Infiniti QX4 (R50). Manual — part 144
SEF943Y
SEF572X
b)
Connect No. 1 ignition coil and No. 1 spark plug with suitable
high-tension wire as shown, and attach timing light clamp to
this wire.
c)
Check ignition timing.
SEF311Q
Idle Speed/Ignition Timing/Idle Mixture Ratio
Adjustment
NBEC0028
PREPARATION
NBEC0028S01
1) Make sure that the following parts are in good order.
I
Battery
I
Ignition system
I
Engine oil and coolant levels
I
Fuses
I
ECM harness connector
I
Vacuum hoses
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
BASIC SERVICE PROCEDURE
How to Check Idle Speed and Ignition Timing (Cont’d)
EC-43
I
Air intake system
(Oil filler cap, oil level gauge, etc.)
I
Fuel pressure
I
Engine compression
I
Throttle valve
I
Evaporative emission system
2) On air conditioner equipped models, checks should be carried out while the air conditioner is “OFF”.
3) On automatic transmission equipped models, when checking idle rpm, ignition timing and mixture ratio,
checks should be carried out while shift lever is in “N” position.
4) When measuring “CO” percentage, insert probe more than 40 cm (15.7 in) into tail pipe.
5) Turn off headlamps, heater blower, rear defogger.
6) Keep front wheels pointed straight ahead.
7) Make the check after the cooling fan has stopped.
BASIC SERVICE PROCEDURE
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont’d)
EC-44
Overall Inspection Sequence
NBEC0028S0101
SEC141C
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
BASIC SERVICE PROCEDURE
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont’d)
EC-45
INSPECTION PROCEDURE
=NBEC0028S02
1
INSPECTION START
1. Visually check the following:
I
Air cleaner clogging
I
Hoses and ducts for leaks
I
Electrical connectors
I
Gasket
I
Throttle valve and throttle position sensor operation
2. Start engine and warm it up until engine coolant temperature indicator points to the middle of gauge.
Ensure engine stays below 1,000 rpm.
SEF976U
3. Open engine hood and run engine at about 2,000 rpm for about 2 minutes under no-load.
SEF977U
4. Make sure that no DTC is displayed with CONSULT-II or GST.
OK or NG
OK
©
GO TO 3.
NG
©
GO TO 2.
2
REPAIR OR REPLACE
Repair or replace components as necessary according to corresponding “Diagnostic Procedure”.
©
GO TO 3.
3
CHECK TARGET IDLE SPEED
With CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Select “ENG SPEED” in “DATA MONITOR” mode with CONSULT-II.
3. Check idle speed.
750
±
50 rpm (in “P” or “N” position)
Without CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Check idle speed.
750
±
50 rpm (in “P” or “N” position)
OK or NG
OK
©
GO TO 12.
NG
©
GO TO 4.
BASIC SERVICE PROCEDURE
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont’d)
EC-46
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