Infiniti G20 (P11). Manual — part 163
16
CHECK “CO” %
1. Start engine and warm it up until engine coolant temperature indicator points to the middle of gauge.
AEC692
2. Rev engine (2,000 to 3,000 rpm) two or three times under no-load, then run engine at idle speed.
SEF978U
3. Check “CO” %.
Idle CO: Less than 11%
4.
Without CONSULT-II
After checking CO%,
a. Disconnect the resistor from terminals of engine coolant temperature sensor.
b. Connect engine coolant temperature sensor harness connector to engine coolant temperature sensor.
OK or NG
OK
©
GO TO 17.
NG
©
GO TO 18.
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BASIC SERVICE PROCEDURE
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont’d)
EC-63
17
CHECK HEATED OXYGEN SENSOR 1 (FRONT) SIGNAL
With CONSULT-II
1. Stop engine.
2. Replace heated oxygen sensor 1 (front).
3. Start engine and warm it up to normal operating temperature.
4. Run engine at approx. 2,000 rpm for approx. 2 minutes under no-load.
5. See “HO2S1 MNTR (B1)” in “DATA MONITOR” mode.
6. Maintaining engine at 2,000 rpm under no-load (engine is warmed up to normal operating temperature.), check that the
monitor fluctuates between “LEAN” and “RICH” more than 5 times during 10 seconds.
1 time: RICH
→
LEAN
→
RICH
2 times: RICH
→
LEAN
→
RICH
→
LEAN
→
RICH
Without CONSULT-II
1. Stop engine.
2. Replace heated oxygen sensor 1 (front).
3. Start engine and warm it up to normal operating temperature.
4. Run engine at approx. 2,000 rpm for approx. 2 minutes under no-load.
5. Set voltmeter probe between ECM terminal 62 and ground.
6. Make sure that voltage fluctuates between 0 - 0.3V and 0.6 - 1.0V more than 5 times during 10 seconds at 2,000 rpm.
1 time: 0 - 0.3V
→
0.6 - 1.0V
→
0 - 0.3V
2 times: 0 - 0.3V
→
0.6 - 1.0V
→
0 - 0.3V
→
0.6 - 1.0V
→
0 - 0.3V
OK or NG
OK
©
GO TO 6.
NG
©
GO TO 18.
18
DETECT MALFUNCTIONING PART
Check the following.
I
Connect heated oxygen sensor 1 (front) harness connector to heated oxygen sensor 1 (front).
I
Check fuel pressure regulator. Refer to EC-51.
I
Check mass air flow sensor and its circuit. Refer to EC-154.
I
Check injector and its circuit. Refer to EC-596.
Clean or replace if necessary.
I
Check engine coolant temperature sensor and its circuit. Refer to EC-171.
I
Check ECM function by substituting another known-good ECM.
(ECM may be the cause of a problem, but this is rarely the case.)
©
GO TO 6.
BASIC SERVICE PROCEDURE
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont’d)
EC-64
SEF452Y
Idle Air Volume Learning
NCEC0503
SEF454Y
SEF455Y
DESCRIPTION
NCEC0503S01
“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
NCEC0503S02
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 - 95°C (158 - 203°F)
I
PNP switch: ON
I
Electric load switch: OFF
(Air conditioner, headlamp, rear window defogger)
On vehicles equipped with daytime running light systems, if
the parking brake is applied beore the engine is started, the
headlamp will not be illuminated.
I
Cooling fan motor: Not operating
I
Steering wheel: Neutral (Straight-ahead position)
I
Vehicle speed: Stopped
I
Transmission: Warmed-up
For A/T models with CONSULT-II, drive vehicle until “FLUID
TEMP SE” in “DATA MONITOR” mode of “A/T” system indi-
cates less than 0.9V.
For A/T models without CONSULT-II and M/T models, drive
vehicle for 10 minutes.
OPERATION PROCEDURE
NCEC0503S03
With CONSULT-II
NCEC0503S0301
1.
Turn ignition switch “ON” and wait at least 1 second.
2.
Turn ignition switch “OFF” and wait at least 10 seconds.
3.
Start engine and warm it up to normal operating temperature.
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 10 seconds.
6.
Start the engine and let it idle for at least 15 seconds.
7.
Select “IDLE AIR VOL LEARN” in “WORK SUPPORT” mode.
8.
Touch “START” and wait 15 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 within specifications.
ITEM
SPECIFICATION
Idle speed
M/T: 800
±
50 rpm
A/T: 800
±
50 rpm (in “P” or “N” position)
Ignition timing
M/T: 15°
±
2° BTDC
A/T: 15°
±
2° BTDC (in “P” or “N” position)
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BASIC SERVICE PROCEDURE
Idle Air Volume Learning
EC-65
SEF837X
Without CONSULT-II
=NCEC0503S0302
1.
Turn ignition switch “ON” and wait at least 1 second.
2.
Turn ignition switch “OFF” and wait at least 10 seconds.
3.
Start engine and warm it up to normal operating temperature.
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 10 seconds.
6.
Start the engine and let it idle for at least 15 seconds.
7.
Disconnect throttle position sensor harness connector (brown),
then reconnect it within 5 seconds.
8.
Wait 15 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
M/T: 800
±
50 rpm
A/T: 800
±
50 rpm (in “P” or “N” position)
Ignition timing
M/T: 15°
±
2° BTDC
A/T: 15°
±
2° BTDC (in “P” or “N” position)
NOTE:
If idle air volume learning cannot be performed successfully,
proceed as follows:
1)
Check that throttle valve is fully closed.
2)
Check that downstream of throttle valve is free from air
leakage.
3)
Adjust closed throttle position switch and reset memory.
(Refer to Basic Inspection, EC-107.)
4)
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.
5)
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:
I
Engine stalls.
I
Erroneous idle.
I
Blown fuses related to the IACV-AAC valve system.
BASIC SERVICE PROCEDURE
Idle Air Volume Learning (Cont’d)
EC-66
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