sure that idle
speed and ignition timing are close to or within specifications.
ITEM
SPECIFICATION
Idle speed
700 ± 50 rpm
Ignition timing
8° ± 5° BTDC
Without CONSULT-II
NCEC0541S0202
1.
Turn ignition switch “ON” and wait at least 1 second.
2.
Turn ignition switch “OFF” and wait at least 9 seconds.
3.
Start the engine and warm it up to normal operating tempera-
ture.
4.
Check that all items listed under the topic “PRE-CONDITION-
ING” (previously mentioned) are in good order.
5.
Turn ignition switch “OFF” and wait at least 9 seconds.
6.
Start the engine and let it to idle for at least 28 seconds.
7.
Disconnect throttle position sensor harness connector (brown),
then re-connect it within 5 seconds.
8.
Wait 20 seconds.
9.
Make sure that idle speed is within specifications. If not, the
result will be incomplete. In this case, find the cause of the
problem by referring to the NOTE below.
10. Rev up the engine two or three times. Make sure that idle
speed and ignition timing are within specifications.
ITEM
SPECIFICATION
Idle speed
700 ± 50 rpm
Ignition timing
8° ± 5° BTDC
NOTE:
If idle air volume learning cannot be performed successfully,
proceed as follows:
1)
Check that throttle valve is fully closed.
2)
Check PCV valve operation.
3)
Check that downstream of throttle valve is free from air
leakage.
4)
Adjust closed throttle position switch and reset memory.
(Refer to Basic Inspection, EC-QG-72.)
5)
When the above three items check out OK, engine com-
ponent parts and their installation condition are question-
able. Check and eliminate the cause of the problem.
6)
If any of the following conditions occur after the engine
has started, eliminate the cause of the problem and per-
form “Idle air volume learning” all over again:
NEF246A
Throttle body
.
Remove or install
throttle position
sensor harness
connector (brown)
IACV-AAC valve harness
connector
BASIC SERVICE PROCEDURE
QG16
I
18DE
Idle Air Volume Learning (Cont’d)
EC-34
I
Engine stalls.
I
Erroneous idle.
I
Blown fuses related to IACV-AAC valve system.
BASIC SERVICE PROCEDURE
QG16
I
18DE
Idle Air Volume Learning (Cont’d)
EC-35
Introduction
NCEC0029
The ECM has an on board diagnostic system which detects malfunctions related to engine sensors or actua-
tors. The ECM also records various emission-related diagnostic information including:
Diagnostic Trouble Code (DTC)
Mode 3 of ISO15031-5
Freeze Frame data
Mode 2 of ISO15031-5
System Readiness Test (SRT) code
Mode 1 of ISO15031-5
1st Trip Diagnostic Trouble Code (1st Trip DTC)
Mode 7 of ISO15031-5
1st Trip Freeze Frame data
Test values and Test limits
Mode 6 of ISO15031-5
Calibration ID
Mode 9 of ISO15031-5
The above information can be checked using procedures listed in the table below.
X: Applicable
—: Not applicable
DTC
1st trip DTC
Freeze Frame
data
1st trip Freeze
Frame data
SRT code
Test value
ECM*3
X
X*1
—
—
—
—
CONSULT-II*4
X
X
X
X
X
—
GST*4
X
X*2
X
—
X
X
*1: When DTC and 1st trip DTC simultaneously appear on the display, they cannot be clearly distinguished from each other.
*2: 1st trip DTCs for self-diagnoses concerning SRT items cannot be shown on the GST display.
*3: In diagnostic test mode II (Self-diagnostic results), DTC is displayed on MI. DTC uses a set of four digit numbers.
*4: In SELF-DIAGNOSTIC RESULTS mode, DTC is displayed. DTC uses “P” and a set of four digit numbers.
The malfunction indicator (MI) on the instrument panel lights up when the same malfunction is detected in two
consecutive trips (Two trip detection logic), or when the ECM enters fail-safe mode. (Refer to EC-QG-81.)
Two Trip Detection Logic
NCEC0030
When a malfunction is detected for the first time, 1st trip DTC and 1st trip Freeze Frame data are stored in
the ECM memory. The MI will not light up at this stage <1st trip>.
If the same malfunction is detected again during the next drive, the DTC and Freeze Frame data are stored
in the ECM memory, and the MI lights up. The MI lights up at the same time when the DTC is stored <2nd
trip>. The “trip” in the “Two Trip Detection Logic” means a driving mode in which self-diagnosis is performed
during vehicle operation. Specific on board diagnostic items will cause the ECM to light up or blink the MI,
and store DTC and Freeze Frame data, even in the 1st trip, as shown below.
X: Applicable
—: Not applicable
Items
MI
DTC
1st trip DTC
1st trip
2nd trip
1st trip
displaying
2nd trip
displaying
1st trip
displaying
2nd trip
displaying
Blinking
Lighting
up
Blinking
Lighting
up
Misfire (Possible three way
catalyst damage)
— DTC: P0300 - P0304
(0300 - 0304) is being
detected
X
—
—
—
—
—
X
—
Misfire (Possible three way
catalyst damage)
— DTC: P0300 - P0304
(0300 - 0304) is being
detected
—
—
X
—
—
X
—
—
Fail-safe items (Refer to
EC-QG-81.)
—
X
—
—
X*1
—
X*1
—
Except above
—
—
—
X
—
X
X
X
*1: Except “ECM”.
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
QG16
I
18DE
Introduction
EC-36
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